Residues and sources of HCHs and DDTs in the sediments of land-based sewage outlet to the Zhanjiang Bay, China
- PDF / 281,439 Bytes
- 6 Pages / 595 x 842 pts (A4) Page_size
- 39 Downloads / 175 Views
Residues and sources of HCHs and DDTs in the sediments of land-based sewage outlet to the Zhanjiang Bay, China Lirong Zhao1†, Yuzhen Shi1†, Hui Zhao1, Jibiao Zhang1*, Xingli Sun1 1 College of Chemistry and Environmental Science, Guangdong Ocean University, Zhanjiang 524088, China
Received 27 February 2018; accepted 29 January 2019 © Chinese Society for Oceanography and Springer-Verlag GmbH Germany, part of Springer Nature 2019
Abstract
Due to the large usage of DDT-containing antifouling paints and lindane in China, heavy residuals of DDTs and HCHs have been found in many fishing harbors, but there is lack of studies on this issue for the Zhanjiang Bay which is an important fishing harbor and mariculture zone in South China. To evaluate the pollution status and sources of HCHs and DDTs in the Zhanjiang Bay, the concentrations, spatial distributions and sources in the sediments of 11 land-based sewage outlets to the Zhanjiang Bay were investigated. Since the 1980s, HCHs residuals had obviously decreased in studied areas, but DDTs had little change, even abnormally high levels were found in some sites. The content percentages and diagnostic ratios of HCHs isomers and DDTs showed that the source of HCHs was derived from soils around the bay and recent input of lindane, and DDTs were from historical residues of technical DDTs and fresh input of DDT-containing antifouling paints on fishing ships. Based on sediment quality guidelines, DDTs would be of more concern for the ecotoxicological risk on marine environment and adverse effects on benthonic organisms. This study indicated that lindane and DDT-containing products may be still used in some places of Zhanjiang City. It should be urgent to control their usage and clean the DDTscontaminated sites by the local government. Key words: Zhanjiang Bay, sediment, DDTs, HCHs Citation: Zhao Lirong, Shi Yuzhen, Zhao Hui, Zhang Jibiao, Sun Xingli. 2019. Residues and sources of HCHs and DDTs in the sediments of land-based sewage outlet to the Zhanjiang Bay, China. Acta Oceanologica Sinica, 38(12): 8–13, doi: 10.1007/s13131-019-1432-4
1 Introduction Dichlorodiphenyltrichloroethane (DDTs, including o, p′DDT, p, p′-DDT, p, p′-DDE and p, p′-DDD) and hexachlorocyclohexane (HCHs, including α-HCH, β-HCH, γ-HCH and δ-HCH), were widely used in China as pesticides for agriculture, pest control and mosquito abatement between the 1950s and the 1980s. Although China officially prohibited HCHs and DDTs to use for agriculture in 1983 and fully banned in 2002 (except for special uses for hygiene purposes), DDTs were still allowed to use as biocide in antifouling paints and intermediate materials in dicofol production, and lindane as a substitute pesticide for technical HCHs for a long time, which possibly resulted in high residual levels of HCHs and DDTs in regional soil and sediment in China. Some reports have confirmed that the pollution of HCHs and DDTs is still serious in sediments of estuary, fishing port, marine aquaculture area, and shipyard, where DDTs′ concentrations may be 1–2 orders
Data Loading...
