Highly Organic Soils as “Witnesses” of Anthropogenic Pb, Cu, Zn, and 137Cs Inputs During Centuries
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Highly organic soils, and in particular ombrotrophic bogs, have been often used to reconstruct climate changes and heavy metal contaminations. Ombrotrophic peat bogs, in fact, are domed peatlands in which the surface layers are hydrologically isolated from the influence of local groundwaters and surface waters, and are supplied only by atmospheric depositions. In the present work, the attention of Authors has been focused on Pb, Cu, and Zn, coming mainly from anthropogenic activities, and 137Cs, released mostly during the Chernobyl disaster. Practically, an undisturbed peat profile was cored in 2005 from a Swiss ombrotrophic bog and analysed using energy-dispersive miniprobe multielement analyzer X-ray fluorescence and Low Background γ-ray spectrometry in order to investigate and quantify the impact of human activities (e.g., industry, traffic, combustion of fossil fuels, “environmental disasters”) in causing Pb, Cu, Zn, and 137Cs contaminations during the centuries. Obtained data show that highly organic soils in general, and ombrotrophic bogs in particular, reflect the anthropogenic inputs in heavy metal and radionuclide contaminations. In fact, these environments allowed to follow the depositional history of Pb, Cu, and Zn, both underlining a general increasing of their production since the Industrial Revolution, and remarking past single impacting events such as the introduction of leaded gasoline and of particular agricultural practices. Further, although 137Cs showed a main peak corresponding to the Chernobyl disaster, confirming the role of bogs as archive of human activity, data revealed a certain mobility of this radionuclide along the profile. Thus, highly organic soils can be considered as both “witness” of the impact of human activity during centuries and indicator of the health of our planet.
KeywordsPeat bogs Human activity Pb Cu Zn 137Cs
Special thanks goes to Dr. G. Le Roux for providing useful suggestions. Thanks also to anonymous reviewers for helpful comments on a previous version of the manuscript.
- Adriano, D. C. (1986). Trace elements in the terrestrial environment. New York: Springer.Google Scholar
- Barzi, F., Naidu, R., & McLaughlin, M. J. (1996). Contaminants and Australian soil environment. In R. Naidu, R. S. Kookuna, D. P. Oliver, S. Rogers, & M. J. McLaughlin (Eds.), Contaminants and the soil environment in the Australasia–Pacific region: Proceedings of the First Australasia Pacific Conference (pp. 451–484). Boston: Kluwer.Google Scholar
- Buffle, J. (1988). Complexation reactions in aquatic systems: An analytical approach. Chichester: Ellis Horwood.Google Scholar
- Cheburkin, A. K., & Shotyk, W. (1996). An energy-dispersive miniprobe multielement analyzer (EMMA) for direct analysis of Pb and other trace elements in peats. Fresenius’ Journal of Analytical Chemistry, 354, 688–691.Google Scholar
- Clymo, R. S. (1983). Peat. In A. J. P. Gore (Ed) Mires: Swamp, bog, fen and moor, ecosystems of the world, 4A (pp. 159–224). New York: Elsevier.Google Scholar
- Dau, J. H. C. (1823). Neues Handbuch uber den Torf. Leipzig: J.C. Hinrichsche Buchhandlung.Google Scholar
- Gallagher, D., McGee, E. J., & Mitchell, P. I. (2001). A recent history of 14C, 137Cs, 210Pb, and 241Am accumulation at two Irish peat bog sites: an east versus west coast comparison. Radiocarbon, 43, 517–525.Google Scholar
- Givelet, N., Roos-Barraclough, F., & Shotyk, W. (2003). Predominant anthropogenic sources and rates of atmospheric mercury accumulation in southern Ontario recorded by peat cores from three bogs: comparison with natural “background” values (past 8000 years). Journal of Environmental Monitoring, 5, 935–949.CrossRefGoogle Scholar
- Joray, M. (1942). L’Étange de la Gruyère, Jura bernois. Étude pollenanalytique et stratigraphique de la tourbière. In: Matériaux pour le Levé Géobotanique de la Suisse. 25. Berne: Hans Huber.Google Scholar
- Mitchell, P. I., Schell, W. R., McGarry, A., Ryan, T. P., Sanchez-Cabena, J. A., & Vidal-Quadras, A. (1992). Studies of the vertical distributions of 134Cs, 137Cs, 238Pu, 239,240Pu, 241Am and 210Pb in ombrogenous mires at mid-latitudes. Journal of Radioanalytical and Nuclear Chemistry, 156, 361–387.CrossRefGoogle Scholar
- Shotyk, W., & Le Roux, G. (2005). Biogeochemistry and cycling of lead. In A. Sigel, H. Sigel, & R. K. O. Sigel (Eds.), Biogeochemical cycles of the elements, vol. 43 of “metal ions in biological systems” (pp. 240–275). New York: Marcel Dekker.Google Scholar
- Smith, J. C., Ferguson, T. L., & Carson, B. L. (1975). Metals in new and used petroleum products and by-products. Quantities, and consequences. In T. F. Yen (Ed.), The role of trace metals in petroleum (pp. 123–138). Ann Arbor: Ann Arbor Science Publishers.Google Scholar
- Tiller, K. G., & Merry, R. H. (1981). Copper pollution of agricultural soils. In J. F. Loneragan, A. D. Robson, & R. D. Graham (Eds.), Proceedings of the Golden Jubilee International Symposium on Copper in Soils and Plants (pp. 119–137). Sydney: Academic.Google Scholar
- Weiss, D., Shotyk, W., Appleby, P. G., Cheburkin, A. K., & Kramers, J. D. (1999). Atmospheric Pb depositions since the Industrial Revolution recorded by five Swiss peat profile: enrichment factors, fluxes, isotopic composition, and sources. Environmental Science & Technology, 33, 1340–1352.CrossRefGoogle Scholar
- Zaccone, C., Cocozza, C., Cheburkin, A. K., Shotyk, W., & Miano, T. M. (2007c). Residual enrichment and depletion of major and trace elements, and radionuclides in ombrotrophic raw peat and related humic acids. Geoderma (in press) doi: 10.1016/j.geoderma.2007.06.007.
- Zaccone, C., Cocozza, C., D’Orazio, V., Plaza, C., Cheburkin, A. K., & Miano, T. M. (2007a). Influence of extractant on quality and trace elements content of peat humic acids. Talanta (in press) doi: 10.1016/j.talanta.2007.04.052.