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Method for detecting content of eight heavy metals in plastic

A detection method and plastic technology, applied in the direction of material excitation analysis, preparation of test samples, thermal excitation analysis, etc., can solve the problems of toxicity, protein denaturation, etc., achieve good repeatability and reproducibility, high accuracy, and detection method easy effect

Inactive Publication Date: 2014-06-11
昆山洛丹伦生物科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The ions of heavy metal elements are generally toxic. For example, copper is non-toxic, but copper ions denature proteins and are toxic.

Method used

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  • Method for detecting content of eight heavy metals in plastic
  • Method for detecting content of eight heavy metals in plastic
  • Method for detecting content of eight heavy metals in plastic

Examples

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Embodiment 1

[0039] (a) Use an electronic balance to weigh 0.15±0.001g of the plastic sample and cut it into particles no larger than 0.2g, and put it into the Teflon tube in the microwave digestion device;

[0040] (b) Add 6ml of analytically pure nitric acid reagent, 2ml of analytically pure hydrochloric acid reagent, 1ml of analytically pure hydrogen peroxide reagent into the Teflon tube, cover the explosion-proof head, put the rotor in the microwave device; turn on the microwave device and press F1-Library to start setting parameters , use the up, down, left, and right keys to select the method for setting; if you want to customize the method, please select "Make New Sample", F4 and F5 are the positions of the up, down, left, and right keys;

[0041] The microwave extraction parameter Reagent is set to:

[0042] (1)HNO 3 ---6ml, HCl---2ml

[0043] (2) Power---800, Ramp---10, Hold---25, Fan---1

[0044] (3) Power---0, Ramp---0, Hold---20, Fan---3

[0045] (4) IR: 210℃, Rate: 0.7bar / ...

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Abstract

The invention discloses a method for detecting the contents of cadmium, lead, mercury and chromium in plastic. The detection method comprises the following steps of (a) processing a sample into particles, wherein the weight of each particle is not greater than 0.2g; (b) adding nitric acid, hydrochloric acid and hydrogen peroxide in the sample after processing in the step (a) and carrying out microwave digestion, wherein the ratio of the sample to the nitric acid is 1 to 30-50g / ml, the ratio of the sample to the hydrochloric acid is 1 to 10-20g / ml, and the ratio of the sample to the hydrogen peroxide is 1 to 5-10g / ml; and (c) after finishing the digestion, taking out a digestion solution, filtering and carrying out ICP-OES (Inductively Coupled Plasma Optical Emission Spectrometer) analysis on the digestion solution. The detection method provided by the invention has the advantages that the analytical method is rapid, the accuracy is high, and the repeatability and reproducibility are good.

Description

technical field [0001] The invention relates to a method for detecting the content of heavy metal elements, in particular to a method for detecting the contents of eight heavy metals such as cadmium, lead, mercury and chromium in plastics. Background technique [0002] Heavy metal elements generally refer to metal elements with an elemental density greater than 4500kg / m3 under standard conditions, which are different from light metal elements (such as aluminum and magnesium). Common heavy metal elements are cadmium (Cd), mercury (Hg), arsenic (As), Cr (chromium), copper (Cu), barium (Ba), lead (Pb), etc. The ions of heavy metal elements are generally toxic. For example, copper is non-toxic, but copper ions denature proteins and are toxic. [0003] Renewable resources are a strategic measure to make up for the shortage of resources in our country. As a measure to save resources and protect the environment, the recycling of waste plastics has been paid more and more attention...

Claims

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Application Information

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IPC IPC(8): G01N21/71G01N1/28
Inventor 王生兵
Owner 昆山洛丹伦生物科技有限公司
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