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Extraction method of hexavalent chromium in plastics

A kind of extraction method, the technology of hexavalent chromium

Inactive Publication Date: 2013-10-16
BEIJING JITIAN INSTR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, although the detection of Cr(VI) is stipulated in the European Union's "Restriction of Hazardous Substances in Electrical and Electronic Equipment Directive" (RoHS), and during the implementation process, the relevant working groups have also given the method of lye extraction in the standard, However, due to the dense structure of plastics, it is difficult for lye to enter the interior, so this method cannot effectively extract Cr(VI) in plastics, resulting in an embarrassing situation where Cr(VI) in plastic products cannot be detected and supervised.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Mix 0.1g polycarbonate (PC) and 0.012L extract in a closed container with a heating and stirring device, heat it after sealing, keep the temperature at 140°C, and stir for 30 minutes to make the extract and polycarbonate (PC) is fully mixed and contacted, the extract is made by mixing benzene and lithium hydroxide solution according to the volume ratio of 1:5, wherein the concentration of lithium hydroxide solution is 0.125mol / L; after the extraction is completed, the inorganic phase is left to stand and recovered, The inorganic phase continued to be centrifuged and layered, and the supernatant of the inorganic layer was taken to measure the total Cr and Cr(VI) in the solution.

[0020] The recovery rate of the total Cr addition is between 90% and 110%; the recovery rate of Cr(VI) addition reaches 90% to 110%.

Embodiment 2

[0022] Mix 0.1g polypropylene (PP) and 0.1L extract in a closed container with a heating and swirling device, heat it after sealing, keep the temperature at 130°C, and stir for 60 minutes to make the extract and polypropylene ( PP) is fully mixed and contacted, and the extract is prepared by mixing nonane and sodium hydroxide solution according to a volume ratio of 1:30, wherein the concentration of the sodium hydroxide solution is 0.01mol / L; after the extraction is completed, the inorganic phase is left to stand and recovered, The inorganic phase continued to be centrifuged and layered, and the supernatant of the inorganic layer was taken to measure the total Cr and Cr(VI) in the solution.

[0023] The recovery rate of the total Cr addition is between 90% and 110%; the recovery rate of Cr(VI) addition reaches 90% to 110%.

Embodiment 3

[0025] Mix 0.1g of acrylonitrile-butadiene-styrene copolymer (ABS) and 0.013L of the extract into a closed container with a heating and pyro-ultrasonic extraction device, heat after sealing, keep the temperature at 140°C, and stir For 100 minutes, the extract was fully mixed with acrylonitrile-butadiene-styrene copolymer (ABS). The extract was prepared by mixing ethyl acetate and potassium hydroxide solution at a volume ratio of 10:1, wherein hydrogen The concentration of the potassium oxide solution was 1mol / L; after the extraction, the inorganic phase was left to stand and recovered, and the inorganic phase continued to be centrifuged and layered, and the supernatant of the inorganic layer was taken to measure the total Cr and Cr(VI) in the solution.

[0026] The recovery rate of the total Cr addition is between 90% and 110%; the recovery rate of Cr(VI) addition reaches 90% to 110%.

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PUM

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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 [0001] The invention relates to a method for extracting hexavalent chromium in plastics. Background technique [0002] Chromium (Cr) is a metal element that is often encountered in daily life and is widely used in electroplating, metallurgy, dyes and other industrial fields. Cr has two valence states of hexavalent and trivalent, which are expressed as hexavalent chromium (Cr(VI)) and trivalent chromium (Cr(III)), in which Cr(VI) is a strong carcinogen, and Cr(III) It is beneficial to the human body, so to understand the hazards of Cr in plastics, it is meaningless to detect the total amount of Cr, but the Cr(VI) must be detected. At present, although the detection of Cr(VI) is stipulated in the European Union's "Restriction of Hazardous Substances in Electrical and Electronic Equipment Directive" (RoHS), and during the implementation process, the relevant working groups have also given the method of lye extraction in the standard, However, due to the compac...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B34/32
CPCY02P10/20
Inventor 刘霁欣肖融秦德元那星
Owner BEIJING JITIAN INSTR CO LTD
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