Method for detecting 2-chloro-4 bromophenol in air

Abstract

The invention discloses a method for detecting 2-chloro-4 bromophenol in air. The method comprises the following steps: collecting a sample by use of a Tenax sampling tube and a comprehensive atmosphere sampler, performing thermal desorption on the fed sample, detecting the content of 2-chloro-4 bromophenol in the sampling tube by use of a GC-ECD (Gas Chromatography-Electron Capture Detector) and calculating to obtain the concentration of the 2-chloro-4 bromophenol in the air, wherein the sampling flow rate is 200mL / min and the sampling time is 50min. The method is characterized in that the Tenax sampling tube and the GC-ECD are combined with the collection and detection of the 2-chloro-4 bromophenol in the air, so the operation is simple, no organic solvent is needed for desorption so that the method is safe and environmental friendly, and the adsorption and recovery efficiencies are high.

Description

technical field [0001] The invention relates to the technical field of environmental analytical chemistry, in particular to a method for detecting 2-chloro-4 bromophenol in air. Background technique [0002] The molecular formula of 2-chloro-4-bromophenol is C 6 h 4 BrClO, also known as o-bromo-p-chlorophenol, is a white solid at room temperature, with a melting point of 47-49°C, volatile, with a pungent odor, a boiling point of 233-235°C, and a flash point greater than 110°C, soluble in benzene and toluene , carbon tetrachloride and other solvents. 2-Chloro-4-bromophenol is easily soluble in organic solvents such as chlorobenzene and diethoxymethane, and can be miscible with water, alcohol, and acetic acid. When exposed to air and sunlight, the color will gradually become dark due to free bromine. 2-Chloro-4-bromophenol is mainly used in industry as an intermediate of the ternary asymmetric organophosphorus insecticide profenofos, and can also be used in other organic sy...

AI Technical Summary

Problems solved by technology

The content of 2-chloro-4-bromophenol is an important indicator affecting the quality of profenofos technical. At present, the development of 2-chloro-4-bromophenol in my country is still in its infancy, and the annual demand is several hundred tons, but The actual output is less, the quality is average

[0003] Phenolic compounds are a kind of cell protoplasm poison. Its toxic effect is to chemically react with the protein in the cell protoplasm to form denatured protein and make the cell inactive. The pathological changes it causes mainly depend on the concentration of the poison. It can denature cells and coagulate proteins at high concentrations. Although the local damage at low concentrations is not as serious as high concentrations, at low concentrations, due to its strong penetrating power, it can penetrate into deep tissues, so the consequences are more serious.

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