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Low-temperature conversion and measurement method of chlorine isotope in chlorohydrocarbon

A chlorine isotope, low temperature conversion technology, applied in the fields of food, environmental protection, medicine, and geology, can solve the problems of difficult to master and high risk factor, and achieve the effect of easy promotion, less interference and low risk factor

Inactive Publication Date: 2014-08-13
CHINA UNIV OF GEOSCIENCES (BEIJING)
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The above-mentioned conversion process requires conversion at a high temperature above 600°C, distillation under high temperature conditions, and needs to be carried out under vacuum conditions. The risk factor of the operation is high and it is difficult to master

Method used

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  • Low-temperature conversion and measurement method of chlorine isotope in chlorohydrocarbon
  • Low-temperature conversion and measurement method of chlorine isotope in chlorohydrocarbon
  • Low-temperature conversion and measurement method of chlorine isotope in chlorohydrocarbon

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Embodiment 1

[0039] The ratio of chlorine isotopes in trichlorethylene (TCE) and tetrachlorethylene (PCE) produced by three different reagent manufacturers (Tianjin Guangfu, Sinopharm and Chromatography) is determined as follows:

[0040] A. Prepare a 10mL derivative bottle, add 2mL of pure water, add 0.03g of ferrous sulfate powder, add 1.5mL of sodium persulfate solution with a concentration of 5g / L, shake well and let stand;

[0041] B. Take 10uL of trichlorethylene (TCE) and tetrachlorethylene (PCE) reagents and inject them below the liquid surface, then add 2.5mL of 1% hydrogen peroxide, quickly cover the derivative bottle cap, and shake evenly;

[0042] C. Place the reaction vessel in an ultrasonic instrument and perform an ultrasonic reaction for 10 hours at a temperature range of 55 degrees. 2.5h, 65°C-1.5h, time-consuming is shorter and the effect is better); then put the reaction vessel in the UV analyzer (Shanghai Anting Electronic Instrument Factory, ZF-2 three-purpose UV analy...

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Abstract

The invention discloses a low-temperature conversion and measurement method of chlorine isotope in chlorohydrocarbon. The method comprises the steps of A. carrying out oxidation dechlorination treatment on organic matters, namely A-1. injecting pure water into a closed reaction vessel, sequentially feeding ferrous sulfate powder and sodium persulfate solution, shaking up, and standing still; A-2. injecting chlorohydrocarbon into the reaction vessel below the liquid level, then feeding hydrogen peroxide, and rapidly covering an airtight cover of the reaction vessel; A-3. putting the reaction vessel into an ultrasonic apparatus, and carrying out an ultrasonic reaction for 5-12 hours within the temperature range of 50-65 DEG C, wherein the power of the ultrasonic apparatus is 750W or higher; and A-4. putting the reaction vessel onto an ultraviolet analyzer, opening short wave and long wave at the same time, and irradiating for more than 3 hours under the power of 25-35W; B. carrying out inorganic chlorine extraction and purification; and C. carrying out ion exchange preparation and thermal ionization mass spectrometry measurement and correction. According to the low-temperature conversion and measurement method, chlorohydrocarbon can be efficiently converted and purified under the lower temperature condition, and the contrast correction of the constant value of the organic monomer chlorine isotope of the chlorohydrocarbon and international SMOC can be finally realized conveniently and speedily.

Description

technical field [0001] The invention relates to a method for testing, comparing and correcting chlorine isotopes in chlorinated hydrocarbons, belonging to the category of organic monomer isotope analysis technology (CSIA), and can be applied to the fields of environmental protection, geology, food, medicine and the like. Background technique [0002] With the continuous deepening of environmental science, earth science, food science and medical research, the new organic monomer isotope technology (CSIA) has become a frontier research hotspot. The use of organic monomer isotope technology (CSIA) can identify and track the source of organic pollution, evaluate the degradation process of organic pollutants and test the effect of control measures, identify the source of major diseases, etc. Trichlorethylene (TCE) and tetrachlorethylene (PCE) are common pollutants in the environment, and it is of great practical significance to develop the test method for its monomer isotope firs...

Claims

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Application Information

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IPC IPC(8): G01N27/62G01N27/626
Inventor 桂建业刘菲陈鸿汉
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)
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