Key Laboratory of Biogeology and Environmental Geology of Ministry of Education and School of Environmental Studies, China University of Geosciences, Wuhan 430074, China.
Chemosphere. 2010 Jan;78(4):382-8. doi: 10.1016/j.chemosphere.2009.11.009. Epub 2009 Dec 14.
This study aimed to investigate the sources and distribution of phthalate esters (PAEs) in alluvial sediment of humid climate regions where water cycle is very active in order to reveal their behavior of transport from topsoil and/or surface water to deep sediment and groundwater. Topsoil and deeper sediment samples were collected from nine and seventeen sites in July 2007, and January 2008, respectively, from the eastern part of JiangHan Plain, Central China. On each site, samples were collected at every 20-40cm depth within the sediment profiles. Contents of 16 PAEs were detected for each sample. summation operator(16)PAEs contents in the topsoil ranged from 252.6 to 2515.7ngg(-1), with an average value of 926.8ngg(-1). Di(2-ethylhexyl) phthalate (DEHP), di-isobutyl phthalate (DiBP), di-n-butyl phthalate (DnBP), and diethyl phthalate (DEP) were the dominant PAE species. The horizontal distribution of PAEs was related to time (season), cultivation type, distance and exact position from surface water. DEP existed only on the upper layer of soil due to its rapid degradation. However, DEHP, DnBP, and DiBP could be transported downward into deep sediment even though large amount of them were lost due to biodegradation and adsorption. On the other hand, DEHP, DnBP, and DiBP could be transported into deep sediment along with the horizontal flow of shallow groundwater from surface water, such as Yangtze River, Hanjiang River, and Honghu Lake.
本研究旨在调查在水循环非常活跃的湿润气候区冲积沉积物中邻苯二甲酸酯（PAEs）的来源和分布，以揭示其从上覆土壤和/或地表水向深部沉积物和地下水迁移的行为。2007 年 7 月和 2008 年 1 月，分别在华中江汉平原东部的 9 个和 17 个地点采集了表层土和深层沉积物样品。在每个地点，在沉积物剖面上每隔 20-40cm 深度采集样品。对每个样品检测了 16 种 PAEs 的含量。表层土中 16 种 PAEs 的含量范围为 252.6 至 2515.7ngg(-1)，平均值为 926.8ngg(-1)。邻苯二甲酸二（2-乙基己基）酯（DEHP）、邻苯二甲酸二异丁酯（DiBP）、邻苯二甲酸二正丁酯（DnBP）和邻苯二甲酸二乙酯（DEP）是主要的 PAE 物质。PAEs 的水平分布与时间（季节）、种植类型、距离和距地表水的具体位置有关。由于 DEP 快速降解，仅存在于土壤的上层。然而，DEHP、DnBP 和 DiBP 即使由于生物降解和吸附而大量损失，也可以向下迁移到深部沉积物中。另一方面，DEHP、DnBP 和 DiBP 可以沿着从地表水（如长江、汉江和洪湖）流动的浅层地下水的水平流动进入深部沉积物。
