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Determination method of arsenic content in hot melt glue

A measurement method, hot-melt adhesive technology, applied in the field of physical and chemical inspection, can solve the problems of cumbersome operating procedures, low sensitivity, and great physical harm to operators, and achieve accurate detection results, accurate detection, and less interference in the measurement process

Inactive Publication Date: 2012-09-26
CHINA TOBACCO GUANGXI IND
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  • Abstract
  • Description
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Problems solved by technology

[0003] In my country, the detection of arsenic content in hot melt adhesives generally adopts the national recommended standard: GB / T 7686-2008 General method for the determination of arsenic content in chemical products. This method has cumbersome operating procedures and low sensitivity, and is not suitable for the determination of arsenic in batch samples. In addition, the reagents used in the experiment are highly toxic and harmful to the operators.

Method used

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  • Determination method of arsenic content in hot melt glue
  • Determination method of arsenic content in hot melt glue
  • Determination method of arsenic content in hot melt glue

Examples

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specific Embodiment approach

[0057] The present invention will be further described below in conjunction with example, but not limit the present invention:

[0058] A method for determining arsenic in hot-melt adhesives. The testing process is to digest a weighed hot-melt adhesive sample with mixed acid, dissolve it with 0.2% nitric acid, and set the volume to a certain volume. Take an appropriate amount of sample liquid and collective improver in the graphite furnace atomizer, after drying, ashing, and atomization, under the selected parameters, the arsenic absorption wavelength of the element to be measured is the resonance line of 193.7nm, and its absorbance is the same as that of arsenic The content is directly proportional, and it is quantitative compared with the standard series.

example 1

[0060]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, 1.0g / L palladium nitrate solution, 10 / L, arsenic standard solution

[0061] 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 into microwave digestion instrument af...

example 2

[0064] As described in Example 1, the hot melt adhesive sample of brand B is selected, and the arsenic in the sample is measured to be 0.06mg / kg

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Abstract

The invention discloses a determination method of arsenic content in hot melt glue. The method is characterized in that the arsenic content in hot melt glue is determined by adopting the steps of sample predigestion, mixed acid microwave digestion, cast acid constant volume, graphite furnace atomic absorption spectrometer and the like, the arsenic content in hot melt glue can be rapidly and accurately detected. The determination method of arsenic content in hot melt glue provided by the invention overcomes the defects of the sample processing method in the prior art, compared with the traditional digestion mode of the electric hot plate, the using quantity of samples and strong acid can be reduced by adopting a microwave digestion mode, the digestion capability is improved, the loss of the sample to-be-determined element is less, the damage to operating personnel is tiny, and the method is easy to operate; by the method, the cast acid process is rapid and simple, and interference is eliminated by adopting a base body improving agent; and aiming at the material characteristics of hot melt glue, after by adopting the determination of the warming procedure, the ashing temperature and atomic temperature relative to the optimized atomic absorption spectrum method, the recycling rate is high, and the determination result is accurate.

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 arsenic in hot melt adhesives. Background technique: [0002] Arsenic belongs to metalloids and is one of the most concerned pollutants. Its simple substance is insoluble in water in the environment and has no toxicity, but it is easily oxidized into highly toxic arsenic trioxide (arsenic), which can cause rapid death. Human carcinogens. As people pay more and more attention to food safety issues, the safety, sanitation and environmental protection of food packaging materials are getting more and more attention from all aspects. Harmful components in hot melt adhesives used for packaging food can penetrate into the packaged objects Among them, arsenic content, as one of the safety indicators, is now attracting more and more attention at home and abroad. [0003] In my country, the detection ...

Claims

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Application Information

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IPC IPC(8): G01N21/33G01N1/44
Inventor 许蔼飞黄泰松李小兰陈志燕徐雪芹曾德芬王维刚蒋宏霖
Owner CHINA TOBACCO GUANGXI IND
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