GC Determination of 11 Chlorobenzenes in Aquaculture Water with Static Headspace

GC was applied to the determination of 11 chlorobenzenes in aquaculture water with static headspace. The optimum experimental conditions found were to put 10 mL water sample containing 200 g·L-1 sodium chloride in a 20 mL vial and stir at 70 ℃ for 30 mins. 11 chlorobenzenes were separated completely by DB-35 MS capillary column (30 m×0.25 mm, 0.25 μm), detected by electron capture detector and then quantify through external standard method or standard addition method. The linearity of the method ranged from 0.16 to 8.0 μg·L-1 for dichlorobenzene isomers, 0.017 6-0.88 μg·L-1 for trichlorobenzene isomers, 0.004-0.2 μg·L-1 for tetrachlorobenzene isomers and from 0.001 to 0.05 μg·L-1 for pentachlorobenzene and hexachlorobenzene. The limits of detection ranged from 0.0002 to 0.04 μg·L-1. The proposed method was used in the analysis of aquaculture water samples, giving values of recovery and RSD′s (n=5)in the ranges of 86.0%-106% and 2.1%-5.8% respectively.