Method for extracting hexavalent chromium compound from polymer material

A polymer material, hexavalent chromium technology, applied in the field of chemical analysis, can solve problems such as affecting accuracy, and achieve the effect of simple operation

Inactive Publication Date: 2012-06-27
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

[0020] A method for extracting hexavalent chromium compounds in polymer materials, comprising the following steps:

[0021] 1) Dissolving: select acetone to completely dissolve the polymer;

[0022] 2) Back-extraction for the first time: adding an aqueous sodium hydroxide solution with a mass fraction of 0.5%, the volume of the aqueous sodium hydroxide solution is 0.1 times the volume of the organic solvent, fully mixed and left to stand for stratification, and the lower aqueous solution is taken out;

[0023] 3) back extraction for the second time: adding mass fraction again to the upper organic solution is an aqueous sodium hydroxide solution of 0.5%, the volume of the aqueous sodium hydroxide solution is 0.1 times the volume of the organic solvent, fully mixed and left to stand for stratification, Take out the lower floor aqueous solution again;

[0024] 4) Combining: combining the two back-extracted aqueous solutions to obtain an aqueous solution in which hexavalent chrom...

Embodiment 2

[0026] A method for extracting hexavalent chromium compounds in polymer materials, comprising the following steps:

[0027] 1) Dissolving: select acetone to completely dissolve the polymer;

[0028] 2) Back-extraction for the first time: adding a potassium hydroxide aqueous solution with a mass fraction of 0.5%, the volume of the potassium hydroxide aqueous solution is 0.1 times the volume of the organic solvent, fully mixed and left to stand for stratification, and the lower aqueous solution is taken out;

[0029] 3) back extraction for the second time: adding mass fraction again to the upper organic solution is an aqueous potassium hydroxide solution of 0.5%, the volume of the aqueous potassium hydroxide solution is 0.1 times the volume of the organic solvent, fully mixed and left to stand for stratification, Take out the lower floor aqueous solution again;

[0030] 4) Combining: combining the two back-extracted aqueous solutions to obtain an aqueous solution in which hexav...

Embodiment 3

[0032] A method for extracting hexavalent chromium compounds in polymer materials, comprising the following steps:

[0033] 1) Dissolving: select acetone to completely dissolve the polymer;

[0034] 2) Back extraction for the first time: adding an aqueous sodium hydroxide solution with a mass fraction of 2.0%, the volume of the aqueous sodium hydroxide solution is 0.1 times the volume of the organic solvent, fully mixed and left to stand for stratification, and the lower aqueous solution is taken out;

[0035] 3) back extraction for the second time: adding mass fraction again to the upper organic solution is an aqueous sodium hydroxide solution of 2.0%, the volume of the aqueous sodium hydroxide solution is 0.1 times the volume of the organic solvent, fully mixed and left to stand for stratification, Take out the lower floor aqueous solution again;

[0036] 4) Combining: combining the two back-extracted aqueous solutions to obtain an aqueous solution in which hexavalent chrom...

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Abstract

The invention discloses a method for extracting hexavalent chromium from a polymer. Organic solvents such as acetone and tetrahydrofuran are selected and used to fully dissolve the polymer; a sodium hydroxide or potassium hydroxide aqueous solution with a mass fraction of 0.5 percent to 10 percent is added to the polymer, is fully mixed with the polymer and then stand still until layering, and a lower layer aqueous solution is taken out; a sodium hydroxide or potassium hydroxide aqueous solution with a mass fraction of 0.5 percent to 10 percent is re-added into an upper layer organic solution, is fully mixed with the upper layer organic solution and stands still until layering, and a lower layer aqueous solution is re-taken out; and an aqueous solution fully extracting soluble hexavalent chromium and insoluble hexavalent chromium can be obtained only by combining the two lower layer aqueous solutions. The method has the following beneficial effects that: firstly, by adopting the method, the soluble hexavalent chromium and the insoluble hexavalent chromium in a polymer material can be fully extracted; secondly, mutual transformation of chromium valence states in the original compound cannot be caused when the soluble hexavalent chromium and the insoluble hexavalent chromium are extracted by adopting the method; and thirdly, the method has the characteristic that the operation is simple.

Description

technical field [0001] The invention relates to the field of chemical analysis, in particular to the extraction of soluble hexavalent chromium and insoluble 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 and other processing processes; 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 U...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G37/00
Inventor 余淑媛吴透明王宏菊李彬冯均利任聪宋保靓刘冬张珠福吴景武邹春海刘志红
Owner SHENZHEN ENTRY EXIT INSPECTION & QUARANTINE BUREAU INDAL PROD INSPECTION TECH CENT
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