Method for measuring cadmium in plastic sample

A measurement method and sample technology, which is applied in the field of system detection and analysis and testing, can solve the problems of high cost, long detection time, inability to apply plastic sample detection, etc., and achieve the effect of reduced loss and high recovery rate

Inactive Publication Date: 2012-06-20
INTERTEK GUANGZHOU TECH SERVICE
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

To solve the current technical problems such as long time-consuming detection, high cost, and inability to apply to the detection of various plastic samples

Method used

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  • Method for measuring cadmium in plastic sample
  • Method for measuring cadmium in plastic sample

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Accurately weigh 0.1 g of the standard sample (PP-H, cadmium content of 92.3 mg / kg) in three times into a microwave digestion tank, add 10 mL of concentrated nitric acid, place the digestion tank in a microwave digestion instrument, and follow the set procedure The sample was subjected to microwave heating and digestion until the sample was completely dissolved. Take out the digestion tank, cool to room temperature, transfer the solution to a 25mL volumetric flask, dilute to the mark with water, and measure it with atomic absorption spectrometer (AAS) and inductively coupled plasma spectrometer (ICP) to measure the cadmium content and take The average value is used to calculate the recovery rate, and the data are as follows:

[0018]

example 2

[0020] Accurately weigh 0.1g of the standard sample (EC-681K, cadmium content of 137 mg / kg) in three times into a microwave digestion tank, add 10 mL of concentrated nitric acid, place the digestion tank in a microwave digestion instrument, follow the set procedure The sample was subjected to microwave heating and digestion until the sample was completely dissolved. Take out the digestion tank, cool to room temperature, transfer the solution to a 25mL volumetric flask, dilute to the mark with water, and measure it with atomic absorption spectrometer (AAS) and inductively coupled plasma spectrometer (ICP). Measure the cadmium content and take the average value to calculate the recovery rate, and the data are as follows:

[0021]

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Abstract

The invention discloses a method for measuring cadmium in a plastic sample. The method comprises the following steps of: putting the weighed plastic sample into a microwave digestion tank, adding concentrated nitric acid for oxidation reduction, and digesting in a microwave digestion instrument to obtain a solution; transferring the digested solution to a volumetric flask for fixing a volume; and introducing the volume-fixed solution into a detection instrument, and measuring the content of an element to be analyzed. The plastic sample is pretreated by various methods such as temperature, pressure, oxidation reduction and the like, molecular structures of various plastic materials can be broken in a short time, the loss of the cadmium element is effectively reduced, the cadmium contained in the plastic sample is completely transferred to the liquid solution, and the method is convenient and quick and high in recovery rate.

Description

technical field [0001] The invention relates to a system detection and analysis test method, in particular to a method for determining the content of harmful substance cadmium in plastic samples. Background technique [0002] With the increasing consumption of consumer electronic products and the increasing awareness of environmental protection around the world, the successful marketing models and experiences brought by green products have enabled the industry to increase sales in addition to traditional methods such as price, quality, and service. A powerful marketing method - "environmentally friendly products". The "Waste Electronic and Electrical Equipment Directive" (WEEE-2002 / 96 / EC) amended by the European Union on January 27, 2003 clearly stipulates that manufacturers of consumer electronic products have the recycling, processing, Responsibility for reuse, with clearly defined goals and timing. For the recycling of waste electronic products, the European Union has f...

Claims

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Application Information

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IPC IPC(8): G01N21/31G01N21/71G01N1/44
Inventor 杨嘉杰张翼
Owner INTERTEK GUANGZHOU TECH SERVICE
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