水体中氯苯类有机物的水蒸气顶空富集：化合物正辛醇/水分配系数及蒸气压的影响  

Vapor Dynamic Headspace Enrichment of the Chlorobenzenes in Water: Effects of n-Octanol/Water Partition Coefficient and Saturated Vapor Pressure

作　　者：郭远明[1,2] 胡红美[1] 金衍健[1] 钟志[1] 陈雪昌[1] 马慧莲[3] 孙秀梅[1] 

机构地区：[1]浙江省海洋水产研究所,浙江省海水增养殖重点实验室,浙江舟山316021 [2]浙江海洋学院海洋与渔业研究所,浙江舟山316022 [3]中国科学院大连化学物理研究所,辽宁大连116023

出　　处：《浙江海洋学院学报（自然科学版）》2015年第4期344-349,共6页Journal of Zhejiang Ocean University(Natural Science Edition)

基　　金：国家自然基金项目(21407127);浙江省公益性分析测试科技计划项目(2013C37088)

摘　　要：讨论了蒸汽顶空富集时,水中目标有机物的回收率与正辛醇/水分配系数和蒸气压之间的联系,结果表明氯苯类挥发性有机污染物在水中的回收率与正辛醇/水分配系数(lg Kow)间存在一定的规律:当lg Kow值<5.5时,回收率随lg Kow值的增大而增大;当lg Kow值>5.5时,回收率随lg Kow值的增大而降低。回收率与1.0 k Pa蒸气压温度的关系分析可以得出相似的规律,回收率值有一个拐点,当1.0 k Pa蒸气压温度<120℃时,回收率随着有机物蒸气压增大而增大,1.0 k Pa蒸气压温度>120℃时,回收率反而随着有机物蒸气压增大而降低。氯苯类有机物的回收率既与有机物的lg Kow值、蒸气压正相关,又受到lg Kow值、蒸气压的制约。This study aims at getting the relationship between volatile organic pollutants＇ recoveries of vapor dynamic headspace enrichment in water and their n-oetanol/water partition coefficients （lgKow）, saturat- ed vapour pressure. The results showed that, the volatile organic pollutants＇ recoveries in water and their n- oetanol/water partition coefficients （lgKow） has the following contact： when lgKow 〈5.5, the recoveries of chlorobenzenes were increased with the increase of lgKow, and when lgKow〉5.5, the recoveries of chloroben- zenes were decreased with the increase of lgKow. In the same way, a study on the relationship between the re-coveries of chlorobenzenes in water and saturated vapour pressure was also carried out. The results showed a similar pattern. When the temperature 〈120 ℃ at 1.0 kPa vapour pressure, the recoveries of chlorobenzenes were increased with the increase of temperature, and when the temperature 〈120 ℃at 1.0 kPa vapour pres- sure, the recoveries of chlorobenzenes were decreased with the increase of temperature. From the above, there was a positive correlation between the recoveries of chlorobenzenes and their lgKow, saturated vapour pressure, while the recoveries of chlorobenzenes were also constrained by these two factors. Thus, the recoveries of chlorobenzenes in water depend on the integrative influence of lgKow and saturated vapour pressure.

关 键 词：氯苯类化合物 回收率 正辛醇/水分配系数 蒸气压 

分 类 号：O657.63[理学—分析化学]