摘要 : The use of pervaporation as an alternative to headspace is proposed, using as an example the determination of three chlorinated solvents (i.e., chloroform, carbon tetrachloride and trichloroethene) in solid samples. For this purpo... 展开 The use of pervaporation as an alternative to headspace is proposed, using as an example the determination of three chlorinated solvents (i.e., chloroform, carbon tetrachloride and trichloroethene) in solid samples. For this purpose, a pervaporation module has been coupled to a gas chromatograph equipped with a Ni-63 electron-capture detector. The assembly was provided with a HPLC injection valve, whose location enabled two operation modes to be implemented: with and without preconcentration. When no preconcentration was carried out, the detection limits were 17.4 ng/g for CHCl3,, 14.0 ng/g for CCl4 and 182.6 ng/g for C2HCl3, whereas when the analytes were preconcentrated on the sorbent column, the detection limits decreased to 0.98 ng/g, 0.50 ng/g and 4.42 ng/g, respectively. The proposed method was applied to soil matrices with good recovery and precision. (C) 1997 Elsevier Science B.V 收起