Method for determining content of lead in hot melt adhesive

A determination method and technology of lead content, applied in the field of physical and chemical inspection, can solve problems such as low sensitivity, physical hazards and dangers of operators, and achieve accurate detection, accurate detection results, and less interference in the determination process

Active Publication Date: 2012-10-03
CHINA TOBACCO GUANGXI IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The detection of lead content in hot melt adhesives in my country generally adopts the national recommended standard: GB / T 7686-2008 Determination of heavy metal content in organic chemical products Visual colorimetry, this method has low sensitivity and is not suitable for the determination of low-concentration samples, and There are certain dangers in the experiment process, which is harmful to the operator's body

Method used

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  • Method for determining content of lead in hot melt adhesive
  • Method for determining content of lead in hot melt adhesive
  • Method for determining content of lead in hot melt adhesive

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0059]1. Instruments and reagents: PTFE volumetric flask, 50mL. Analytical balance, the sensitivity is 0.0001g. Teflon beaker, 100mL. Airtight microwave digestion instrument (with microwave digestion tank). Temperature controlled electric heater. Graphite Furnace Atomic Absorption Spectrometer. Water, ultrapure water or double distilled water of equivalent purity. Nitric acid (68%), nitric acid (0.2%), hydrogen peroxide (30%), hydrochloric acid (37%), hydrofluoric acid (40%), ammonium dihydrogen phosphate solution concentration is 10g / L, magnesium nitrate solution concentration is 10 / L, lead standard solution.

[0060] 2. Sample treatment: accurately and accurately weigh 0.2 g of hot melt adhesive sample A, place it in a microwave digestion tank, and add a certain volume of nitric acid (68% concentration) and hydrogen peroxide (30% concentration) to the microwave digestion tank. ), hydrochloric acid (concentration is 37%), hydrofluoric acid (concentration is 40%), pack i...

example 2

[0063] As described in Example 1, the hot melt adhesive sample of brand B is selected, and the lead 0.15mg / kg in the sample is measured

example 3

[0065] As described in Example 1, the hot melt adhesive sample of brand C is selected, and the lead in the sample is measured to be 0.09mg / kg

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Abstract

The invention discloses a method for determining the content of lead in hot melt adhesive. The method is characterized in that the content of the lead in the hot melt adhesive can be detected quickly and accurately by measurement through the steps of sample pre-digestion, mixed acid microwave digestion, acid removing and volume metering, standard blank solution preparation, atomic absorption spectroscopy determination of a graphite furnace and the like. According to the method disclosed by the invention, the defects in a sample treatment method in the prior art are overcome; compared with a digestion mode of a traditional electric hot plate, the method disclosed by the invention has the characteristics that due to the adoption of a microwave digestion mode, the usage amounts of the sample and strong acid can be reduced and the digestion capacity is improved; and in addition, the loss of elements of the sample to be determined is less, the harm to an operator is small and easy operation is realized. According to the method, the acid removing process is quick and simple; and the interference is eliminated by adopting a matrix modifier. For the characteristics of hot melt adhesive materials, after relevant temperature-rise programs, ashing temperature and atomization temperature of the optimized atomic absorption spectroscopy are used for determining, high recovery rate and accurate measurement result are obtained.

Description

Technical field: [0001] The invention belongs to the technical field of physical and chemical testing, and in particular relates to a method for determining the content of trace element lead in hot melt adhesives. Background technique: [0002] Lead is a chronic and cumulative poison. Lead is a potential carcinogen to the human body, and different individuals have different sensitivities. As people pay more and more attention to food safety, the safety, sanitation and environmental protection of food packaging materials More and more attention has been paid to it. Harmful components in hot melt adhesives used for packaging food can penetrate into the packaged objects. Among them, lead content, as one of the safety indicators, is now attracting more and more attention at home and abroad. [0003] The detection of lead content in hot melt adhesives in my country generally adopts the national recommended standard: GB / T 7686-2008 Determination of heavy metal content in organic c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/31G01N21/33G01N1/44
Inventor 徐雪芹黄泰松李小兰陈志燕许蔼飞曾德芬王维刚蒋宏霖
Owner CHINA TOBACCO GUANGXI IND
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