CN102373334A - Extraction method of hexavalent chromium in plastics - Google Patents
Extraction method of hexavalent chromium in plastics Download PDFInfo
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- CN102373334A CN102373334A CN2010102509287A CN201010250928A CN102373334A CN 102373334 A CN102373334 A CN 102373334A CN 2010102509287 A CN2010102509287 A CN 2010102509287A CN 201010250928 A CN201010250928 A CN 201010250928A CN 102373334 A CN102373334 A CN 102373334A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
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Abstract
The invention discloses an extraction method of hexavalent chromium in plastics. The method comprises the following steps: mixing plastics and an extract to obtain a mixture; mixing the mixture continuously in an enclosed environment at 80-160 DEG C for a while; standing and recovering an inorganic phase, centrifuging and layering the inorganic phase to obtain an inorganic layer clear liquid containing hexavalent chromium; and the extract is a mixture of an organic solvent and an alkaline solution. According to the extraction method of hexavalent chromium in plastics of the invention, recovery rate of total Cr and hexavalent chromium extracted from the plastics is high, so as to detect Cr (VI) in plastic products accurately.
Description
Technical field
The present invention relates to chromic process for extracting in a kind of plastics.
Background technology
Chromium (Cr) is the metallic element that often touches in the daily life, is widely used at industrial circles such as plating, metallurgy, dyestuffs.Cr exists sexavalence and two kinds of valence states of trivalent; Be expressed as sexavalent chrome (Cr (VI)) and trivalent chromium (Cr (III)) respectively; Wherein Cr (VI) is strong carcinogens, and Cr (III) is then to the human body beneficial, so will understand the harm of Cr in the plastics; The total amount that detects Cr is meaningless, and must detect Cr (VI) wherein.At present; Though " the limiting the use of the objectionable impurities instruction in electric, the electronics " of European Union (RoHS) in regulation detect Cr (VI); And the related work group has also provided the method that alkali lye extracts in standard in the process of implementation, but because plastic construction is fine and close, alkali lye is difficult to get into its inside; So this method can not effectively be extracted the Cr (VI) in the plastics, cause Cr in the plastics (VI) to be in the awkward condition detecting, supervise of having no way of.
Summary of the invention
The purpose of this invention is to provide chromic process for extracting in the high plastics of a kind of recovery.
Chromic process for extracting comprises the steps: in the plastics of the present invention
Plastics and extracting solution are mixed, obtain mixture;
In the closed environment, mixture is in 80～160 ℃ of lasting mixing some times of temperature;
Leave standstill and reclaim inorganic phase, inorganic mutually centrifugal layering obtains containing chromic inorganic layer clear liquid;
Said extracting solution is the mixture of organic solvent and basic soln.
Chromic process for extracting in the plastics of the present invention, wherein: said organic solvent is the benzene series thing, any in ester and the aliphatic hydrocarbon or appoint several kinds;
Chromic process for extracting in the plastics of the present invention, wherein: the solute of said basic soln be in Lithium Hydroxide MonoHydrate, sodium hydroxide, Pottasium Hydroxide, yellow soda ash and the salt of wormwood any or appoint several kinds.
Chromic process for extracting in the plastics of the present invention, wherein: the said extracting solution of the said plastics of every gram and 0.01～1L mixes.
Chromic process for extracting in the plastics of the present invention, wherein: the volume ratio of said organic solvent and said basic soln is (1～10): (1～30).
Chromic process for extracting in the plastics of the present invention, wherein: the concentration of solute is 0.01mol/L～1mol/L in the said basic soln.
Chromic process for extracting in the plastics of the present invention, wherein: the said some time is 10min at least.
Chromic process for extracting in the plastics of the present invention, wherein: the mode of said lasting mixing be in stirring, microwave, ultrasonic, the DL any or appoint several kinds.
Chromic process for extracting in the plastics of the present invention, wherein: said organic solvent is benzene, nonane, ETHYLE ACETATE, toluene or YLENE.
Chromic process for extracting in the plastics of the present invention, the total Cr that from plastics, extracts and the chromic recovery are high, can accurately detect the Cr (VI) in the plastics.
Embodiment
Embodiment 1,
0.1g polycarbonate (PC) and the mixing of 0.012L extracting solution are put in the encloses container that has heating and whipping appts; Heat after the sealing; Temperature remains on 140 ℃, stirs 30 minutes, and extracting solution is contacted with the thorough mixing of polycarbonate (PC); Extracting solution is benzene and lithium hydroxide solution according to volume ratio is to be mixed and made at 1: 5, and wherein the concentration of lithium hydroxide solution is 0.125mol/L; Leave standstill after extract finishing and reclaim inorganic phase, inorganicly continue centrifugal layering mutually, get the inorganic layer clear liquid and measure total Cr and Cr (VI) in the solution.
Total Cr recovery of standard addition is between 90%～110%; Cr (VI) recovery of standard addition reaches 90%～110%.
Embodiment 2,
0.1g Vestolen PP 7052 (PP) and the mixing of 0.1L extracting solution are put in the encloses container that has heating and DL device; Heat after the sealing; Temperature remains on 130 ℃, stirs 60 minutes, and extracting solution is contacted with the thorough mixing of Vestolen PP 7052 (PP); Extracting solution is nonane and sodium hydroxide solution according to volume ratio is to be mixed and made at 1: 30, and wherein the concentration of sodium hydroxide solution is 0.01mol/L; Leave standstill after extract finishing and reclaim inorganic phase, inorganicly continue centrifugal layering mutually, get the inorganic layer clear liquid and measure total Cr and Cr (VI) in the solution.
Total Cr recovery of standard addition is between 90%～110%; Cr (VI) recovery of standard addition reaches 90%～110%.
Embodiment 3,
0.1g acrylonitrile-butadiene-styrene copolymer (ABS) and the mixing of 0.013L extracting solution are put in the encloses container that has heating and burnt ultrasonic extraction device; Heat after the sealing; Temperature remains on 140 ℃, stirs 100 minutes, and extracting solution is contacted with the thorough mixing of acrylonitrile-butadiene-styrene copolymer (ABS); Extracting solution is ETHYLE ACETATE and potassium hydroxide solution according to volume ratio is to be mixed and made at 10: 1, and wherein the concentration of potassium hydroxide solution is 1mol/L; Leave standstill after extract finishing and reclaim inorganic phase, inorganicly continue centrifugal layering mutually, get the inorganic layer clear liquid and measure total Cr and Cr (VI) in the solution.
Total Cr recovery of standard addition is between 90%～110%; Cr (VI) recovery of standard addition reaches 90%～110%.
Embodiment 4,
0.1g acrylonitrile-butadiene-styrene copolymer (ABS) and the mixing of 0.012L extracting solution are put in the encloses container that has heating and burnt ultrasonic extraction device; Heat after the sealing; Temperature remains on 160 ℃, stirs 100 minutes, and extracting solution is contacted with the thorough mixing of acrylonitrile-butadiene-styrene copolymer (ABS); Extracting solution is benzene and sodium carbonate solution according to volume ratio is to be mixed and made at 1: 5, and wherein the concentration of sodium carbonate solution is 0.5mol/L; Leave standstill after extract finishing and reclaim inorganic phase, inorganicly continue centrifugal layering mutually, get the inorganic layer clear liquid and measure total Cr and Cr (VI) in the solution.
Total Cr recovery of standard addition is between 90%～110%; Cr (VI) recovery of standard addition reaches 90%～110%.
Embodiment 5,
0.15g Vestolen PP 7052 (PP) and the mixing of 0.02L extracting solution are put in the encloses container that has heating and DL device; Heat after the sealing; Temperature remains on 80 ℃, stirs 10 minutes, and extracting solution is contacted with the thorough mixing of Vestolen PP 7052 (PP); Extracting solution is toluene and solution of potassium carbonate according to volume ratio is to be mixed and made at 3: 1, and wherein the concentration of solution of potassium carbonate is 0.015mol/L; Leave standstill after extract finishing and reclaim inorganic phase, inorganicly continue centrifugal layering mutually, get the inorganic layer clear liquid and measure total Cr and Cr (VI) in the solution.
Total Cr recovery of standard addition is between 90%～110%; Cr (VI) recovery of standard addition reaches 90%～110%.
Embodiment 6,
0.12g polycarbonate (PC) and the mixing of 0.015L extracting solution are put in the encloses container that has heating and whipping appts, heat after the sealing, temperature remains on 135 ℃; Stirred 30 minutes; Extracting solution is contacted with the thorough mixing of polycarbonate (PC), and extracting solution is benzene and basic soln according to volume ratio is to be mixed and made at 3: 12, and wherein the solute of basic soln is the mixture of Lithium Hydroxide MonoHydrate and sodium hydroxide; The concentration of Lithium Hydroxide MonoHydrate is 0.08mol/L, and concentration sodium hydroxide is 0.075mol/L; Leave standstill after extract finishing and reclaim inorganic phase, inorganicly continue centrifugal layering mutually, get the inorganic layer clear liquid and measure total Cr and Cr (VI) in the solution.
Total Cr recovery of standard addition is between 90%～110%; Cr (VI) recovery of standard addition reaches 90%～110%.
