CN111732149B - Seawater heavy metal multichannel pretreatment device and method - Google Patents
Seawater heavy metal multichannel pretreatment device and method Download PDFInfo
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- CN111732149B CN111732149B CN202010611337.1A CN202010611337A CN111732149B CN 111732149 B CN111732149 B CN 111732149B CN 202010611337 A CN202010611337 A CN 202010611337A CN 111732149 B CN111732149 B CN 111732149B
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- C02F1/00—Treatment of water, waste water, or sewage
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- C02F1/285—Treatment of water, waste water, or sewage by sorption using synthetic organic sorbents
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- C02F1/00—Treatment of water, waste water, or sewage
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- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
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- C02F1/00—Treatment of water, waste water, or sewage
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Abstract
The invention discloses a seawater heavy metal multichannel pretreatment device and method. The seawater heavy metal multichannel pretreatment device and the seawater heavy metal multichannel pretreatment method provided by the application are simple in device assembly and low in cost; the adoption of a plurality of solid-phase extraction units can simultaneously process a plurality of seawater samples, and the seawater samples are not interfered with each other, so that the pretreatment efficiency is greatly improved; the solid phase extraction mechanism can adsorb various heavy metals, and has wide selection range; the whole device is made of nonmetal materials at the contact part of the sample and the reagent, and the sample and the reagent are conveyed in a closed pipeline, so that the pollution is extremely low; the device and the pretreatment method can be controlled by computer software to operate, consume less samples and reagents and are easy to operate.
Description
Technical Field
The invention relates to the technical field of seawater heavy metal content detection, in particular to a seawater heavy metal multichannel pretreatment device and method.
Background
Because the content of heavy metal elements in the seawater is extremely low, and the salt content of the seawater can reach 35 g kg -1 The direct measurement of the instrument has low signal, and the high salt matrix can interfere with the measurement and block the sample injection system. Therefore, how to efficiently perform enrichment and separation pretreatment on metals in a seawater sample is critical. The pretreatment methods commonly used for heavy metals in seawater at present comprise the following steps: 1) Extracting with a solvent; 2) Coprecipitation; 3) Solid phase extraction; 4) Flow injection. Wherein, the flow injection mainly automates the manual sample pretreatment method (such as solid phase extraction) which is time-consuming, tedious and easy to introduce pollution, thereby not only saving manpower and material resources and improving the precision and reproducibility of sample analysis, but alsoThe dosage of reagents and samples is greatly reduced, and the transportation and the reaction of the samples can be designed to be carried out in a closed nonmetallic pipeline and a container, so that the risk of pollution in the pretreatment and analysis processes of heavy metals is greatly reduced. After the sample is pretreated by flow injection, the obtained sample can be detected offline by a machine or the flow injection system is directly connected with a detection instrument to realize online detection. Therefore, the flow injection is widely applied to the detection of heavy metals in seawater. Through retrieval, the prior patents of a device and a method for pretreatment of the heavy metal flow injection of partial seawater exist, and partial commercial flow injection systems also appear successively, but most of the systems have one channel, so that the pretreatment efficiency is low; the invention with few two channels has complex structure and operation steps, can only treat partial traditional heavy metal elements, and has narrow selection range.
Disclosure of Invention
The invention provides a seawater heavy metal multichannel pretreatment device and method.
The invention provides the following scheme:
a seawater heavy metal multichannel pretreatment device comprises a sample injection unit, a heavy metal enrichment unit, a flow path switching unit, a heavy metal eluting unit and a sample receiving unit; the heavy metal enrichment unit comprises a plurality of groups of extraction mechanisms which can realize solid phase extraction, and the sample receiving unit comprises a plurality of eluent receiving bottles and at least one waste liquid receiving bottle, wherein the number of the eluent receiving bottles is the same as that of the plurality of groups of extraction mechanisms;
the flow path switching unit is used for switching between a first flow path state and a second flow path state;
the sample introduction unit is used for respectively supplying different seawater samples to be treated to the first ends of each group of extraction mechanisms in the first flow path state so that the seawater samples to be treated flow into the waste liquid receiving bottle after flowing through the extraction mechanisms;
and the heavy metal eluting unit is used for respectively supplying the eluent to the second ends of the extraction mechanisms in each group in the second flow path state, so that the eluent flows into the corresponding eluent receiving bottle after flowing through each group of extraction mechanisms and carrying the extracted heavy metals.
