揮發性有機污染物水中亨利常數的簡易測定方法

摘要： 開發了揮發性有機物亨利常數的簡易實驗測定方法,并以此方法測定了5種汽油成分(甲基叔丁基醚(MTBE)、苯、甲苯、乙苯、鄰二甲苯)的亨利常數,相對標準偏差基本上在5%以內.使用此方法測定的汽油成分、硝基苯、2,4-二氯酚、苯酚和三氯乙烯(TCE)的亨利常數數值比估算值更接近文獻值.在不同溫度下,使用本方法對MTBE、苯、甲苯、TCE溶液進行測定,結果表明亨利常數隨著溫度的升高而變大,符合亨利常數隨溫度變化趨勢的一般規律.兩種揮發性有機物在混合條件下的亨利常數比單獨存在時的亨利常數大. Abstract： A simple and fast experimental method for estimating the Henry's law constant (HLC) of a volatile organic compound (VOC) in water samples was developed; it required only the equilibrium liquid phase concentration of a close system partially filled with the VOC solution for calculating its HLC of the test conditions. The simple experimental method was highly reproducible; its relative standard derivations(RSDs) for 5 minor gasoline constituents (MTBE, benzene, toluene, ethyl benzene, o-xylene) were less than 5%. Compared with the HENRYWIN calculations, the experimental HLCs of those VOCs,nitrobenzene, and trichloro ethylene (TCE) were all in better agreements with most experimental values reported in the two USEPA databases and the literature. The method was utilized for estimating HCL of different solution temperatures and composition. HLC of MTBE, benzene, toluene and TCE increased as the temperature went up and that they were higher in the bisolute solutions with greater effect noted due to presence of a more soluble coexisting VOC. 作 者： 呂燕    張巍    黃流雅    林匡飛    應維琪    L(U) Yan    ZHANG Wei    HUANG Liu-ya    LIN Kuang-fei    YING Wei-chi   作者單位： 華東理工大學資源與環境工程學院,上海,200237  期 刊： 華東理工大學學報（自然科學版）  ISTICPKU   Journal： JOURNAL OF EAST CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY(NATURAL SCIENCE EDITION)  年，卷(期)： 2009, 35(6)  分類號： X131  關鍵詞： 亨利常數    溫度    溶解度    揮發性有機物    甲基叔丁基醚    Keywords： Henry's constant    temperature    solubility    volatile organic compound    MTBE   

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