CN105092314B - Apparatus for headspace collection and method of using the same - Google Patents
Apparatus for headspace collection and method of using the same Download PDFInfo
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- CN105092314B CN105092314B CN201410222849.3A CN201410222849A CN105092314B CN 105092314 B CN105092314 B CN 105092314B CN 201410222849 A CN201410222849 A CN 201410222849A CN 105092314 B CN105092314 B CN 105092314B
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Abstract
The invention provides a device for collecting headspace air, which comprises a container, a seal cover detachably connected with the container, an air port and a liquid port which are arranged on the seal cover and can be communicated with the inside and the outside of the container, an air port seal cover and a liquid port seal cover which are detachably connected with the air port and the liquid port respectively, an air port sealing gasket arranged between the air port and the air port sealing cover and a liquid port sealing gasket arranged between the liquid port and the liquid port sealing cover, wherein a first groove is arranged on the opening end surface of the container along the circumferential direction, a second groove is arranged on the opening end surface of the sealing cover along the circumferential direction, the wall defining the second groove is received in the first groove, the wall defining the first groove is received in the second groove, sealing rings are disposed in both the first groove and the second groove, the wall of the second groove corresponding to the first groove is set to be in sealing contact with the sealing ring of the first groove, and the wall of the first groove corresponding to the second groove is set to be in sealing contact with the sealing ring of the second groove. The invention also provides a method for using the device.
Description
Technical Field
The invention relates to the fields of oil and gas geochemical exploration and environmental investigation, in particular to a device for collecting headspace gas and a method for using the device.
Background
In geochemical exploration, the collection technology of headspace gas is mainly characterized in that a sample is filled into a container, a certain space is reserved for sealed storage, weakly adsorbed gas on the surface of solid (liquid) particles is released into the container through natural desorption, and gas in the container is detected after the gas in the headspace is balanced with the weakly adsorbed gas on the surface of the solid (liquid) particles.
At present, a glass saline bottle or a sealed cylinder is commonly used for preserving a headspace sample, but some glass saline bottles or sealed cylinders are often discovered to be air-leaked in the test analysis process, and even the glass saline bottles are damaged in transportation. The distortion of these samples due to breakage and air leakage causes large errors in geological interpretation, thereby affecting the quality of analysis.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a device for collecting headspace gas, which has the advantages of simple structure, good sealing effect and convenience in use. The invention also relates to a method for using such a device.
According to one aspect of the present invention, there is provided a device for headspace gas collection, comprising a container, a closure detachably connectable to the container, a gas port and a liquid port provided in the closure to communicate the inside and outside of the container, a gas port closure and a liquid port closure detachably connectable to the gas port and the liquid port, respectively, an air port sealing gasket arranged between the air port and the air port sealing cover and a liquid port sealing gasket arranged between the liquid port and the liquid port sealing cover, wherein a first groove is arranged on the opening end surface of the container along the circumferential direction, a second groove is arranged on the opening end surface of the sealing cover along the circumferential direction, the wall defining the second groove is received in the first groove, the wall defining the first groove is received in the second groove, sealing rings are disposed in both the first groove and the second groove, the wall of the second groove corresponding to the first groove is set to be in sealing contact with the sealing ring of the first groove, and the wall of the first groove corresponding to the second groove is set to be in sealing contact with the sealing ring of the second groove.
Therefore, after the soil sample is placed into the device, the sealing cover is covered on the container, the sealing ring of the first groove of the container is matched with the wall of the second groove of the corresponding sealing cover, and meanwhile, the sealing ring of the second groove of the sealing cover is matched with the wall of the first groove of the corresponding container, so that two seals are formed, the sealing effect is enhanced, and the air leakage phenomenon is avoided.
In one embodiment, the ratio of the width of the first groove to the wall width of the corresponding second groove is 1.05-2, and/or the ratio of the width of the second groove to the wall width of the corresponding first groove is 1.05-2. Through the arrangement, the wall of the first groove and the corresponding wall of the second groove are in clearance fit, and/or the wall of the second groove and the corresponding wall of the first groove are in clearance fit, so that the sealing cover and the container are conveniently mounted together, and quick mounting is realized. Simultaneously, through the setting, the wall of the second groove can have reasonable contact area with the sealing ring of the first groove, and/or the wall of the first groove can have reasonable contact area with the sealing ring of the second groove, so that pressure balance is ensured, and better sealing is facilitated. And the wall width of the first groove and/or the self strength of the wall width of the second groove are ensured through the arrangement, and the manufacture is convenient.
