Effects of waterlogging on the solubility and redox state of Sb in a shooting range soil and its uptake by grasses: a tank experiment |
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Authors: | Xiao-ming Wan Susan Tandy Kerstin Hockmann Rainer Schulin |
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Affiliation: | 1. Chinese Academy of Sciences, Institute of Geographic Sciences and Natural Resources Research, Beijing, 100101, China 2. ETH Zürich, Institute of Terrestrial Ecosystems, Universit?tstrasse 16, CH-8092, Zürich, Switzerland 3. University of Chinese Academy of Sciences, Beijing, 100049, China
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Abstract: | Aims The effects of waterlogging on redox state and solubility of antimony (Sb) in a calcareous shooting range soil and its uptake by forage grass Lolium perenne L. and pasture weed Holcus lanatus L. were investigated. Methods Grasses were grown on semi-waterlogged or waterlogged shooting range soil in a laboratory tank. The soil solution was sampled at various depths over time and analyzed for the concentrations of Sb(III), Sb(V) and total Sb, as well as other trace elements. Results Although the reduction of Sb(V) to Sb(III) under increased waterlogging time decreased Sb solubility, it increased Sb uptake by L. perenne from 1.1 to 1.7 mg?kg?1 (and to a lesser extent H. lanatus), implying preferential uptake of Sb(III) by this grass. The tank showed considerable variation in redox conditions with depth and plant treatment. The soil root zone (30 cm for L. perenne and 15 cm for H. lanatus) instead of the water saturated bottom, showed the highest manganese (Mn) and iron (Fe) concentrations in solution, accompanied by a higher proportion of Sb(III) in solution than the bottom zone of the tank. Conclusions Waterlogging can increase the risk of Sb entering the food chain from shooting range soil. |
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