Preferably, the sample introduction unit is used for respectively supplying buffer solution to the first ends of each group of the extraction mechanisms in the first flow path state so that the buffer solution flows into the waste liquid receiving bottle after flowing through the extraction mechanisms.
Preferably, the sample injection unit comprises a first peristaltic pump and a plurality of groups of sample bottles with the same number as the extraction mechanisms; each sample bottle is connected with the first end of each extraction mechanism in a one-to-one correspondence through a pipeline passing through the first peristaltic pump.
Preferably, the extraction mechanism comprises a conical solid phase extraction column and a heavy metal selective adsorption resin filler; the small diameter end of the conical solid phase extraction column faces the first end of the extraction mechanism; the large diameter end of the tapered solid phase extraction column is oriented toward the second end of the extraction mechanism.
Preferably, the heavy metal selective adsorption resin filler comprises chelating resin and anion-cation exchange resin which can selectively adsorb heavy metals in seawater.
Preferably, the extraction mechanism comprises two groups, and the flow path switching unit comprises a two-position twelve-way solenoid valve; the two-position twelve-way electromagnetic valve comprises twelve transfusion holes which are annularly arranged; the first ends and the second ends of the extraction mechanisms are respectively connected with infusion holes at symmetrical positions, and the first ends and the second ends of the extraction mechanisms are respectively provided with two infusion holes at intervals.
Preferably, the heavy metal eluting unit comprises a second peristaltic pump and an eluent bottle, and the eluent bottle is connected with the second end of each extracting mechanism through a pipeline passing through the second peristaltic pump.
Preferably, the device further comprises a control unit, wherein the control unit is in communication connection with the sample injection unit, the flow path switching unit and the heavy metal eluting unit.
The seawater heavy metal multichannel pretreatment method uses the seawater heavy metal multichannel pretreatment device to carry out pretreatment on a plurality of seawater samples simultaneously, and the pretreatment method comprises the following steps:
activating, wherein the sampling unit absorbs buffer solution to enter the activated heavy metal enrichment unit from the first end of the extraction mechanism in a first flow path state, so that the heavy metal selective adsorption resin is in an optimal adsorption state;
sampling, wherein the sampling unit sucks each seawater sample in a first flow path state, the seawater samples enter each group of extraction mechanisms from the first end of the extraction mechanism, and each group of extraction mechanisms selectively adsorbs heavy metals in the seawater samples flowing through;
washing, namely, sucking the buffer solution by the sample injection unit in a first flow path state, and washing away impurities which are not adsorbed and remain in the heavy metal enrichment unit from the first end of the extraction mechanism;
eluting, and stopping the sample injection unit; the flow path switching unit is switched to a second flow path state in an action mode; the elution unit absorbs nitric acid with a certain concentration, the nitric acid enters the heavy metal enrichment unit from the second end of the extraction mechanism, and heavy metals absorbed by the extraction mechanism are eluted to the eluent receiving bottle.
Preferably, the eluent received by the eluent receiving bottle is used for realizing off-line detection or on-line detection; the nitric acid is a nitric acid solution with the volume concentration of 10-20%.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
according to the invention, a seawater heavy metal multichannel pretreatment device and a seawater heavy metal multichannel pretreatment method can be realized, and in one implementation mode, the device can comprise a sample injection unit, a heavy metal enrichment unit, a flow path switching unit, a heavy metal eluting unit and a sample receiving unit; the heavy metal enrichment unit comprises a plurality of groups of extraction mechanisms which can realize solid phase extraction, and the sample receiving unit comprises a plurality of eluent receiving bottles and at least one waste liquid receiving bottle, wherein the number of the eluent receiving bottles is the same as that of the plurality of groups of extraction mechanisms; the flow path switching unit is used for switching between a first flow path state and a second flow path state; the sample introduction unit is used for respectively supplying different seawater samples to be treated to the first ends of each group of extraction mechanisms in the first flow path state so that the seawater samples to be treated flow into the waste liquid receiving bottle after flowing through the extraction mechanisms; and the heavy metal eluting unit is used for respectively supplying the eluent to the second ends of the extraction mechanisms in each group in the second flow path state, so that the eluent flows into the corresponding eluent receiving bottle after flowing through each group of extraction mechanisms and carrying the extracted heavy metals. The seawater heavy metal multichannel pretreatment device and the seawater heavy metal multichannel pretreatment method provided by the application are simple in device assembly and low in cost; the adoption of a plurality of solid-phase extraction units can simultaneously process a plurality of seawater samples, and the seawater samples are not interfered with each other, so that the pretreatment efficiency is greatly improved; the solid phase extraction mechanism can adsorb various heavy metals, and has wide selection range; the whole device is made of nonmetal materials at the contact part of the sample and the reagent, and the sample and the reagent are conveyed in a closed pipeline, so that the pollution is extremely low; the device and the pretreatment method can be controlled by computer software to operate, consume less samples and reagents and are easy to operate.
