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Decrease of Pb bioavailability in solis by addition of phosphate ions

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Abstract

Bioavailability of Pb in contaminated soils can be highly decreased by conversion of labile Pb species into pyromorphite Pb5(PO4)3Cl, induced by amendment with a phosphate source. However, PO4 3− can be specifically adsorbed on goethite α-Fe(OH)3 present in soils. We demonstrate that despite the stability of phosphate ions adsorbed on goethite surface, the reaction between goethite-adsorbed phosphates and aqueous lead in the presence of Cl− results in crystallization of pyromorphite. Two morphological forms of pyromorphite formed on goethite were observed: 1) incrustations, indicating direct reaction of Pb and Cl ions with PO4 3− adsorbed on goethite surface, and 2) aggregates of pyromorphite crystals indicating that the reaction with PO4 3− ions took place in the volume of the solution. This suggests that precipitation of pyromorphite is faster than desorption of phosphates and that aqueous Pb may serve as a sink for phosphate ions by shifting the equilibrium and inducing PO4 3− desorption.

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Acknowledgements

This paper greatly benefits from analytical help and discussions with W. Mozgawa and A. Gaweł. This work was supported by the KBN as the AGH-University of Science and Technology grant No. 11.11.140.158

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Authors and Affiliations

  1. Faculty of Geology, Geophysics and Environment Protection, AGH-University of Science and Technology, al.Mickiewicza 30, 30-059, Krakow, Poland

    Maciej Manecki, Anna Bogucka & Tomasz Bajda

  2. Department of Geological Sciences, Miami University, Oxford, Ohio, USA

    Olaf Borkiewicz

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  1. Maciej Manecki
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  2. Anna Bogucka
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  3. Tomasz Bajda
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  4. Olaf Borkiewicz
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Correspondence to Maciej Manecki.

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Manecki, M., Bogucka, A., Bajda, T. et al. Decrease of Pb bioavailability in solis by addition of phosphate ions. Environ Chem Lett 3, 178–181 (2006). https://doi.org/10.1007/s10311-005-0030-1

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  • DOI: https://doi.org/10.1007/s10311-005-0030-1

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