GC Determination of Benzene Homologues,Acetonitrile and Acrylonitrile in Water with Head-space Sample Introduction

In the simultaneous GC determination of benzene homologues,acetonitrile and acrylonitrile in water samples,the DB-WAX capillary chromatographic column was used and satisfactory separation was attained.Five mL of water sample was placed into a sealedhead-space sample bottle,and equilibrated in the automatic head-space sampler at 80 ℃ for 6 min.Linear relationships between values of peak area and mass concentration of the analytes were obtained in the ranges of 0.01-0.10 mg·L-1 for the benzene homologues,0.20-2.00 mg·L-1 for acetonitrile and 0.10-1.00 mg·L-1 for acrylonitrile.External standard method was adopted in the determination .Detection limits (3S/N) of the method were in the range of 0.7 to 19.8 μg·L-1 separately for the 10 compounds determined.Recovery and precision of the method were tested by standard addition method using a blank water sample as matrix.Values of recovery and RSD′s (n=6) found were in the ranges of 97.3%-104.8% and 2.17%-4.24% respectively.