Of course, it is not necessary for any one product to practice the invention to achieve all of the advantages set forth above at the same time.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a seawater heavy metal multichannel pretreatment device provided by an embodiment of the invention.
In the figure: a flow path switching unit 1, an extraction mechanism 2 (A, B), a tapered solid phase extraction column 21, an eluent receiving bottle 3 (A, B), a waste liquid receiving bottle 4, a first peristaltic pump 5, a sample bottle 6 (A, B), a second peristaltic pump 7, and an eluent bottle 8.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which are derived by a person skilled in the art based on the embodiments of the invention, fall within the scope of protection of the invention.
Examples
Referring to fig. 1, a seawater heavy metal multichannel pretreatment device provided by the embodiment of the invention, as shown in fig. 1, comprises a sample introduction unit, a heavy metal enrichment unit, a flow path switching unit 1, a heavy metal eluting unit and a sample receiving unit; the heavy metal enrichment unit comprises a plurality of groups of extraction mechanisms 2 which can realize solid phase extraction, and the sample receiving unit comprises a plurality of eluent receiving bottles 3 and at least one waste liquid receiving bottle 4, wherein the number of the eluent receiving bottles 3 is the same as that of the plurality of groups of extraction mechanisms 2; each unit can be made of nonmetal materials, so that pollution to seawater samples can be reduced.
The flow path switching unit 1 is configured to switch between a first flow path state and a second flow path state.
The sample feeding unit is used for respectively supplying different seawater samples to be treated to the first ends of each group of extraction mechanisms 2 in the first flow path state, so that the seawater samples to be treated flow into the waste liquid receiving bottle 4 after flowing through the extraction mechanisms.
The heavy metal eluting unit is used for respectively supplying eluent to the second ends of the extraction mechanisms 2 in the second flow path state, so that the eluent flows into the corresponding eluent receiving bottle 3 after flowing through each group of the extraction mechanisms 2 and carrying the extracted heavy metals.
The device that this application provided can contain multiunit extraction mechanism, can realize supplying different sea water samples and can realize that heavy metal is eluted alone for every extraction mechanism of group alone for the device can carry out simultaneous pretreatment to a plurality of sea water samples simultaneously. Thereby achieving the purpose of improving the working efficiency.
Further, the sample feeding unit may be further configured to supply buffer solution to the first ends of each set of the extraction mechanisms 2 in the first flow path state, so that the buffer solution flows into the waste liquid receiving bottle after flowing through the extraction mechanisms 2.
Further, the sample feeding unit comprises a first peristaltic pump 5 and a plurality of groups of sample bottles 6, wherein the number of the sample bottles is the same as that of the extraction mechanisms 2; each sample bottle 6 is connected to a first end of each extraction mechanism 2 by a one-to-one correspondence of tubing passing through the first peristaltic pump 5. It is contemplated that the sample vial may also be used to store buffers. The first peristaltic pump may simultaneously supply the liquid in each sample bottle individually to the first end of each extraction mechanism.
Further, the extraction mechanism 2 comprises a conical solid phase extraction column 21 and a heavy metal selective adsorption resin filler; the small diameter end of the conical solid phase extraction column 21 faces the first end of the extraction mechanism 2; the large diameter end of the tapered solid phase extraction column 21 is directed towards the second end of the extraction mechanism 2. The heavy metal selective adsorption resin filler comprises chelating resin and anion-cation exchange resin which can selectively adsorb heavy metals in seawater. When practical application, the conical solid-phase extraction column can be manufactured by the pipette tip, the application adopts the conical solid-phase extraction column with the small-diameter end positioned at the first end of the extraction mechanism, so that heavy metals in a seawater sample can be enriched at the small-diameter end of the conical solid-phase extraction column in a large quantity, and when the heavy metals are eluted by the eluent entering through the large-diameter end, the heavy metals enriched on the extraction column can be eluted by only a small amount of eluent, thereby achieving the purpose of saving the eluent.