In one embodiment, the depth of the first groove and/or the depth of the second groove is 3 to 20 mm. By this arrangement the cooperation of the first groove with the wall of the second groove and/or the cooperation of the second groove with the wall of the first groove is ensured, thereby ensuring a sealing effect. Meanwhile, the processing is convenient and easy to realize.
Preferably, the depth of the first groove is the same as the depth of the second groove. Through the arrangement, the acting force of the sealing ring of the first groove and the wall of the corresponding second groove is balanced with the acting force of the sealing ring of the second groove and the wall of the corresponding first groove, and the wall of the second groove and the wall of the first groove can be respectively abutted against the sealing ring of the first groove and the sealing ring of the second groove. Thereby improving the sealing effect. Meanwhile, the structure is simple and easy to realize.
In one embodiment, a cooperating catch is provided on the outside of the outer wall of the first groove and the inside of the outer wall of the second groove, or on the inside of the outer wall of the first groove and the outside of the outer wall of the second groove. By this arrangement the container and closure can be conveniently connected together, allowing for quick installation. Meanwhile, the structure can avoid the phenomenon that the sealing cover is loosened relative to the container and generates air leakage. Therefore, the sealing safety is enhanced, and the accuracy of an analysis result is ensured.
In one embodiment, the cover is provided as an arc-shaped inner cavity. Preferably, the air port is provided at the topmost end of the arc-shaped inner cavity. The gas in the container is convenient to gather through the arrangement, and the accuracy of an analysis result is ensured.
Preferably, the container is made of polycarbonate. The characteristics of high hardness, light weight, good weather resistance and the like are utilized, and the method is suitable for storage, transportation and repeated utilization of samples.
Preferably, the container is provided with a volume scale. With this arrangement, the sample volume can be quantified.
According to another aspect of the present invention, there is provided a method of using the above apparatus, comprising the steps of:
the method comprises the following steps: charging a first quantity of saturated sodium chloride solution into a container;
step two: placing a fresh soil sample into a container, and enabling the liquid level of the saturated sodium chloride solution to reach a second fixed quantity;
step three: sealing the container with a closure;
step four: vibrating the device filled with the soil sample to exchange the gas in the weak adsorption state on the surface of the soil sample with the headspace gas in the device;
step five: the device is static to balance the headspace gas in the device, and saturated sodium chloride solution is injected into the device from a liquid port to ensure that the gas in the container is in a positive pressure state;
step six: gas is collected at the gas port.
In the process, the sealing of the gas in the device is ensured, and the accuracy of sample analysis is ensured.
Preferably, a saturated sodium chloride solution is added to the first tank before step three, i.e. before the closure is mounted on the container. Thereby forming a liquid seal between the sealing cover and the container and ensuring the sealing effect of the container and the sealing cover.
Compared with the prior art, the invention has the advantages of simple structure, good sealing effect, rapid sample loading, convenient transportation, repeated use and convenient operation.
Drawings
Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. In the figure:
FIG. 1 shows a device for headspace gas collection according to the invention;
fig. 2 shows a top view of the container from the device of fig. 1.
In the drawings, like parts are provided with like reference numerals. The figures are not drawn to scale.
Detailed Description
The invention will be further explained with reference to the drawings.
Fig. 1 shows a device 50 for headspace gas collection according to the invention. As shown in fig. 1, the apparatus 50 includes a container 2, a closure 1 detachably connected to the container 2, a gas port 3 provided on the closure 1, a liquid port 4 provided on the closure 1, a gas port closure 15 detachably connected to the gas port 3, a liquid port closure 16 detachably connected to the liquid port 4, a gas port gasket 17 provided between the gas port 3 and the gas port closure 15, and a liquid port gasket 18 provided between the liquid port 4 and the liquid port closure 16. A first groove 6 is provided in the circumferential direction of the open end face 5 of the container 2, a second groove 8 is provided in the circumferential direction of the open end face 7 of the closure 1, a wall (inner wall 14 or outer wall 13) defining the second groove 8 is accommodated in the first groove 6, a wall (outer wall 11 or inner wall 12) defining the first groove 6 is accommodated in the second groove 8, a seal ring 9 is provided in the first groove 6, and a seal ring 10 is provided in the second groove 8. In the state in which the container 2 is mounted with the closure 1, the wall of the second groove 8 (inner wall 14 or outer wall 13) corresponding to the first groove 6 is arranged to be in sealing contact with the sealing ring 9 of the first groove 6, and the wall of the first groove 6 (outer wall 11 or inner wall 12) corresponding to said second groove 8 is arranged to be in sealing contact with the sealing ring 10 of the second groove 8. Thus, a double-layer seal is formed, the sealing effect of the device 50 is increased, and the phenomenon of air leakage in the process of storage, transportation or test is avoided.
