多环芳烃在盐溶液中盐析常数和活度系数的研究

Studies on Salting-out Constants and Activity Coefficients of Polycyclic Aromatic Hydrocarbons in Aqueous Salt Solutions

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摘要研究盐类对多环芳烃溶解度的影响,不仅涉及盐效应各种理论的研究,而且在化工分离、环境治理上也有重要的实际意义。本文研究了25℃下7种多环芳烃在NaCl水溶液中的活度系数和盐析常数。计算并比较了萘和联苯的盐析常数以及5种多环芳烃在被正辛醇饱和的NaCl水溶液中的活度系数和盐析常数。 The solubilities of polycyclic aromatic hydrocarbons in water as well as in the aqueous NaCl salt solution were determined at 25℃ by spectrophotometer. The activity coefficient and salting-out constants have also been calculated.The salt concentrations (Cs) used are in the range of 0-0. 8 mol . L-1 when lgf values were ploted vs. Cs for each compound, the obtained results are all straight lines. On comparison of slopes of these lines, the salting-out order is 4-methyl biphenyl>biphenyl>Naphthalene>ether>a-methyl naphthalene.

作者王连生徐良基李小娟

机构地区南京大学环境科学系