Institute of Oceanography , Minjiang University , Fuzhou 350108 , China.
Laboratory of Marine Biology and Ecology , Third Institute of Oceanography, Ministry of Natural Resources , Xiamen 361005 , China.
Environ Sci Technol. 2019 Nov 19;53(22):13088-13097. doi: 10.1021/acs.est.8b00105. Epub 2019 Nov 7.
To investigate the characteristics of historic-use organochlorine pesticides (OCPs) in the marginal seawater of China, we examined the seasonal and spatial distributions of hexachlorobenzene (HCB), hexachlorocyclohexanes (HCHs), and dichlorodiphenyltrichloroethane (DDTs) in the northern South China Sea (NSCS, 18-23° N) and East China Sea (ECS, 26-32° N). Seasonally, in the NSCS, the significantly higher concentrations ( < 0.05) of HCB, HCHs, and DDTs were found in summer, autumn, and summer through autumn, respectively. In the ECS, the higher concentrations were found in summer through winter, autumn, and summer. Spatially, HCB concentrations were significantly higher in the NSCS than in the ECS during all seasons except winter. During all four seasons, concentrations of HCHs were significantly higher in the NSCS than in the ECS. In summer and autumn, concentrations of DDTs were significantly higher in the NSCS than in the ECS, while no significant differences were found in spring and winter. Generally, regional usage, river-influenced coastal plumes, phytoplankton abundances, and ocean currents played crucial roles in the input, transport, degradation, and dilution of OCPs. These dynamic factors along with the seasonally alternating monsoon directly influenced the seasonal and spatial characteristics of OCPs. Furthermore, the profiles and diagnostic ratios of HCHs and DDTs revealed highly weathered OCP residues, attributed to eroded soils carried by surface runoff and long-range oceanic and atmospheric transport.
为了研究中国边缘海历史上使用的有机氯农药（OCPs）的特征，我们检测了南海北部（18-23°N）和东海（26-32°N）边缘海季节性和空间分布的六氯苯（HCB）、六氯环己烷（HCHs）和滴滴涕（DDTs）。季节上，在南海北部，HCB、HCHs 和 DDT 的浓度夏季、秋季和夏季秋季分别显著较高（<0.05）。在东海，夏季冬季、秋季和夏季的浓度较高。空间上，除冬季外，南海北部 HCB 浓度在各季节均显著高于东海。各季节南海北部 HCHs 浓度均显著高于东海。在夏季和秋季，南海北部 DDTs 浓度显著高于东海，而在春季和冬季则没有显著差异。一般来说，区域使用、河流影响的沿海羽流、浮游植物丰度和海流在 OCPs 的输入、传输、降解和稀释中起着至关重要的作用。这些动态因素以及季节性交替的季风直接影响 OCPs 的季节性和空间特征。此外，HCHs 和 DDTs 的分布特征和诊断比揭示了高度风化的 OCP 残留，这归因于地表径流携带的侵蚀土壤以及长距离海洋和大气输送。
