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论文类型：期刊论文

发表时间：2009-07-01

发表刊物：CHEMOSPHERE

收录刊物：SCIE、EI、PubMed

卷号：76

期号：4

页面范围：465-471

ISSN号：0045-6535

关键字：Soil/air partition coefficient; Polycyclic aromatic hydrocarbons (PAHs); Organochlorine pesticides (OCs); Temperature-dependence

摘要：The soil/air partition coefficients (K(SA)) for two polycyclic aromatic carbons (PAHs) and six organochlorine pesticides (OCs) were determined by a solid-phase fugacity meter over a wide temperature range of -30 to +30 degrees C in a paddy field soil. Literature values for PAHs and OCs obtained by the same method were 1.9-5.1 times of present values at +20 degrees C. Experimentally determined KSA ranged over six orders of magnitude, with log K(SA) from 4.5 for alpha-hexachlorocyclohexane at +30 degrees C to 10.4 for trans-nonachlor at -20 degrees C. Separate linear regressions of log KSA and reciprocal absolute temperature were employed at temperatures above 0 degrees C and below 0 degrees C. The calculated enthalpies associated with the phase transfer from the soil to the air (Delta H(SA)) over 0 to +30 degrees C range from 78 to 108 kJ mol(-1), which are in a good agreement with the literature values. (C) 2009 Elsevier Ltd. All rights reserved.