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引用本文:郦倩玉,赵中华,蒋豫,张路.鄱阳湖周溪湾沉积物中有机氯农药和多环芳烃的垂直分布特征.湖泊科学,2016,28(4):765-774. DOI:10.18307/2016.0409
LI Qianyu,ZHAO Zhonghua,JIANG Yu,ZHANG Lu.Vertical distribution characteristics of organochlorine pesticides and polycyclic aromatic hydrocarbons in a sedimentary core from Zhouxi Bay, Lake Poyang. J. Lake Sci.2016,28(4):765-774. DOI:10.18307/2016.0409
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鄱阳湖周溪湾沉积物中有机氯农药和多环芳烃的垂直分布特征
郦倩玉1, 赵中华1, 蒋豫1,2, 张路1
1.中国科学院南京地理与湖泊研究所湖泊与环境国家重点实验室, 南京 210008;2.南京林业大学, 南京 210037
摘要:
通过分析鄱阳湖周溪湾柱状沉积物中有机氯农药(OCPs)和多环芳烃(PAHs)的垂直分布特征,初步探讨该区OCPs和PAHs的污染历史. 结果表明,周溪湾柱状样中OCPs总含量范围在40.4~174.1 ng/g(dw)之间,六六六(HCHs)是其主要影响的化合物(16.5~153.6 ng/g(dw)),其次为氯丹类(Chlordanes)和滴滴涕类(DDTs),含量分别为3.4~44.0和1.0~33.4 ng/g(dw). 垂直分布特征显示:沉积相上OCPs的残留量比实际使用情况向后推迟10~20年,1950s1990s OCPs曾被大量使用,到2000年左右在沉积物残留上达到顶峰,随后残留量逐渐降低;而近20年来,该区已经鲜有新的HCHs、Chlordanes以及DDTs输入. PAHs总含量范围为41.3~384 ng/g(dw),芘和菲的含量最高,分别为17.1~67.1和2.68~139 ng/g(dw). 垂直分布特征显示,1972年以前,PAHs总含量变幅不大,然而近10年来PAHs的排放量急剧上升. 此外,自20世纪末开始,周溪湾区域PAHs的主要来源由以前的煤燃烧释放转化为交通污染排放,并伴随有石油泄漏情况.
关键词:  有机氯农药  多环芳烃  沉积物  垂直分布  周溪湾  鄱阳湖
DOI:10.18307/2016.0409
分类号:
基金项目:国家重点基础研究发展计划“973”项目(2012CB417005)、科技部基础性工作专项(2012FY111800-03)、国家自然科学基金青年基金项目(41201535, 41373017)和江苏省自然科学基金项目(BK2102503)联合资助.
Vertical distribution characteristics of organochlorine pesticides and polycyclic aromatic hydrocarbons in a sedimentary core from Zhouxi Bay, Lake Poyang
LI Qianyu1, ZHAO Zhonghua1, JIANG Yu1,2, ZHANG Lu1
1.State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, P.R.China;2.Nanjing Forestry University, Nanjing 210037, P.R.China
Abstract:
Zhouxi Bay from Lake Poyang is an important freshwater peals culture zone. A 72 cm-deep sediment core was collected from the bay to examine the vertical distribution characteristics of organochlorine pesticides and polycyclic aromatic hydrocarbons. By measuring GC-μECD and HPLC-DAD/FLD, the pollution history of organochlorine pesticides and polycyclic aromatic hydrocarbons in this region was revealed. The total OCPs content ranged from 40.4 to 174.1 ng/g(dw). HCHs was the most abundant compound (16.5-153.6 ng/g(dw)), followed by Chlordanes and DDTs, which were in the range of 3.4-44.0 ng/g(dw) and 1.0-33.4 ng/g(dw), respectively. The vertical distribution characteristics show that the residues of OCPs in sedimentary core were put off 10-20 years later than the usage of OCPs in environment. OCPs have been widely used since the mid-20th century, peaked in 2000, and then the residues of OCPs were gradually decreased. In the past 20 years, Limited amount of HCHs, Chlordanes and DDTs have entered in this area. The total PAHs content ranged from 41.3-384 ng/g(dw). Among PAHs, the concentration of Pyr and Phe were 7.1-67.1 ng/g(dw) and 2.68-139 ng/g(dw), respectively, much higher than other compounds. The vertical distribution characteristics show that the total PAHs content had a little variation before 1972, however, it has been sharply increased in last decades. Moreover, the sources of PAHs have changed from coal combustion to vehicle emission since the end of the 20th century, as well as oil spill.
Key words:  OCPs  PAHs  sediments  vertical distribution  Zhouxi Bay  Lake Poyang
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