Embodiment 7,
0.1g polycarbonate (PC) and the mixing of 0.001L extracting solution are put in the encloses container that has heating and whipping appts, heat after the sealing, temperature remains on 130 ℃; Stirred 50 minutes; Extracting solution is contacted with the thorough mixing of polycarbonate (PC), and extracting solution is YLENE and basic soln according to volume ratio is to be mixed and made at 1: 5, and wherein the solute of basic soln is the mixture of Pottasium Hydroxide and yellow soda ash; The concentration of Pottasium Hydroxide is 0.5mol/L, and the concentration of yellow soda ash is 0.2mol/L; Leave standstill after extract finishing and reclaim inorganic phase, inorganicly continue centrifugal layering mutually, get the inorganic layer clear liquid and measure total Cr and Cr (VI) in the solution.
Total Cr recovery of standard addition is between 90%～110%; Cr (VI) recovery of standard addition reaches 90%～110%.
Above embodiment describes preferred implementation of the present invention; Be not that scope of the present invention is limited; Design under the prerequisite of spirit not breaking away from the present invention; Various distortion and improvement that the common engineering technical personnel in this area make technical scheme of the present invention all should fall in the definite protection domain of claims of the present invention.
Claims (9)
1. chromic process for extracting in the plastics comprises the steps:
Plastics and extracting solution are mixed, obtain mixture;
In the closed environment, mixture is in 80～160 ℃ of lasting mixing some times of temperature;
Leave standstill and reclaim inorganic phase, inorganic mutually centrifugal layering obtains containing chromic inorganic layer clear liquid;
Said extracting solution is the mixture of organic solvent and basic soln.
2. method according to claim 1 is characterized in that: said organic solvent is the benzene series thing, any in ester and the aliphatic hydrocarbon or appoint several kinds.
3. method according to claim 1 is characterized in that: the solute of said basic soln be in Lithium Hydroxide MonoHydrate, sodium hydroxide, Pottasium Hydroxide, yellow soda ash and the salt of wormwood any or appoint several kinds.
4. according to arbitrary described method among the claim 1-3, it is characterized in that: the said extracting solution of the said plastics of every gram and 0.01～1L mixes.
5. according to arbitrary described method among the claim 1-3, it is characterized in that: the volume ratio of said organic solvent and said basic soln is (1～10): (1～30).
6. method according to claim 3 is characterized in that: the concentration of solute is 0.01mol/L～1mol/L in the said basic soln.
7. method according to claim 1 is characterized in that: the said some time is 10min at least.
8. method according to claim 1 is characterized in that: the mode of said lasting mixing be in stirring, microwave, ultrasonic, the DL any or appoint several kinds.
9. method according to claim 2 is characterized in that: said organic solvent is benzene, nonane, ETHYLE ACETATE, toluene or YLENE.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102509287A CN102373334B (en) | 2010-08-11 | 2010-08-11 | Extraction method of hexavalent chromium in plastics |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102509287A CN102373334B (en) | 2010-08-11 | 2010-08-11 | Extraction method of hexavalent chromium in plastics |
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| CN102373334A true CN102373334A (en) | 2012-03-14 |
| CN102373334B CN102373334B (en) | 2013-10-16 |
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| CN2010102509287A Expired - Fee Related CN102373334B (en) | 2010-08-11 | 2010-08-11 | Extraction method of hexavalent chromium in plastics |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103852434A (en) * | 2014-03-26 | 2014-06-11 | 昆山洛丹伦生物科技有限公司 | Quantitative analysis method for content of hexavalent chromium in polymer and electronic components |
| CN105806790A (en) * | 2016-03-15 | 2016-07-27 | 通标标准技术服务有限公司广州分公司 | Measuring method of hexavalent chromium in plastic |
-
2010
- 2010-08-11 CN CN2010102509287A patent/CN102373334B/en not_active Expired - Fee Related
Non-Patent Citations (2)
| Title |
|---|
| 倪德良，张其晖: "《塑料特性与选用》", 30 November 1994 * |
| 罗道军，卞征云，郭平叶，苏春红: "聚合物材料中六价铬萃取方法研究", 《分析化学研究简报》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103852434A (en) * | 2014-03-26 | 2014-06-11 | 昆山洛丹伦生物科技有限公司 | Quantitative analysis method for content of hexavalent chromium in polymer and electronic components |
| CN105806790A (en) * | 2016-03-15 | 2016-07-27 | 通标标准技术服务有限公司广州分公司 | Measuring method of hexavalent chromium in plastic |
| CN105806790B (en) * | 2016-03-15 | 2019-02-19 | 通标标准技术服务有限公司广州分公司 | The measuring method of Cr VI in a kind of plastics |
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| CN102373334B (en) | 2013-10-16 |
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