In practical application, the device that this application provided can contain multiunit extraction mechanism, only need guarantee that the flow path switching unit can realize that the flow path state switches over can, for example can adopt every extraction mechanism's first end and second end to connect a two-position three-way valve respectively, two export of two-position three-way valve that link to each other with first end link to each other with a sample bottle and an eluent receiving bottle respectively (see infusion hole k can regard as the import of two-position three-way valve in fig. 1, infusion hole L and infusion hole j can regard as two exports of two-position three-way valve), two exports of two-position three-way valve that link to each other with the second end link to each other with eluent bottle and waste liquid receiving bottle respectively. Such a connection can realize switching between two channel states. The number of extraction mechanisms can be determined as desired. Further, in order to reduce the volume of the apparatus, the embodiment of the present application may provide that the extraction mechanism includes two groups, as shown in fig. 1, and the flow path switching unit includes a two-position twelve-way solenoid valve; the two-position twelve-way electromagnetic valve comprises twelve transfusion holes which are annularly arranged; the first ends and the second ends of the extraction mechanisms are respectively connected with infusion holes at symmetrical positions, and the first ends and the second ends of the extraction mechanisms are respectively provided with two infusion holes at intervals. The two-position twelve-way valve provided by the application can realize the switching of one valve body to two flow path states, and can effectively reduce the whole volume of equipment (due to the reduction of the number of the valve bodies). Therefore, the two-position twelve-way valve is suitable for being used when two groups of extraction mechanisms are arranged.
Further, the heavy metal eluting unit comprises a second peristaltic pump 7 and an eluent bottle 8, wherein the eluent bottle 8 is connected with the second end of each extracting mechanism 2 through a pipeline passing through the second peristaltic pump 7. The reverse flushing of each extraction unit can be realized through the second peristaltic pump, so that heavy metals enriched by the extraction mechanism are removed into the eluent receiving bottle for subsequent detection.
In order to further improve the automation degree of the device provided by the application, the embodiment of the application can further provide a control unit, wherein the control unit is in communication connection with the sample injection unit, the flow path switching unit and the heavy metal eluting unit.
The embodiment of the application can also provide a seawater heavy metal multichannel pretreatment method, which uses the seawater heavy metal multichannel pretreatment device to simultaneously pretreat a plurality of seawater samples, wherein the pretreatment method comprises the following steps:
activating, wherein the sampling unit absorbs buffer solution to enter the activated heavy metal enrichment unit from the first end of the extraction mechanism in a first flow path state, so that the heavy metal selective adsorption resin is in an optimal adsorption state; the valve position of the electromagnetic valve is kept unchanged.
Sampling, wherein the sampling unit sucks each seawater sample in a first flow path state, the seawater samples enter each group of extraction mechanisms from the first end of the extraction mechanism, and each group of extraction mechanisms selectively adsorbs heavy metals in the seawater samples flowing through; the valve position of the electromagnetic valve is kept unchanged.
Washing, namely, sucking the buffer solution by the sample injection unit in a first flow path state, and washing away impurities which are not adsorbed and remain in the heavy metal enrichment unit from the first end of the extraction mechanism; the valve position of the electromagnetic valve is kept unchanged.
Eluting, and stopping the sample injection unit; the flow path switching unit is switched to a second flow path state in an action mode; the elution unit absorbs nitric acid with a certain concentration, the nitric acid enters the heavy metal enrichment unit from the second end of the extraction mechanism, and heavy metals absorbed by the extraction mechanism are eluted to the eluent receiving bottle.
The eluent received by the eluent receiving bottle can be used for realizing off-line detection or on-line detection;
the nitric acid is nitric acid solution with volume concentration of 10-20%; the high-concentration nitric acid solution can ensure that the heavy metals enriched by the extraction mechanism are eluted under the condition of small usage amount.
Taking fig. 1 as an example, the flow path states of the steps in the method provided in the present application will be described in detail by providing two sets of extraction mechanisms and using two-position twelve-way valves as flow path switching means.
