Method of detecting heavy metals in polyethylene plastic

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...

AI Technical Summary

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

Images