Measuring eleven kinds of chlorobenzenes and hexachlorobutadiene in drinking water by HS-GC

ObjectiveTo apply the HS-GC method to measure eleven kinds of chlorobenzenes and hexachlorobutadiene in drinking water.

MethodsWe put 10mL water sample into a 20 mL vial containing 2.5 g sodium chloride. The vial was stirred at 80℃ for 15 mins prior to headspace sampling. Eleven kinds of chlorobenzenes were separated completely by Rtx-1 701 capillary column(30.00 m×0.25 mm×0.25 μm), detected by electron capture detectors.

ResultsThe linearity of the method ranged from 1.00-32.00 μg/L, 0.20-6.40 μg/L, 0.05-1.60 μg/L, 0.02-0.64 μg/L, 0.02-0.64 μg/L and 0.01-0.32 μg/L for dichlorobenzene isomers, trichlorobenzene isomers, tetrachlorobenzene isomers, pentachlorobenzene, hexachlorobenzene and hexachlorobutadiene. In case of a 10 mL water sample, the lowest detected range of mass concentration was 0.001 62-0.262 00 μg/L. The additional standard recovery rate of finished water samples was in the range of 80%-119% with the relative standard deviation (RSD) in the range of 2.24%-4.99%.

ConclusionThis method is simple, fast, sensitive and needs no organic solvents. It is suitable for measuring both chlorobenzene compounds and hexachlorobutadiene in drinking water simultaneously.