Activating, wherein the sampling unit absorbs buffer solution to enter the activated heavy metal enrichment unit from the first end of the extraction mechanism in a first flow path state, so that the heavy metal selective adsorption resin is in an optimal adsorption state; at this time, the first peristaltic pump 5 is operated to supply the buffer solution in the sample bottle to each extraction mechanism. Wherein, the flow path of the liquid circulation of the extraction mechanism 2A is a sample bottle 6A-infusion hole L-infusion hole k-extraction mechanism 2A-infusion hole e-infusion hole f-waste liquid receiving bottle 4. At this time, the flow path of the liquid flowing in the extraction mechanism 2B is a sample bottle 6B-infusion hole g-infusion hole h-extraction mechanism 2B-infusion hole B-infusion hole a-waste liquid receiving bottle 4.
Sampling, wherein the sampling unit sucks each seawater sample in a first flow path state, the seawater samples enter each group of extraction mechanisms from the first end of the extraction mechanism, and each group of extraction mechanisms selectively adsorbs heavy metals in the seawater samples flowing through; the valve position of the electromagnetic valve is kept unchanged. At this time, the first peristaltic pump 5 is operated to supply the seawater sample in the sample bottle to each extraction mechanism. Wherein, the flow path of the liquid circulation of the extraction mechanism 2A is a sample bottle 6A-infusion hole L-infusion hole k-extraction mechanism 2A-infusion hole e-infusion hole f-waste liquid receiving bottle 4. At this time, the flow path of the liquid flowing in the extraction mechanism 2B is a sample bottle 6B-infusion hole g-infusion hole h-extraction mechanism 2B-infusion hole B-infusion hole a-waste liquid receiving bottle 4.
Washing, namely, sucking the buffer solution by the sample injection unit in a first flow path state, and washing away impurities which are not adsorbed and remain in the heavy metal enrichment unit from the first end of the extraction mechanism; the valve position of the electromagnetic valve is kept unchanged. At this time, the first peristaltic pump 5 is operated to supply the buffer solution in the sample bottle to each extraction mechanism. Wherein, the flow path of the liquid circulation of the extraction mechanism 2A is a sample bottle 6A-infusion hole L-infusion hole k-extraction mechanism 2A-infusion hole e-infusion hole f-waste liquid receiving bottle 4. At this time, the flow path of the liquid flowing in the extraction mechanism 2B is a sample bottle 6B-infusion hole g-infusion hole h-extraction mechanism 2B-infusion hole B-infusion hole a-waste liquid receiving bottle 4.
Eluting, and stopping the sample injection unit; the flow path switching unit is switched to a second flow path state in an action mode; the elution unit absorbs nitric acid with a certain concentration, the nitric acid enters the heavy metal enrichment unit from the second end of the extraction mechanism, and heavy metals absorbed by the extraction mechanism are eluted to the eluent receiving bottle. At this time, the first peristaltic pump 5 is stopped, and the second peristaltic pump is started to start to operate, so that the eluent in the eluent bottle 8 is supplied to each extraction mechanism. Wherein, the flow path of the liquid circulation of the extraction mechanism 2A is an eluent bottle 8-an infusion hole d-an infusion hole e-the extraction mechanism 2A-an infusion hole k-an infusion hole j-an eluent receiving bottle 3A. At this time, the flow path of the liquid flow of the extraction mechanism 2B is an eluent bottle 8-an infusion hole c-an infusion hole B-the extraction mechanism 2B-an infusion hole h-an infusion hole i-an eluent receiving bottle 3B.
In a word, the seawater heavy metal multichannel pretreatment device and the seawater heavy metal multichannel pretreatment method provided by the application are simple in device assembly and low in cost; the adoption of a plurality of solid-phase extraction units can simultaneously process a plurality of seawater samples, and the seawater samples are not interfered with each other, so that the pretreatment efficiency is greatly improved; the solid phase extraction mechanism can adsorb various heavy metals, and has wide selection range; the whole device is made of nonmetal materials at the contact part of the sample and the reagent, and the sample and the reagent are conveyed in a closed pipeline, so that the pollution is extremely low; the device and the pretreatment method can be controlled by computer software to operate, consume less samples and reagents and are easy to operate.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The foregoing description is only of the preferred embodiments of the present invention and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.
