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首页> 外文期刊>Environmental toxicology and chemistry >MODELING POLYCYCLIC AROMATIC HYDROCARBON COMPOSITION PROFILES OF SOURCES AND RECEPTORS IN THE PEAR RIVER DELTA, CHINA
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MODELING POLYCYCLIC AROMATIC HYDROCARBON COMPOSITION PROFILES OF SOURCES AND RECEPTORS IN THE PEAR RIVER DELTA, CHINA

机译：中国梨河三角洲源和受体的多环芳烃组成特征模型

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摘要

Changes in concentration profiles of polycyclic aromatic hydrocarbons (PAHs) from emission sources to various environmental media in the Pearl River Delta, China were investigated using fugacity modeling under steady state assumption. Both assumed evenly and observed unevenly distributed PAH moles emission profiles were applied. Applicability of the fugacity model was validated against the observed media PAH concentrations and profiles. At equal emission rates, the differences of media concentrations among various PAHs were as high as three (air) to seven (soil and sediment) orders of magnitude. Dramatic changes of PAH profiles from emission sources to various bulk environmental media also were demonstrated by using the actual emission rates. In general, the fractions of higher molecular weight PAHs in air and water were much lower than those at the emission sources, although the PAH profiles in soil and sediment were characterized by a significant reduction of lower molecular weight PAHs. It is likely that the field-measured median concentration profiles cannot be adopted directly for source apportionment without rectification. The most influential parameters affecting PAH profiles in the study area were emission rates, degradation rates, adsorption coefficient, Henry's law constant, PAH concentrations in upstream surface water, fugacity ratio, vapor pressure, and diffusion coefficient in air.
机译：在稳态假设下，使用逸度模型研究了珠江三角洲从排放源到各种环境介质的多环芳烃浓度分布的变化。均假设均匀且观察到不均匀分布的PAH摩尔排放曲线。针对观察到的介质PAH浓度和分布图验证了逸度模型的适用性。在相等的排放速率下，各种多环芳烃之间的介质浓度差异高达三个（空气）至七个（土壤和沉积物）数量级。通过使用实际排放速率，还证明了PAH分布从排放源到各种散装环境介质的剧烈变化。通常，空气和水中高分子量PAHs的比例远低于排放源，尽管土壤和沉积物中PAH的特征是低分子量PAHs的显着降低。未经校正，现场测量的中值浓度分布可能无法直接用于源分配。在研究区域中影响PAH分布的最有影响力的参数是排放速率，降解速率，吸附系数，亨利定律常数，上游地表水中PAH浓度，逸度比，蒸气压和空气中扩散系数。

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