GC-MS Determination of Volatile Halohydrocarbons in City Drinking Water with Purge and Trap Sample Concentrator

Eleven volatile halohydrocarbons in water sample were enriched by the purge and trap sample concentrator,separated by GC and determined by MS under the mode of SIM. Ranges of linearity of the halohydrocarbons determined were obtained from 0.04 to 11.0 μg·L-1 besides chloroform. Detection limits (S/N=3) were found to be less than 6 pg·L-1. Recovery and precision of the method were tested,giving values of recovery in the range of 85.6%-126.1%,and values of RSD′s (n=7) in the range of 2.06%-3.87%.