Problems and Suggestions of GB/T 5750.8-2023 for Determination of Chloroform and Carbon Tetrachloride in Drinking Water by Headspace-Gas Chromatography
The factors affecting the quantitative accuracy of GB/T 5750.8-2023 for the determination of chloroform and carbon tetrachloride in drinking water by headspace-gas chromatography,such as split ratio,chromatography column,matrix blank and standard curve preparation,etc.,were discussed. And the conditions were optimized by combining with the 7697A headspace autosampler,the 7890B gas chromatograph and the DB-1701 quartz capillary column (30 m×0.25 mm×0.25 μm). The method was confirmed by the optimized experimental conditions,and the linearities of chloroform and carbon tetrachloride were good in the range of 0.1～10.0 μg/L and 0.01～1.0 μg/L,respectively. The limits of detection were 0.025 and 0.0020 μg/L,the limits of quantification were 0.083 and 0.0067 μg/L,respectively. And the correlation coefficients were greater than 0.999,the relative standard deviations were 4.2％～6.5％ and 1.8％～4.0％,and the recoveries were 96.8％～102.5％ and 104.0％～107.2％,respectively. The optimized method can meet the requirements for the determination of chloroform and carbon tetrachloride in drinking water,and provide a reference for the testing of trichloromethane and carbon tetrachloride in water.
万方数据
