Ivorra Lucia, Cardoso Patricia G, Chan Shek Kiu, Tagulao Karen, Cruzeiro Catarina
Institute of Science and Environment, ISE-University of Saint Joseph, Macao.
CIIMAR/CIMAR - Interdisciplinary Centre for Marine and Environmental Research, University of Porto, Matosinhos, Portugal.
Ecotoxicol Environ Saf. 2019 Apr 30;171:1-11. doi: 10.1016/j.ecoenv.2018.12.054. Epub 2018 Dec 21.
The Pearl River Delta (PRD) is one of the areas with higher environmental concentration of organochlorine pesticides (OCPs), being DDT one of the most abundant. In this work, 4,4'-dichlorobenzophenone (4,4'-DCBP), a common metabolite of dicofol (DDT related) and DDT, was quantified in surface waters of Hong Kong and Macao, together with the analysis of physicochemical and nutrients parameters. Hong Kong presented higher 4,4'-DCBP mean levels (12.50 ng/L) than Macao (4.05 ng/L), which may be due to the use of dicofol as a pesticide and DDT as antifouling-paint for ships. The region presented a possible eutrophication state due to the high nutrients' concentration. For the first time, toxicity evaluation of this metabolite in Artemia salina and Daphnia magna was done, in order to compute valid ECs and theoretically evaluate the risk in the PRD. The toxicity results (EC = 0.27 mg/L for A. salina; and EC = 0.17 mg/L and LC = 0.26 mg/L for D. magna), together with the 4,4'-DCBP levels quantified, indicated a low environmental risk.
珠江三角洲（PRD）是有机氯农药（OCPs）环境浓度较高的地区之一，滴滴涕（DDT）是其中含量最为丰富的一种。在这项研究中，对香港和澳门地表水的4,4'-二氯二苯甲酮（4,4'-DCBP，三氯杀螨醇（与DDT相关）和DDT的一种常见代谢产物）进行了定量分析，并对理化参数和营养参数进行了分析。香港的4,4'-DCBP平均水平（12.50纳克/升）高于澳门（4.05纳克/升），这可能是由于使用三氯杀螨醇作为农药以及使用DDT作为船舶防污漆所致。由于营养物质浓度较高，该地区呈现出可能的富营养化状态。首次对这种代谢产物在卤虫和大型溞中的毒性进行了评估，以便计算有效的半数效应浓度（ECs）并从理论上评估珠江三角洲地区的风险。毒性结果（卤虫的EC = 0.27毫克/升；大型溞的EC = 0.17毫克/升，LC = 0.26毫克/升）以及定量的4,4'-DCBP水平表明环境风险较低。