Claims (7)
1. The seawater heavy metal multichannel pretreatment device is characterized by comprising a sample injection unit, a heavy metal enrichment unit, a flow path switching unit, a heavy metal eluting unit and a sample receiving unit; the heavy metal enrichment unit comprises a plurality of groups of extraction mechanisms which can realize solid phase extraction, and the sample receiving unit comprises a plurality of eluent receiving bottles and at least one waste liquid receiving bottle, wherein the number of the eluent receiving bottles is the same as that of the plurality of groups of extraction mechanisms;
the sample injection unit comprises a first peristaltic pump and a plurality of groups of sample bottles with the same number as the extraction mechanisms; each sample bottle is connected with the first end of each extraction mechanism in a one-to-one correspondence through a pipeline passing through the first peristaltic pump;
the flow path switching unit is used for switching between a first flow path state and a second flow path state;
the sample introduction unit is used for respectively supplying different seawater samples to be treated to the first ends of each group of extraction mechanisms in the first flow path state so that the seawater samples to be treated flow into the waste liquid receiving bottle after flowing through the extraction mechanisms; or, the buffer solution is respectively supplied to the first ends of each group of the extraction mechanisms so that the buffer solution flows into the waste liquid receiving bottle after flowing through the extraction mechanisms;
the heavy metal eluting unit is used for respectively supplying eluent to the second ends of the extraction mechanisms in each group in the second flow path state, so that the eluent flows into the corresponding eluent receiving bottle after flowing through each group of extraction mechanisms and carrying the extracted heavy metals;
the extraction mechanism comprises two groups, and the flow path switching unit comprises a two-position twelve-way solenoid valve; the two-position twelve-way electromagnetic valve comprises twelve transfusion holes which are annularly arranged; the first ends and the second ends of the extraction mechanisms are respectively connected with infusion holes at symmetrical positions, and the first ends and the second ends of the extraction mechanisms are respectively provided with two infusion holes at intervals.
2. The seawater heavy metal multichannel pretreatment apparatus of claim 1, wherein the extraction mechanism comprises a tapered solid phase extraction column and a heavy metal selective adsorption resin packing; the small diameter end of the conical solid phase extraction column faces the first end of the extraction mechanism; the large diameter end of the tapered solid phase extraction column is oriented toward the second end of the extraction mechanism.
3. The seawater heavy metal multichannel pretreatment apparatus according to claim 2, wherein the heavy metal selective adsorption resin filler comprises a chelating resin and an anion-cation exchange resin capable of selectively adsorbing heavy metals in seawater.
4. The seawater heavy metal multichannel pretreatment apparatus of claim 1, wherein the heavy metal eluting unit comprises a second peristaltic pump and an eluent bottle connected to the second end of each extraction mechanism by a conduit passing through the second peristaltic pump.
5. The seawater heavy metal multichannel pretreatment apparatus according to claim 1, further comprising a control unit, wherein the control unit is communicably connected to the sample introduction unit, the flow path switching unit, and the heavy metal eluting unit.
6. A seawater heavy metal multichannel pretreatment method, characterized in that a plurality of seawater samples are pretreated simultaneously by using the seawater heavy metal multichannel pretreatment device according to any one of claims 1 to 5, and the pretreatment method comprises the following steps:
activating, wherein the sampling unit absorbs buffer solution to enter the activated heavy metal enrichment unit from the first end of the extraction mechanism in a first flow path state, so that the heavy metal selective adsorption resin is in an optimal adsorption state;
sampling, wherein the sampling unit sucks each seawater sample in a first flow path state, the seawater samples enter each group of extraction mechanisms from the first end of the extraction mechanism, and each group of extraction mechanisms selectively adsorbs heavy metals in the seawater samples flowing through;
washing, namely, sucking the buffer solution by the sample injection unit in a first flow path state, and washing away impurities which are not adsorbed and remain in the heavy metal enrichment unit from the first end of the extraction mechanism;
eluting, and stopping the sample injection unit; the flow path switching unit is switched to a second flow path state in an action mode; the elution unit absorbs nitric acid with a certain concentration, the nitric acid enters the heavy metal enrichment unit from the second end of the extraction mechanism, and heavy metals absorbed by the extraction mechanism are eluted to the eluent receiving bottle.
7. The seawater heavy metal multichannel pretreatment method as recited in claim 6, wherein the eluent received by the eluent receiving bottle is used for realizing off-line detection or on-line detection, and the nitric acid is a nitric acid solution with the volume concentration of 10-20%.
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