Activity coefficients of the binary liquid mixtures, benzene-toluene and acetone-chloroform were determined using thermal desorption modulation for direct headspace sampling into capillary gas chromatograph. 本文采用热解吸调制器作毛细管气相色谱(GC)接顶空进样测定二元液体混合物苯-甲苯和丙酮-氯仿的活度系数。