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Method for extracting soluble hexavalent chromium compounds from polymer materials

A polymer material, soluble technology, used in the field of chemical analysis, can solve problems such as affecting accuracy, and achieve the effect of being conducive to detection and simple operation

Inactive Publication Date: 2012-06-13
SHENZHEN ENTRY EXIT INSPECTION & QUARANTINE BUREAU INDAL PROD INSPECTION TECH CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Studies have shown that the extraction rate obtained by this method is closely related to the matrix material, particle size, extraction conditions, etc. The extraction efficiency of hexavalent chromium in some polymer materials is relatively high, while some are very low, and even cannot be extracted completely. greatly affect the accuracy of its detection

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A method for extracting soluble hexavalent chromium compounds in polymer materials, comprising the steps of:

[0022] 1) Dissolving: select acetone to completely dissolve the polymer;

[0023] 2) The first back extraction: Add the above-mentioned dissolved mixture to a saturated ammonium sulfate solution 0.1 times the volume of acetone, mix well, let it stand for layering, and take out the lower aqueous solution;

[0024] 3) The second back extraction: Add 0.1 times the volume of acetone saturated ammonium sulfate solution to the upper organic solution, mix well, let stand for stratification, and then take out the lower aqueous solution;

[0025] 4) Combination: the two aqueous solutions are combined to obtain the fully extracted aqueous solution of soluble hexavalent chromium.

Embodiment 2

[0027] A method for extracting soluble hexavalent chromium compounds in polymer materials, comprising the steps of:

[0028] 1) Dissolving: select acetone to completely dissolve the polymer;

[0029] 2) Back extraction for the first time: Add the above-mentioned dissolved mixture to a saturated sodium chloride solution 0.1 times the volume of acetone, mix well, let it stand for stratification, and take out the lower aqueous solution;

[0030] 3) The second back extraction: Add 0.1 times the volume of acetone saturated sodium chloride solution to the upper organic solution, mix well, let stand for stratification, and then take out the lower aqueous solution;

[0031] 4) Combination: the two aqueous solutions are combined to obtain the fully extracted aqueous solution of soluble hexavalent chromium.

Embodiment 3

[0033] A method for extracting soluble hexavalent chromium compounds in polymer materials, comprising the steps of:

[0034] 1) Dissolving: select acetone to completely dissolve the polymer;

[0035] 2) Back extraction for the first time: Add the above-mentioned dissolved mixture to a saturated magnesium chloride solution 0.1 times the volume of acetone, mix well, let it stand for stratification, and take out the lower aqueous solution;

[0036] 3) The second back extraction: add 0.1 times the volume of acetone saturated magnesium chloride solution to the upper organic solution, mix well, let stand to separate, and then take out the lower aqueous solution;

[0037] 4) Combination: the two aqueous solutions are combined to obtain the fully extracted aqueous solution of soluble hexavalent chromium.

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Abstract

The invention discloses a method for completely extracting soluble hexavalent chromium from polymers and keeping valence states of chromium in original compounds unchanged. Firstly, tetrahydrofuran or acetone soluble polymers of organic solvents are used; and secondly, saturated inorganic salt solution is used for re-extracting the hexavalent chromium twice to combine a water layer. The method has the remarkable advantages that (1) the method can be used for completely extracting the soluble hexavalent chromium from polymer materials; (2) the method avoids mutual transformation of the valence states of the chromium in the original compounds while extracting the soluble hexavalent chromium, and is beneficial to detection of the content of the hexavalent chromium; and (3) the method is simple in operation.

Description

technical field [0001] The invention relates to the technical field of chemical analysis, in particular to a method for extracting hexavalent chromium compounds in polymer materials. Background technique [0002] There are many uses of hexavalent chromium salts, especially the large amount of hexavalent chromium (Cr(VI)) used in polymer materials. Cr(VI) is mainly used in plastics for coloring, metallization, etching and obtaining certain Special functions such as resistance to extreme temperature and pressure processing; at the same time, Cr(VI) has a good electronic layer structure, and is also widely used in decorative plastic lamps. However, hexavalent chromium is an ingestion poison / inhalation extremely poison, and skin contact may cause sensitivity; it is more likely to cause hereditary gene defects, inhalation may cause cancer, and has a long-lasting danger to the environment. The EU ROHS Directive ("Restriction on the Use of Certain Hazardous Substances in Electroni...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/28C01G37/00
Inventor 李彬余淑媛宋保靓任聪冯均利刘志红刘冬王宏菊吴透明吴景武邹春海张珠福
Owner SHENZHEN ENTRY EXIT INSPECTION & QUARANTINE BUREAU INDAL PROD INSPECTION TECH CENT
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