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Detecting method for contents of cadmium, lead, mercury and chromium in plastic

A detection method and technology of chromium content, applied in the detection of lead, mercury, chromium content, and cadmium in plastics, can solve the problems of toxicity, protein denaturation, etc., achieve good repeatability and reproducibility, high accuracy, and simple detection method Effect

Inactive Publication Date: 2014-06-11
昆山洛丹伦生物科技有限公司
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  • Abstract
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  • 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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  • Detecting method for contents of cadmium, lead, mercury and chromium in plastic

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Experimental program
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Embodiment 1

[0036] (a) Use an electronic balance to weigh 0.2±0.001g of the plastic sample, cut it into particles no larger than 0.2g, and put it into a 100ml beaker;

[0037] (b) Add 5 ml of sulfuric acid (H 2 SO 4 ), covered with a glass watch glass, placed on a heating plate with a temperature above 280°C, and heated for 20-30 minutes to decompose and carbonize the organic components; slowly add 5ml of nitric acid to the beaker to digest and oxidize the sample (repeat this step until sample is completely digested), Note meaning: Risk of splashing due to violent reaction;

[0038] (c) Remove the beaker from the heating plate, let it stand for cooling, then slowly add 10ml of perhydrochloric acid and 10ml of EDTA-2Na solution, heat the beaker on the heating plate, continue to heat until boiling, keep for 3 minutes, remove the beaker from the heating plate , leave to cool for 10 minutes (to room temperature);

[0039] (d) Rinse the beaker and glass watch glass used for pretreatment ...

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Abstract

The invention discloses a detecting method for contents of cadmium, lead, mercury and chromium in plastic. The detecting method comprises the following steps of (a) treating a sample to form particles, wherein the weight of each particle is not larger than 0.2g; (b) adding sulfuric acid into the sample treated in the step (a), heating at the temperature of higher than 250 DEG C for more than 15min, and adding nitric acid into the sample until the sample is completely digested, wherein the ratio of the sample to the sulfuric acid is 1: (15-35)g / ml; (c) stopping heating, standing and cooling, then, slowly adding preoxyhydrochloric acid and an EDTA (Ethylene Diamine Tetraacetic Acid)-2Na solution, continuously heating until the solution is boiled, and keeping the solution boiling for more than 1min, wherein the ratio of the volume of the added preoxyhydrochloric acid to the quantity of the sample is (40-60):1ml / g, and the ratio of the volume of the added EDTA-2Na solution to the quantity of the sample is (40-60):1ml / g; (d) filtering the solution obtained in the step (c), and analyzing by using an ICP-OES (Inductively Coupled Plasma Optical Emission Spectrometer). The analysis method provided by the invention is rapid, high in accuracy and good in repeatability and reproducibility.

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 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. Due to the complexity of...

Claims

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Application Information

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IPC IPC(8): G01N21/73G01N1/28
Inventor 王生兵
Owner 昆山洛丹伦生物科技有限公司
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