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A method for the determination of lead, cadmium, chromium and mercury in plastics by edta-2na complex digestion

An edta-2na, plastic technology, which is applied in the preparation of test samples, material excitation analysis, thermal excitation analysis, etc., can solve the problem that mercury cannot be measured, and achieves prevention of mercury loss, effective analysis results, and accuracy. Precision meets effect

Inactive Publication Date: 2018-07-06
DONGGUAN ENTRY EXIT INSPECTION & QUARANTINE BUREAU +1
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  • Application Information

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Problems solved by technology

For the above two reasons, traditional wet digestion cannot be used for the determination of mercury in plastics.

Method used

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  • A method for the determination of lead, cadmium, chromium and mercury in plastics by edta-2na complex digestion
  • A method for the determination of lead, cadmium, chromium and mercury in plastics by edta-2na complex digestion
  • A method for the determination of lead, cadmium, chromium and mercury in plastics by edta-2na complex digestion

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Embodiment Construction

[0023] The measuring instrument used in this method is: ICP-OES 710-OES Inductively Coupled Plasma Atomic Emission Spectrometer, the working conditions are: emission power: 1.20kW; plasma gas: 15.0L min -1 ;Auxiliary air flow: 1.50L min -1 ; Atomizing gas: 200kPa; One reading time: 5s; Stabilization time: 15s.

[0024] SM200 anti-heavy metal pollution type rotary grinder is equipped with a special bottom sieve without heavy metal pollution grinding, the sieve hole is 0.5mm; Zhejiang Shangyu Daoxu Wusi Instrument Sand Screen Factory national standard inspection sieve, the hole diameter is 0.5mm. In addition, for comparison, the traditional wet digestion instrument ----- EH35B intelligent sample digester should be used when testing the comparative example.

[0025] In addition, prepare lead, cadmium, chromium mixed element standard solution, mercury single element standard solution are 50mg L -1 .

[0026] The reagents used in the present invention are all high-grade pure rea...

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Abstract

The present invention discloses a method for determining lead, cadmium, chromium and mercury in a plastic through EDTA-2Na complexation digestion. The method comprises: 1, preparing a detected sample, wherein EDTA-2Na is added to a sample solution and volume metering is performed to obtain the sample to be detected; 2, drawing a standard work curve, wherein prepared standard solutions with different concentrations are sequentially placed into an inductively coupled plasma atomic emission spectrometer, the standard work curve is drawn, and the corresponding linear regression equation is obtained according to the standard work curve; and 3, determining the detected sample, wherein the sample to be detected and obtained in the step 1 is tested, and the lead content, the cadmium content, the chromium content and the mercury content in the sample are calculated according to the linear regression equation. According to the present invention, with the EDTA-2Na complexation digestion method, the problem that the traditional wet digestion method can not determine the lead and the mercury in the plastic is solved; and with the method, the total content of the four elements such as lead, cadmium, chromium and mercury can be simultaneously and accurately determined, the detection accuracy and the detection precision can meet the detection requirements of the RoHS command, and the analysis results are effective and reliable.

Description

Technical field: [0001] The invention relates to the technical field of detection methods for harmful metals in plastics, in particular to an EDTA-2Na complex digestion method for determining lead, cadmium, chromium and mercury in plastics. Background technique: [0002] Since the European Parliament and the Council promulgated No. 2002 / 95 / EC on January 23, 2003, "Restriction of the use of certain hazardous substances in electrical and electronic equipment" (referred to as "RoHS Directive"), for electrical and electronic equipment There are many detection methods for the four elements of lead, cadmium, chromium and mercury, but the detection methods of each element are independent, and no method can simultaneously determine the total content of the four elements of lead, cadmium, chromium and mercury Make accurate measurements. [0003] In addition, in the traditional wet digestion method currently used, when the lead element is detected, since the lead compound can be used...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/71G01N1/28G01N1/44
Inventor 黄伟王斌温健昌陈晨况丽蒋小良罗文振方成李晓丹黄雪琳李春雷钟康华林伦飞周星星
Owner DONGGUAN ENTRY EXIT INSPECTION & QUARANTINE BUREAU
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