Weathering fluxes of arsenic from a small catchment in Slovak Republic |
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| Authors: | Ahmed Melegy Igor Slaninka Tomas Pa?es and Stanislav Rapant |
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| