Distribution and sources of polycyclic aromatic hydrocarbons (PAHs) in surface sediment in Lake Chaohu

• DOI: 10.18307/2012.0612
• Publication Date: 2015-06-12T09:04:26Z
• Authors: NING Yi; ; KE Yongchun; DENG Jiancai; HU Weiping; GAO Junfeng; ZHAO Zhenhua
• Keywords: Chrysene; Dry weight

于2010年,采用野外采样调查、色谱分析与统计比较的方法,研究巢湖表层沉积物中27个采样点中多环芳烃(PAHs)分布特征及污染来源.结果表明:巢湖表层沉积物中检测出的14种优控PAHs总浓度为116.0~2832.2 ng/g(DW),平均值为898.9±791.0 ng/g(DW).多环芳烃组成主要以5~6环PAHs为主,占总量的32%~58%.沉积物中总有机碳含量与PAHs总量呈现良好相关性.利用蒽/(蒽+菲)与苯并[a]蒽/(苯并[a]蒽+屈)比值法对PAHs来源进行解析得出,巢湖表层沉积物中PAHs主要来源为燃烧源.与国内其它水体PAHs含量对比表明,巢湖沉积物中PAHs污染处于中等水平.生态风险评估得出南淝河表层沉积物中PAHs存在生态风险,其它采样点表层沉积物中PAHs生态风险均较低.;To clarify polycyclic aromatic hydrocarbons (PAHs) contamination characteristics in Lake Chaohu, 27 surface sediment samples from different locations the lake were collected 2010. Concentrations of 14 kinds PAHs measured by HPLC identified as priority pollutants US EPA. The total concentration ranged 116.0 to 2832.2 ng/g dry weight, with an average value 898.9 ± 791.0 weight. profiles showed that 5- and 6-ring predominant, which accounted for 32%-58% total, respectively. A good correlation between TOC content was observed. Based on Anthracene/(Anthracene + Phenanthrene) Benzo (a) anthracene/(Benzo anthracene Chrysene) ratios, originated largely high-temperature pyrolytic process. Risk assessment indicated Nanfei River most likely pose biological impairment, while low toxicological risk found other sampling sites.