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Pb and Cd binding to natural freshwater biofilms developed at different pH: the important role of culture pH

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Abstract

The effects of solution pH on adsorption of trace metals to different types of natural aquatic solid materials have been studied extensively, but few studies have been carried out to investigate the effect of pH at which the solid materials were formed on the adsorption. The purpose of present study is to examine this effect of culture pH on metal adsorption to natural freshwater biofilms. The adsorption of Pb and Cd to biofilms which were developed at different culture pH values (ranging from 6.5 to 9.0) was measured at the same adsorption pH value (6.5). The culture pH had considerable effects on both composition and metal adsorption ability of the biofilms. Higher culture pH usually promoted the accumulation of organic material and Fe oxides in the biofilms. The culture pH also affected the quantity and species of algae in the biofilms. The adsorption of Pb and Cd to the biofilms generally increased with the increase of culture pH. This increase was minor at lower pH range and significant at higher pH range and was more remarkable for Cd adsorption than for Pb adsorption. The notable contribution of organic material to the adsorption at higher culture pH values was also observed. The profound impacts of culture pH on adsorption behavior of biofilms mainly resulted from the variation of total contents of the biofilm components and were also affected by the alteration of composition and properties of the components.

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Acknowledgments

This work was supported by the National Natural Science Foundation of China (20607007 and 20877033), Jilin Environmental Protection Bureau (2009-19), and Major Science and Technology Program for Water Pollution Control and Treatment (no. 2009ZX07207-001-03).

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Correspondence to Xiuyi Hua.

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Responsible editor: Stuart Simpson

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Hua, X., Dong, D., Ding, X. et al. Pb and Cd binding to natural freshwater biofilms developed at different pH: the important role of culture pH. Environ Sci Pollut Res 20, 413–420 (2013). https://doi.org/10.1007/s11356-012-0927-8

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  • DOI: https://doi.org/10.1007/s11356-012-0927-8

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