As shown in fig. 1 and 2, the sealing rings 9 and 10 are preferably elastic silicone O-rings.
If the circumferential dimension of the closure 1 is greater than the circumferential dimension of the container 2, as shown in fig. 1, the outer wall 11 of the first groove 6 fits into the second groove 8 and the inner wall 14 of the second groove 8 fits into the first groove 6. The ratio of the width of the first groove 6 to the width of the inner wall 14 of the corresponding second groove 8 is 1.05-2, and/or the ratio of the width of the second groove 8 to the width of the inner wall 11 of the corresponding first groove 6 is 1.05-2. The first groove 6 is a clearance fit with the inner wall 14 and/or the second groove 8 is a clearance fit with the inner wall 11, thereby facilitating easy and quick mounting of the closure 1 with the container 2. Meanwhile, the inner wall 14 can have a reasonable contact area with the sealing ring 9 of the first groove 6, and/or the inner wall 11 can have a reasonable contact area with the sealing ring 10 of the second groove 8, so that pressure equalization is ensured, and better sealing is facilitated. And is convenient to manufacture. It is noted that the term "width" in this application is a radial dimension.
In order to ensure better sealing effect, the depth of the first groove 6 and/or the depth of the second groove 8 are 3-20 mm. Note that the depth of the first groove 6 is the distance from the groove bottom of the first groove 6 to the end surface 5, and the depth of the second groove 8 is the distance from the groove bottom of the second groove 8 to the end surface 7. Preferably, the depth of the first grooves 6 is the same as the depth of the second grooves 8. The acting force of the sealing ring 9 of the first groove 6 and the corresponding inner wall 14 of the second groove 8 is balanced with the acting force of the sealing ring 10 of the second groove 8 and the corresponding outer wall 11 of the first groove 6, so that the inner wall 14 of the second groove 8 and the outer wall 11 of the first groove 6 can respectively abut against the sealing ring 9 and the sealing ring 10. Thereby improving the sealing effect. Meanwhile, the structure is simple, and processing and manufacturing are facilitated.
As shown in fig. 1, cooperating snap catches 19, 20 are provided on the outside of the outer wall 11 of the first groove 6 and on the inside of the outer wall 13 of the second groove 8 for securing the container 2 and the closure 1 together. The connecting structure is simple and easy to realize, and ensures quick connection. Meanwhile, the sample is not easy to lose efficacy in the process of sample preservation or transportation, and the sealing is effectively ensured.
It should be noted that if the circumferential dimension of the closure 1 is smaller than the circumferential dimension of the container 2 (not shown in the figures), i.e. during the mating of the closure 1 with the container 2, the first groove 6 receives the outer wall 13 of the second groove 8, while the second groove 8 receives the inner wall 12 of the first groove 6. Meanwhile, a matched buckle is arranged on the inner side of the outer wall 11 of the first groove 6 and the outer side of the outer wall 13 of the second groove 8. This arrangement also enables double sealing. And thus fall within the scope of the present invention. The structure and the fitting relationship thereof are the same as or similar to those described above, and a detailed description thereof is omitted.
Preferably, the container 2 is cylindrical. The outer wall of the container 2 is provided with volume scales. Further preferably, the container 2 is made of polycarbonate. The transparent glass fiber reinforced plastic film has the characteristics of high hardness, light weight, good weather resistance and the like, is suitable for storage, transportation and repeated utilization of samples, has transparency, and realizes the quantification of the samples.
To facilitate gas accumulation within the device 50 and ensure sample authenticity, the internal cavity of the closure 1 is arcuately shaped as shown in figure 1. Preferably, the air port 3 is arranged at the topmost end of the arc-shaped inner cavity, so that air can be taken out from the air port 3 more conveniently.
