Abstract
Purpose
Environmental contamination of lead (Pb) in soils and sediments poses serious threats to human and ecological health. The objective of this study is to investigate the effect of seasonal dove sports hunting activities on Pb contamination in acid forest soils.
Materials and methods
A grid sampling method was used to investigate the spatial distribution of Pb contamination in surface soils. Soils were analyzed for total metal(loid) concentration and characterized for physicochemical properties and mineralogy. Adsorption isotherm experiments were also conducted to understand the reactivity and retention capacity of Pb(II) in soils. Finally, synchrotron-based X-ray microprobe and X-ray absorption spectroscopy were used to understand the chemical speciation of Pb that controls the retention/release mechanisms of Pb in soils.
Results and discussion
There was no excessive accumulation of Pb at the site. However, the concentration of Pb in surface soils was greater than the background level (<16 mg kg−1). The contamination level of Pb was as high as 67 mg kg−1 near a patch of corn field where lime was frequently applied. A microfocused X-ray microprobe analysis showed the presence of Pb pellet fragments that predominantly contain oxidized Pb(II), suggesting that oxidative dissolution was occurring in soils. Dissolved Pb(II) can be readily retained in soils up to ~3,600 mg kg−1 via inner-sphere and outer-sphere surface complexation on carbon and aluminol functional groups of soil components, suggesting that partitioning reactions control the concentration of Pb in soil solution.
Conclusions
The fate of Pb is likely to be controlled by (1) oxidative dissolution process of Pb(0) pellets and (2) the release of outer-sphere and/or inner-sphere Pb surface complexes in humic substances and aluminosilicate/Al oxyhydroxides. Although no remedial actions are immediately required, the long-term accumulation of Pb in soils should be carefully monitored in protecting ecosystem and water quality at the dove hunting field.
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Acknowledgments
This research was supported in part by the Clemson University Undergraduate Creative Inquiry research funds. The authors thank the undergraduate students from the Department of Biosystems Engineering for assisting the sieving and drying processes of soils. Portions of this research were performed at BL X27A, NSLS, Brookhaven National Laboratory. The BL X27A is supported in part by the U.S. Department of Energy (DOE), geosciences (DE-FG02-92ER14244 to the University of Chicago—CARS) and Brookhaven National Laboratory, Department of Environmental Sciences. The use of the NSLS was supported by the U.S. DOE, Office of Science, Office of Basic Energy Sciences, under contract no. DE-AC02-98CH10886.
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Arai, Y., Rick, A.R., Saylor, T. et al. Macroscopic and molecular-scale assessment of soil lead contamination impacted by seasonal dove hunting activities. J Soils Sediments 11, 968–979 (2011). https://doi.org/10.1007/s11368-011-0374-z
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DOI: https://doi.org/10.1007/s11368-011-0374-z