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论文类型：期刊论文

发表时间：2011-02-01

发表刊物：SOIL & SEDIMENT CONTAMINATION

收录刊物：Scopus、EI、SCIE

卷号：20

期号：2

页面范围：221-233

ISSN号：1532-0383

关键字：critical separate phase concentration (CSPC); critical separate phase temperature (CSPT); soil; air partition coefficient (KSA); oil; air partition coefficient (Koilair)

摘要：The soil/air partition coefficients (KSA) for hexachlorobenzene (HCB) in oil-contaminated (crude oil and diesel) rice paddy field soils were measured in a solid fugacity meter at different oil concentrations over the temperature range of 5 to 30 degrees C at 100% relative humidity. The results showed that values of KSA increased with a decrease of temperature. As for oil content, there is a critical separate phase concentration (CSPC) above which KSA increased with increasing of oil content. When oil content is above CSPC, oil plays a role as a separate phase that enhances the sorption capacity of the soil. At a given temperature (20 degrees C) values of CSPC depended on the natural organic matter (NOM) contents of the soil, while for a given oil concentration they depended on the temperature. The normalized oil/air partition coefficients [image omitted]) for HCB deduced from KSA for oils and experimentally determined with crude oil/quartz sand system were similar and 0.7-7 times higher than the normalized organic/air partition coefficient [image omitted]), which implied that oil was a super sorbent. The enthalpies (HSA) for crude oil and diesel were 64.9 and 55.7 kJ mol-1, respectively.