The method of using the apparatus 50 to collect headspace air is described in detail below:
first, 200ml of a saturated sodium chloride solution was charged into a container 2; secondly, putting a fresh soil sample into the container 2, and enabling the liquid level of the solution to reach the 500ml scale of the container; thirdly, the sealing cover 1 is matched with the container 2, the rotation is carried out, the clamping buckles 19 and 20 are matched, and the sealing cover 1 and the container 2 are clamped together (a part of saturated sodium chloride solution can be added into the first groove 6, so that the sealing effect between the container 2 and the sealing cover 1 is better); then, the sealing device 50 with the sample is placed in an oscillator and is oscillated for 60min at the speed of 60 times/min, so that the gas in the weak adsorption state on the surface of the sample is fully exchanged with the headspace gas of the device 50; then, standing the device 50 for 30min to balance the headspace gas in the device, and injecting a certain amount of saturated sodium chloride solution into the device 50 from the liquid port 4 to ensure that the gas in the container 2 is in a positive pressure state; finally, from gas port 3, the gas in container 2 is extracted using a syringe or sampler.
The above description is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily make changes or variations within the technical scope of the present invention disclosed, and such changes or variations should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (7)
1. A device for collecting headspace air, comprising a container, a cover detachably connected to the container, a gas port and a liquid port provided in the cover to communicate the inside and outside of the container, a gas port cover and a liquid port cover detachably connected to the gas port and the liquid port, respectively, a gas port gasket provided between the gas port and the gas port cover, and a liquid port gasket provided between the liquid port and the liquid port cover, wherein a first groove is provided in a circumferential direction on an opening end surface of the container, a second groove is provided in a circumferential direction on the opening end surface of the cover, a wall for defining the second groove is accommodated in the first groove, a wall for defining the first groove is accommodated in the second groove, seal rings are provided in both the first groove and the second groove, and a wall of the second groove corresponding to the first groove is provided so as to be able to contact with the seal ring of the first groove, the wall of the first groove corresponding to the second groove is provided with a sealing ring which can be in sealing contact with the second groove; the sealing rings are elastic silica gel O-shaped sealing rings;
the sealing cover is arranged into an arc-shaped inner cavity; the air port is arranged at the topmost end of the arc-shaped inner cavity;
the ratio of the width of the first groove to the wall width of the corresponding second groove is 1.05-2, and/or the ratio of the width of the second groove to the wall width of the corresponding first groove is 1.05-2;
a saturated sodium chloride solution is arranged in the first tank;
the upper end and the lower end of the region where the saturated sodium chloride solution is located are limited by a sealing ring at the bottom of the first groove and a sealing ring at the top of the second groove respectively, and the left end and the right end of the region are limited by the inner wall of the first groove and the inner wall of the second groove respectively.
2. The device of claim 1, wherein the depth of the first groove and/or the depth of the second groove is 3-20 mm.
3. The apparatus of claim 1, wherein the depth of the first groove is the same as the depth of the second groove.
4. The device of claim 1, wherein a mating catch is provided on the outside of the outer wall of the first groove and the inside of the outer wall of the second groove, or on the inside of the outer wall of the first groove and the outside of the outer wall of the second groove.
5. The device of claim 1, wherein the container is made of polycarbonate.
6. The device of claim 1, wherein the container is provided with a volume scale.
7. A method of collecting headspace air using the device of any one of claims 1 to 6, comprising the steps of:
the method comprises the following steps: charging said container with a first quantity of saturated sodium chloride solution;
step two: placing a fresh soil sample into the container to enable the liquid level of the saturated sodium chloride solution to reach a second quantitative value;
step three: sealing the container with the closure;
step four: oscillating the device filled with the soil sample to exchange the gas in the weak adsorption state on the surface of the soil sample with the headspace gas in the device;
step five: standing the device to balance the headspace gas in the device, and injecting the saturated sodium chloride solution into the device from the liquid port to ensure that the gas in the container is in a positive pressure state;
step six: gas is collected at the gas port.
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| CN201410222849.3A CN105092314B (en) | 2014-05-23 | 2014-05-23 | Apparatus for headspace collection and method of using the same |
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| CN201410222849.3A CN105092314B (en) | 2014-05-23 | 2014-05-23 | Apparatus for headspace collection and method of using the same |
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| CN203405364U (en) * | 2013-08-08 | 2014-01-22 | 恒泰尚合能源技术（北京）有限公司 | Visual desorption tank |
| CN203422237U (en) * | 2013-09-03 | 2014-02-05 | 上海化工研究院 | Sampling device for GC-MS (gas chromatography-mass spectrometer) headspace analysis |
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| CN105092314A (en) | 2015-11-25 |
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