Abstract
The bioavailability and toxicity of metals to aquatic organisms are highly dependent on water quality parameters in freshwaters. The biotic ligand model (BLM) for copper is an approach to generate the water quality criteria (WQC) with water chemistry in the ambient environment. However, few studies were carried out on the WQCs for copper based on the BLM approach in China. In the present study, the toxicity for copper to native Chinese aquatic organisms was conducted and the published toxicity data with water quality parameters to Chinese aquatic species were collected to derive the WQCs for copper by the BLM approach. The BLM-based WQCs (the criterion maximum criteria (CMC) and the criterion continuous concentration (CCC)) for copper in the freshwater for the nation and in the Taihu Lake were obtained. The CMC and CCC values for copper in China were derived to be 1.391 μg/L and 0.495 μg/L, respectively, and the CMC and CCC in the Taihu Lake were 32.194 μg/L and 9.697 μg/L. The high concentration of dissolved organic carbon might be a main reason which resulted in the higher WQC values in the Taihu Lake. The WQC of copper in the freshwater would provide a scientific foundation for water quality standards and the environment risk assessment in China.
Highlights
Metals have become widespread contaminants in surface water due to anthropogenic discharge
The bioavailability and toxicity of Cu to organisms is highly dependent on the chemical speciation [5,6,7] which is affected by water quality parameters.The increase of the concentrations of the cations (Ca2+, Mg2+, Na+ and H+) [8, 9] and dissolved organic matter (DOM)[10,11,12,13,14] would lead to decrease on the toxicity for Cu to aquatic
The acute and chronic toxicity data for seven native aquatic organisms were shown in Table 1, and the water quality parameters in the toxicity tests were shown as well
Summary
Metals have become widespread contaminants in surface water due to anthropogenic discharge. Increased environmental exposure of waterborne metals has resulted in potential risks to aquatic biota [1, 2]. Copper (Cu) is a ubiquitous pollutant in freshwaters [3] and listed as one of priority pollutants in China [4]. The bioavailability and toxicity of Cu to organisms is highly dependent on the chemical speciation [5,6,7] which is affected by water quality parameters.The increase of the concentrations of the cations (Ca2+, Mg2+, Na+ and H+) [8, 9] and dissolved organic matter (DOM)[10,11,12,13,14] would lead to decrease on the toxicity for Cu to aquatic.
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