Determination of Chloroform and Carbon Tetrachloride in Drinking Water by Headspace Gas Chromatography

Determination of Chloroform and Carbon Tetrachloride in Drinking Water by Headspace Gas Chromatography
This Law applies to the determination of chloroform and carbon tetrachloride in drinking water and its source water.

Halogenated hydrocarbons in drinking water are mainly by-products of chlorination, and their health effects have received extensive attention. In recent years, studies have found that certain halogenated hydrocarbons in drinking water have mutagenicity and carcinogenicity. National Standard "GB 5749-2006 Hygienic Standard for Drinking Water" At present, tap water in China uses chlorine disinfection method. Chlorine can effectively kill viruses and bacteria in water, but at the same time, some organic pollutants, especially some algae polluted water sources. After chlorination, a series of large amounts of halogenated hydrocarbons are produced. In recent years, the carcinogenic effects of chlorinated by-products in drinking water and their effects on human health have attracted more and more attention and received wide attention from society.

The most common of these halogenated hydrocarbon compounds are four types: chloroform, carbon tetrachloride, trichloroethylene, and tetrachloroethylene.

Detection of chloroform carbon tetrachloride residues in drinking water:

Chloroform and carbon tetrachloride in water can be analyzed by gas chromatography-gas-liquid equilibrium method, which is accurate, sensitive and simple.
Headspace chromatography is suitable for the determination of chloroform and carbon tetrachloride in drinking water and its source water.
The common substances in the water sample do not interfere with the measurement method within the general content range.
The lowest detection concentration is 10ug/L chloroform and 1ug/l carbon tetrachloride.

HS-GC conditions:
Column chamber: 70 ° C
Gasification chamber: 200 ° C
Detector: 230 ° C
Pre-column pressure: 0.08Mpa
Split ratio: 20:1
Supplemental gas: N2, pressure 0.05Mpa
Headspace bottle temperature: 60 ° C
Balance time: 30min
Transmission tube temperature: 85 ° C
Quantitative ring temperature: 80 ° C
Injection volume: 1ml
Pressurization time: 0.3min

Instrument configuration list:

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