International Joint Research Center for Persistent Toxic Substances, College of Biological and Environmental Engineering, Zhejiang University of Technology, Hangzhou 310032, China.
J Hazard Mater. 2013 Mar 15;248-249:142-9. doi: 10.1016/j.jhazmat.2012.12.057. Epub 2013 Jan 7.
Phthalate esters (PAEs), a group of emerging organic contaminants, have become a serious issue arousing much attention for their ubiquitous presence and hazardous impact on the environment. This study provides the first data on distribution of PAEs in the sediments in the Qiantang River, Zhejiang Province, China, and the inference with urbanization and river flow regime. PAEs were detected in all 23 sediment samples analyzed, and the total concentrations of their 16 congeners in sediments ranged from 0.59 to 6.74μg/g dry weight (dw), with the geometric mean value of 2.03μg/g dw. Of the 16 PAE congeners, di-n-butyl phthalate (DnBP), diisobutyl phthalate (DiBP), and di(2-ethylhexyl) phthalate (DEHP) were present in all sediment samples. The PAEs concentrations in urban regions were higher than those in rural regions because of higher discharge of PAEs from plastic materials in urbanized areas. Concentrations of PAEs were positively correlated with sediment organic matter (fOM) and negatively correlated with logistic value of annual average flow volume at sample sites. River flow regime modified by man-made dams significantly affected the distribution of PAEs. Analysis of congener composition of PAEs indicated that the DEHP was predominant congener in the Qiantang River. The normalized concentration of DEHP exceeded recommended environmental risk limit (ERL).
邻苯二甲酸酯（PAEs）作为一组新兴的有机污染物，因其普遍存在和对环境的危害而成为一个严重的问题。本研究首次提供了中国浙江省钱塘江沉积物中 PAEs 的分布数据，并与城市化和河流流量状况进行了推断。在所分析的 23 个沉积物样本中均检测到了 PAEs，其 16 种同系物在沉积物中的总浓度范围为 0.59 至 6.74μg/g 干重（dw），几何平均值为 2.03μg/g dw。在 16 种 PAE 同系物中，二正丁基邻苯二甲酸酯（DnBP）、二异丁基邻苯二甲酸酯（DiBP）和邻苯二甲酸二（2-乙基己基）酯（DEHP）存在于所有沉积物样本中。由于城市化地区塑料材料中 PAEs 的排放量较高，城市地区的 PAEs 浓度高于农村地区。PAEs 浓度与沉积物有机质（fOM）呈正相关，与采样点年平均流量的逻辑值呈负相关。人为水坝改变的河流流量状况显著影响了 PAEs 的分布。PAEs 同系物组成分析表明，DEHP 是钱塘江的主要同系物。DEHP 的归一化浓度超过了推荐的环境风险限值（ERL）。
