Method for detecting alpha-1, 2, 3, 4, 5, 6-hexachlorocyclohexane and dichlorodiphenyltrichloroethane in soil

Abstract

The invention relates to the technical field of environmental detection, in particular to a method for detecting alpha-1, 2, 3, 4, 5, 6-hexachlorocyclohexane and dichlorodiphenyltrichloroethane in soil. In sample pretreatment and purification processes of the method, an operation using rotary steaming and a solid phase extraction column is adopted to completely replace concentrated sulfuric acid;the concentrated sulfuric acid is not utilized in the whole purification process, and the sample consumption is low during the detection; furthermore, the operation steps are relatively simple, and the batch experiment efficiency is high; compared with the national standard GB / T14550-2003, the recovery rates of the alpha-1, 2, 3, 4, 5, 6-hexachlorocyclohexane and the dichlorodiphenyltrichloroethane are in the same level range; when the detection method provided by the invention is used, the relative standard deviation is within a range of 2.6-8.3%; when a detection method in the national standard GB / T14550-2003 is used, the relative standard deviation is within a range of 1.6-9.0%, so that the relative standard deviation of the detection method provided by the invention is significantly smaller than that of the detection method in the national standard GB / T14550-2003; therefore, the detection method provided by the invention is reliable in measured results.

Description

technical field [0001] The invention relates to the technical field of environmental detection, in particular to a method for detecting BHC and DDT in soil. Background technique [0002] Six six six (α-1,2,3,4,5,6-Hexachlorocyclohexane) also known as hexachlorocyclohexane, molecular formula C 6 h 6 Cl 6 , Stable to acid, easy to decompose in alkaline solution or in the presence of zinc, iron, tin, etc., long-term damp or sunlight will fail. Chemical Structure: [0003] [0004] DDT (Dichlorodiphenyltrichloroethane) also known as dichlorodiphenyltrichloroethane chemical formula is (ClC 2 h 4 ) 2 CH(CCl 3 ), can be used to prevent agricultural diseases and insect pests, as well as malaria typhoid and other diseases transmitted by mosquitoes and flies. Chemical Structure: [0005] [0006] 666 is a spectrum insecticide that acts on the nerves of insects. It also has stomach poisoning, contact killing, and fumigation effects. Due to its wide application, easy manu...

AI Technical Summary

Problems solved by technology

[0009] At present, the detection of HCH and DDT in soil is based on the national standard GB / T 14550-2003 "Gas Chromatography for the Determination of HCH and DDT in Soil". The purification step in the pretreatment method needs to be purified repeatedly with concentrated sulfuric acid. Gas and heat are generated during the purification process, which is easy to explode, and is a precursor reagent. Concentrated sulfuric acid is a controlled drug, and its purchase volume is greatly restricted. For institutions with a large detection volume, the original concentrated sulfuric acid is used. The method of purification will bring the risk of lagging detection work, which will bring great restrictions to the detection work

At the same time, when the original sample purification method is used for detection, the sample consumption in the detection process is relatively large, and the operation steps are relatively cumbersome, and the efficiency of batch experiments is not high.

Images