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Method for detecting heavy metals in plastics

A detection method and technology for heavy metals, applied in the field of heavy metal detection, can solve the problems of cross-contamination, non-discovery, long digestion time, etc., and achieve the effects of high recovery rate, good stability and guaranteeing detection accuracy.

Inactive Publication Date: 2014-10-29
深圳出入境检验检疫局玩具检测技术中心
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional plastic digestion has the following defects: electrothermal digestion requires strong acid and high temperature (above 200°C); open digestion has the risk of cross-contamination; digestion takes a long time
However, at present, the analysis of heavy metal elements in organic samples by FAAS is mainly used in the determination of heavy metal elements in oil products, and the application of heavy metal elements in plastics dissolved in organic solvents has not been found yet.

Method used

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  • Method for detecting heavy metals in plastics
  • Method for detecting heavy metals in plastics
  • Method for detecting heavy metals in plastics

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Crush 0.1-0.2g of the PVC or PE plastic sample to be tested and put it into a sealable container, add 10mL of tetrahydrofuran, and ultrasonically shake for 60min in a water bath at 80°C to fully dissolve the sample. Then, 10 mL of 20% (V / V) nitric acid was added to the obtained solution, and ultrasonic vibration was performed at room temperature for 30 min. Then the above-mentioned shaken solution was filtered and washed with 20% (V / V) nitric acid, and finally the volume was adjusted to 50 mL to prepare a solution to be tested containing an organic solvent.

Embodiment 2

[0052] Crush 0.1-0.2g of the PVC or PE plastic sample to be tested and put it into a sealable container, add 10mL of tetrahydrofuran, and ultrasonically shake for 45min in a water bath at 85°C to fully dissolve the sample. Then, 10 mL of 15% (V / V) nitric acid was added to the obtained solution, and ultrasonic vibration was performed at room temperature for 30 min. Then the above shaken solution was filtered and washed with 15% (V / V) nitric acid, and finally the volume was adjusted to 50 mL to prepare a solution to be tested containing an organic solvent.

Embodiment 3

[0054] Crush 0.1-0.2g of the PVC or PE plastic sample to be tested and put it into a sealable container, add 10mL of tetrahydrofuran, and ultrasonically shake for 30min in a water bath at 90°C to fully dissolve the sample. Then, 10 mL of 10% (V / V) nitric acid was added to the obtained solution, and ultrasonic vibration was performed at room temperature for 30 min. Then the above-mentioned shaken solution was filtered and washed with 10% (V / V) nitric acid, and finally the volume was adjusted to 50 mL to prepare a solution to be tested containing an organic solvent.

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Abstract

The invention discloses a method for detecting heavy metals in plastics. The method comprises the following steps: S1. putting the plastics to be detected in an airtight container filled with an organic solvent, and carrying out ultrasonic oscillation in a water bath to dissolve the plastics, thus obtaining a plastic dissolution solution; S2. adding dilute nitric acid to the plastic dissolution solution, carrying out ultrasonic oscillation at room temperature, and carrying out filtration, washing and constant volume achievement to extract heavy metals in the plastic dissolution solution, thus obtaining a solution to be detected, containing the organic solvent; S3. qualitatively and quantitatively analyzing the heavy metals in the solution to be detected by adopting a flame atomic absorption spectrometer (FAAS). The method has the beneficial effects that by utilizing the characteristic that the plastics have better solubility in the organic solvent, the plastics are dissolved by using the proper organic solvent, and then the heavy metals in the plastics are extracted to form the solution to be detected, containing the organic solvent; then the heavy metals dissolved in the organic solvent are qualitatively and quantitatively analyzed by adopting the FAAS. The method has the advantages of simple and fast operating process, mild reaction conditions, accuracy in detection, high recovery rate and good stability, and is suitable for mass treatment.

Description

technical field [0001] The invention relates to a heavy metal detection method, in particular to a heavy metal detection method in plastics. Background technique [0002] Due to the wide range of raw material sources, various types, easy processing, low processing cost, and excellent performance, plastics have become an indispensable class of important materials in various industries. Plastic products are widely used in food packaging, building materials, children's toys, medical equipment, electronic appliances, etc. Due to the widespread use of plastics, the requirements for toxic additives in plastics are quite strict. [0003] Looking at the current standards and detection methods, the determination of heavy metal elements such as lead and cadmium in plastics is generally carried out by electrothermal digestion or microwave digestion with acid as the medium, and then using AAS (atomic absorption spectrometer), ICP-OES (inductively coupled plasma Mass emission spectrome...

Claims

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Application Information

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IPC IPC(8): G01N21/31G01N21/71G01N1/28
Inventor 李宣麦宝华卢瑜禹伟腾李许梁淑雯董夫银
Owner 深圳出入境检验检疫局玩具检测技术中心
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