Method of detecting heavy metals in polyethylene plastic

A polyethylene plastic and detection method technology, which is applied in material excitation analysis, thermal excitation analysis and other directions, can solve the problems of heavy metal recovery rate, low precision, loss of volatile elements, low efficiency of dry ashing method, etc. The effect of less volume, improved test quality, and less sample consumption

Inactive Publication Date: 2019-11-19
EAST CHINA NORMAL UNIV
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Problems solved by technology

Among them, the dry ashing method has low efficiency and poor precision
Wet digestion takes a long time, the steps are cumbersome, and the heating and digestion of the open system is easy to cause sample contamination and loss of volatile elements
After the polyethylene plastic sample is digested, when testing, the recovery rate and accuracy of the detection method for heavy metals are not high

Method used

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  • Method of detecting heavy metals in polyethylene plastic
  • Method of detecting heavy metals in polyethylene plastic
  • Method of detecting heavy metals in polyethylene plastic

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Use polyethylene plastic heavy metal standard samples -EC681m was used as the standard quality control sample, and 9 parallel samples were implemented for the standard quality control sample; 5 groups of different actual polyethylene plastic environmental samples (#1~#5) were selected, and 5 parallel samples were implemented for the polyethylene plastic environmental samples.

[0055] Accurately weigh 0.1000g samples (5 groups of different actual polyethylene plastic environmental samples (#1~#5), standard quality control samples) into a high-pressure digestion tank, add concentrated nitric acid 4mL and hydrogen peroxide (mass concentration: 30%) 2mL, let it stand for 15min, put it into the acid catcher, and pre-digest at 85°C for 15min; set the corresponding heating program for the high-pressure digestion tank according to the number of samples, and keep it at 190°C for 50min. After the digestion is completed, take out the high-pressure digestion tank, flush the acid ...

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Abstract

The invention provides a method of detecting heavy metals in polyethylene plastic, which belongs to the technical field of heavy metal detection in an organic material. After a polyethylene plastic sample, concentrated nitric acid and hydrogen peroxide are mixed, the polyethylene plastic sample can be quickly and completely digested by adopting pre-digestion and digestion, a small amount of samples is consumed, a relatively small amount of reagent is used, and multi-element analysis is facilitated. Besides, the obtained digestion solution is detected by adopting ICP-OES, and the heavy metals in the digestion solution can be detected in a high-sensitivity and high-precision mode. The data of the examples show that the detection method of the invention enables the detection limit of Cr to be3.2 mg / kg and the recovery rate to be 99 to 109%; the detection limit of Cd is 0.1 mg / kg and the recovery rate is 97 to 107%; the detection limit of Pb is 6.7 mg / kg and the recovery rate is 97 to 109%; and the detection limit of Zn is 0.03 g / kg and the recovery rate is 103 to 113%.

Description

technical field [0001] The invention relates to the technical field of detecting heavy metals in organic materials, in particular to a method for detecting heavy metals in polyethylene plastics. Background technique [0002] Polyethylene (PE) is a thermoplastic resin obtained by polymerization of ethylene. At room temperature, polyethylene is insoluble in common solvents, has low water absorption and excellent electrical insulation, and is often used as agricultural film, industrial packaging film, wire, cable insulation, etc. In industrial production, polyethylene is used as the base material, and different additives are added according to the application to improve its performance, and a multi-component complex material polyethylene plastic is obtained. For example, lead, cadmium, etc. are widely used as common heat stabilizers. Since heavy metals in heat stabilizers are considered to be carcinogens, the European Union, North America, Japan, etc. have begun to ban the us...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/73
CPCG01N21/73
Inventor 李月杨静邓化瞿建国
Owner EAST CHINA NORMAL UNIV
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