摘要
推导了改变气液相比静态顶空气相色谱法测定挥发性有机污染物亨利常数的理论关系式．根据顶空气相色谱峰面积倒数与气液相比之间的线性关系测定了不同温度下的氯仿亨利常数值．从热力学定律出发,提出了在２２—１００℃范围内,温度对亨利常数影响的数学关系式:ｌｎＫ＝Ａ＋Ｂ/Ｔ＋ＣｌｎＴ,对实验值的拟合系数为０．９９９．预测１００℃时氯仿的亨利常数值是１．３５９．与实验值比较,相对误差为２．８９%．比经典的范特荷夫方程ｌｎＫ＝Ａ＋Ｂ/Ｔ的预测精度提高了近１０%．
Static headspace method was used to determine Henry's law constant (K) of chloroform. In the static headspace method, K of chloroform was determined from a plot of the linear relationship between reciprocal of gas chromatographic peak area of chloroform (1/PA ) and gas to water phase ratio ( Vg/Vl). Effect of temperature ( T) ranging from 22 to 100 on K of chloroform was stu-died. The equation: lnK = A/T + BlnT + C was fit with correlation of 0.999 for the experimental data obtained in the present study. The equation, comparatively more accuracte than the classical Van't Hoff equation lnK = A/T + C, expressed the relationship between K of chloroform in the water and temperature ranging from 22 to 100℃ . K of chloroform in water predicted by the equa-tion was 1.359 at 100℃ . Compared with experimental values, relative error was 2.89% .
出处
《环境化学》
CAS
CSCD
北大核心
2001年第3期270-274,共5页
Environmental Chemistry
