PuSH - Publikationsserver des Helmholtz Zentrums München: Environmental characterization of 4,4 '-dichlorobenzophenone in surface waters from Macao and Hong Kong coastal areas (Pearl River Delta) and its toxicity on two biological models: Artemia salina and Daphnia magna.

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Ivorra, L.* ; Cardoso, P.G.* ; Chan, S.K.* ; Tagulao, K.* ; Cruzeiro, C.

Environmental characterization of 4,4 '-dichlorobenzophenone in surface waters from Macao and Hong Kong coastal areas (Pearl River Delta) and its toxicity on two biological models: Artemia salina and Daphnia magna.

Ecotoxicol. Environ. Saf. 171, 1-11 (2019)

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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 sauna and Daphnia magna was done, in order to compute valid EC(50)s and theoretically evaluate the risk in the PRO. The toxicity results (EC50 = 0.27 mg/L for A. salina; and EC50 = 0.17 mg/L and LC50 = 0.26 mg/L for D. magna), together with the 4,4'-DCBP levels quantified, indicated a low environmental risk.

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