Effect of EDTA on toxicity and distribution of Cu in aquatic microcosm

Abstract

Abstract: The effect of EDTA at different concentrations (0.0,1.0,8.0mg·L^-1) on toxicity and distribution of Cu(2.0mg·L^-1) in simulated aquatic microcosm was conducted. The results show that after adding Cu at concentration of 2.0mg·L^-1, the time curves of population size, chlorophyll a concentration, and ratio of total primary production to total respiration of Daphnia magna were lower in treatment without EDTAthan in other treatments. The presence of EDTA decreased the toxicity of Cu to Daphnia magna and algae, and alleviated the influence of Cu on metabolic function of ecosystem, but changed the distribution of Cu in different apartments of the microcosm. The amount of Cu increased by 0.1～6.7% in water body, while decreased by 0.8～6.5% in sediment. In addition, the presence of EDTAaffected the Cu bioaccumulation by Daphnia magna and algae.

Key words: EDTA, Microcosm, Copper, Distribution, Toxicity, Daphnia magna, spatial heterogeneity, coastal saline area, salt-tolerant plant, soil chemical factor

Zhang Yimin, Jin Hongjun. Effect of EDTA on toxicity and distribution of Cu in aquatic microcosm[J]. Chinese Journal of Applied Ecology, 1999, 10(4): 485-488.

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