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Method of directly detecting content of mercury in solid rubber by means of mercury detector

A solid rubber and rubber technology, applied in the direction of measuring devices, test sample preparation, instruments, etc., can solve the problems of cumbersome and time-consuming atomic fluorescence spectrometry steps, increased time and labor costs, environmental and laboratory personnel health hazards, etc. , to achieve the effects of reducing time and labor costs, fast detection speed, and ensuring accuracy

Inactive Publication Date: 2018-06-29
CHEM MINERALS & METALLIC MATERIALS INSPECTION CENT OF TIANJIN ENTRY EXIT INSPECTION & QUARANTINE BUREAU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The determination of mercury content in rubber and its products is usually carried out by microwave digestion-atomic fluorescence spectrometry. This method has high detection sensitivity and low detection limit. However, due to the volatilization of mercury, it is difficult to completely digest the rubber, and it is easy to cause low results.
The steps of atomic fluorescence spectrometry are cumbersome and time-consuming. A special microwave digestion instrument is required in the pretreatment microwave digestion process. Chemical reagents such as hydrogen peroxide, nitric acid, hydrochloric acid, potassium borohydride, and potassium hydroxide are used in the experimental process, which not only increases the detection cost Time cost and labor cost also caused certain harm to the environment and the health of experimenters, so it is necessary to explore a method for quickly, accurately and effectively determining the mercury content in rubber and its products

Method used

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  • Method of directly detecting content of mercury in solid rubber by means of mercury detector
  • Method of directly detecting content of mercury in solid rubber by means of mercury detector
  • Method of directly detecting content of mercury in solid rubber by means of mercury detector

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The first step is to take about 100g samples from different parts of the solid rubber sample and mix them with an open rubber mixer, and then cut the samples to small fragments less than 2.0mm×2.0mm in size to ensure their representativeness.

[0030] In the second step, before the sample test, run the instrument dry to perform a method blank test until the absorbance value is less than 0.003 to remove the mercury residue in the instrument.

[0031] The third step is to weigh 0.03g of the rubber sample after mixing, accurate to 0.1mg, and evenly spread it in the sample boat, place the sample boat in the automatic sample tray, in the computer software system connected to the mercury meter Enter the sample weight;

[0032] Set and select the working conditions of the instrument: drying temperature 350 ℃, time 30 s, purge time 30 s, analysis time 12 s, reading time 24 s, oxygen pressure 0.45Mpa;

[0033] Set the decomposition conditions of the sample: the decomposition time of the...

Embodiment 2

[0036] The first step is to take about 100g samples from different parts of the solid rubber sample and mix them with an open rubber mixer, and then cut the samples to small fragments less than 2.0mm×2.0mm in size to ensure their representativeness.

[0037] In the second step, before the sample test, run the instrument dry to perform a method blank test until the absorbance value is less than 0.003 to remove the mercury residue in the instrument.

[0038] The third step is to weigh 0.05g of the rubber sample after mixing, accurate to 0.1mg, and spread it evenly in the sample boat, place the sample boat in the automatic sample tray, in the computer software system connected to the mercury meter Enter the sample weight;

[0039] Set and select the working conditions of the instrument: drying temperature 350 ℃, time 30 s, purge time 30 s, analysis time 12 s, reading time 24 s, oxygen pressure 0.45Mpa;

[0040] Set the decomposition conditions of the sample: the decomposition time of the...

Embodiment 3

[0043] Weigh 0.07 g of the rubber sample after mixing, and other conditions and steps are the same as in Example 1.

[0044] After the experiment, the software system gave the mercury content determination result of 0.135 mg / kg according to the standard curve.

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Abstract

The invention relates to a method of directly detecting content of mercury in solid rubber by means of a mercury detector. The method includes steps of: setting working conditions of the mercury detector as follows: drying temperature is 350 DEG C, drying time is 30 s, purging time is 30 s, analysis time is 12 s, reading time is 24 s, and oxygen pressure is 0.45 MPa; sample weight of a rubber sample is 0.03-0.15 g to the accuracy of 0.1 mg, sample decomposition time is 1-4 min, and sample decomposition temperature is 550-750 DEG C; then clicking start to detect the sample; after the detectionis finished, reading the detection result of content of mercury in the solid rubber. The method is high in detection speed and is free of pretreatment of the sample, allows direct detection and has simple operation, can avoid volatilization loss during sample treatment and guarantee accuracy of the results, can reduce damage on environment and body health, and is suitable for large-scale analysison the smaple and direct detection of a solid sample of a complex substrate, and has extensive application prospect.

Description

Technical field [0001] The invention provides a method for directly measuring the mercury content in solid rubber by using a mercury measuring instrument, which is used for the determination of the mercury content in solid rubber. Background technique [0002] Mercury is a heavy metal that the state focuses on and restricts. Mercury is very toxic. Even low levels of exposure can cause serious harm to the human nervous system, cardiovascular system and reproductive system. Rubber and its products are widely used in national production and daily life. Affected by the growth environment and production conditions, its products may contain mercury, which affects its safety. Therefore, testing the mercury content in rubber and its products is important for protecting the environment and the people. The health of the masses is of great significance. [0003] Existing technologies for the determination of mercury content in rubber and its products mostly use microwave digestion-atomic flu...

Claims

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Application Information

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IPC IPC(8): G01N33/44G01N1/28
CPCG01N1/286G01N33/445
Inventor 姚毅荣王堃魏秉炎王海仙杨丽飞陈广志
Owner CHEM MINERALS & METALLIC MATERIALS INSPECTION CENT OF TIANJIN ENTRY EXIT INSPECTION & QUARANTINE BUREAU
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