Honghu Lake in Jianghan Plain, central China is an important habitat for many migratory birds and an important site for freshwater fishery, and Honghu Lake region is also a main area for rice and cotton production in China. To understand the status and changes of organochlorine pesticide (OCP) contamination, and to assess the OCPs' risks for the ecosystem in Honghu Lake, thirty surface water samples, fifteen surface sediments, and a sediment core were collected in January and July, 2005. OCPs, such as DDTs, HCHs and chlordanes, were determined by GC-ECD in all samples. Concentrations of OCPs in surface water collected during the wet season (July 2005) were relatively higher than those collected during the dry season (January 2005), indicating that the increasing land runoff during the summer might bring the chemical residues from soils to Honghu Lake. The relatively low alpha-HCH/gamma-HCH ratio and the relatively high o,p'-DDT/p,p'-DDT ratio indicated the application of lindane on regional agricultural lands in late spring and summer (April-August), which increased the increasing contribution of dicofol to DDT in Honghu Lake, respectively. The levels of Sigma HCHs and Sigma DDTs in the surface sediments were relatively lower than those from the Yangtze River Delta, but comparable to those from other lakes and rivers in China. The composition of HCHs and DDTs in the surface sediments showed that there was fresh input of lindane (gamma-HCH), and DDT residues in Honghu Lake were aged and probably mainly originated from weathered agricultural soils of surrounding Jianghan Plain. Wash out of HCHs and DDTs from soil was the possible process which caused the increasing concentrations of these chemicals in recent years. (C) 2013 Elsevier B.V. All rights reserved.
英文摘要:
Honghu Lake in Jianghan Plain, central China is an important habitat for many migratory birds and an important site for freshwater fishery, and Honghu Lake region is also a main area for rice and cotton production in China. To understand the status and changes of organochlorine pesticide (OCP) contamination, and to assess the OCPs' risks for the ecosystem in Honghu Lake, thirty surface water samples, fifteen surface sediments, and a sediment core were collected in January and July, 2005. OCPs, such as DDTs, HCHs and chlordanes, were determined by GC-ECD in all samples. Concentrations of OCPs in surface water collected during the wet season (July 2005) were relatively higher than those collected during the dry season (January 2005), indicating that the increasing land runoff during the summer might bring the chemical residues from soils to Honghu Lake. The relatively low alpha-HCH/gamma-HCH ratio and the relatively high o,p'-DDT/p,p'-DDT ratio indicated the application of lindane on regional agricultural lands in late spring and summer (April-August), which increased the increasing contribution of dicofol to DDT in Honghu Lake, respectively. The levels of Sigma HCHs and Sigma DDTs in the surface sediments were relatively lower than those from the Yangtze River Delta, but comparable to those from other lakes and rivers in China. The composition of HCHs and DDTs in the surface sediments showed that there was fresh input of lindane (gamma-HCH), and DDT residues in Honghu Lake were aged and probably mainly originated from weathered agricultural soils of surrounding Jianghan Plain. Wash out of HCHs and DDTs from soil was the possible process which caused the increasing concentrations of these chemicals in recent years. (C) 2013 Elsevier B.V. All rights reserved.
关键词[WOS]:
PERSISTENT ORGANIC POLLUTANTS
; PEARL RIVER DELTA
; SOUTH CHINA
; EAST CHINA
; TAIHU LAKE
; CLIMATE-CHANGE
; SURFACE-WATER
; ARCTIC-OCEAN
; AIR
; RESIDUES
1.State Key Lab Biogeol & Environm Geol, Wuhan 430074, Hubei, Peoples R China 2.Jiangsu Bioengn Res Ctr Selenium, Suzhou 215123, Jiangsu, Peoples R China 3.Univ Sci & Technol China, Suzhou Inst Adv Study, Adv Lab Selenium & Human Hlth, Suzhou 215123, Jiangsu, Peoples R China 4.Anhui Normal Univ, Coll Environm Sci & Engn, Wuhu 241003, Anhui, Peoples R China 5.Chinese Acad Sci, Inst Hydrobiol, Wuhan 430072, Hubei, Peoples R China 6.Wuhan Univ Sci & Technol, Inst Environm Sci & Engn, Wuhan 430070, Hubei, Peoples R China
Recommended Citation:
Yuan, Linxi; Qi, Shihua; Wu, Xiaoguo; Wu, Chenxi; Xing, Xinli; Gong, Xiangyi.Spatial and temporal variations of organochlorine pesticides (OCPs) in water and sediments from Honghu Lake, China,JOURNAL OF GEOCHEMICAL EXPLORATION,2013,132():181-187
