Wei Ya-Ning, Pan Jia-Chuan, Song Yu-Mei, Guo Peng-Ran, Wang Yi
College of Petrochemical Engineering, Lanzhou University of Technology, Lanzhou 730050, China.
Guangdonng Provincial Public Laboratory of Analysis and Testing Technology, China National Analytical Center (Guangzhou), Guangzhou 510070, China.
Huan Jing Ke Xue. 2016 Aug 8;37(8):3007-3016. doi: 10.13277/j.hjkx.2016.08.023.
The distribution characteristics and pollution degrees of 20 organochlorine pesticides (OCPs) were investigated in surface sediments from Zhelin Bay south of China and the ecological risk of OCPs and integrated ecological risk at the samples stations in sediments were evaluated by risk quotient (RQ) and sediment quality guideline of NOAA. The possible sources of HCHs and DDTs in sediments were preliminarily studied, and the correlation between OCPs and sediment characteristic parameters was discussed. The concentrations of DDTs in surface sediments were found to be higher than those of other OCPs, especially -DDD, and the concentrations of DDTs were higher than the limited values of Chinese Marine sediment quality criteria. The total concentration of 20 OCPs in surface sediments ranged from 14.14 to 306.88 ng·g, with a mean concentration of 78.37 ng·g, and the highest total concentration was at site 8(S8). There were inevitable adverse biological effects and high ecological risk of -DDD and -DDT, high integrated ecological risk at S8 and S10. The possible sources of HCHs in surface sediments of Zhelin Bay were mainly from the application of Lindane pesticides. At S1,S2,S10,S11 there was input of DDT into mariculture area of Zhelin Bay, and at the other sites the sources of DDT were from the early residue in sediments or the long-term weathering sediments of using pesticides. There was a very significant positive correlation between HCHs, endosulfan, chlordane and dieldrin in sediments, while there was a negative relation between the above OCPs and TOC, which indicated that the presence of TOC could promote their biodegradation. There was a significant positive correlation between -DDD and Ca, which revealed that DDT used in the early period was deposited with biological carbonate. Increasing size of sediment particles discouraged the accumulation and enrichment of OCPs in sediments.
对中国南方柘林湾表层沉积物中20种有机氯农药（OCPs）的分布特征和污染程度进行了调查，并采用风险商数（RQ）和美国国家海洋和大气管理局（NOAA）的沉积物质量指南对沉积物中OCPs的生态风险及各采样站位的综合生态风险进行了评估。初步研究了沉积物中六六六（HCHs）和滴滴涕（DDTs）的可能来源，并探讨了OCPs与沉积物特征参数之间的相关性。结果表明，表层沉积物中DDTs的浓度高于其他OCPs，尤其是p,p'-滴滴滴（p,p'-DDD），且DDTs的浓度高于中国海洋沉积物质量标准限值。表层沉积物中20种OCPs的总浓度范围为14.14~306.88 ng·g-1，平均浓度为78.37 ng·g-1，总浓度最高值出现在8号站位（S8）。p,p'-DDD和p,p'-滴滴涕（p,p'-DDT）存在不可避免的不良生物效应和高生态风险，S8和S10站位存在高综合生态风险。柘林湾表层沉积物中HCHs的可能来源主要是林丹农药的施用。在S1、S2、S10、S11站位有DDT输入柘林湾海水养殖区，其他站位DDT的来源为沉积物中的早期残留或农药长期风化的沉积物。沉积物中HCHs、硫丹、氯丹和狄氏剂之间存在极显著正相关，而上述OCPs与总有机碳（TOC）之间呈负相关，表明TOC的存在可促进其生物降解。p,p'-DDD与钙（Ca）之间存在显著正相关，表明早期使用的DDT与生物碳酸盐一起沉积。沉积物颗粒粒径增大不利于OCPs在沉积物中的积累和富集。
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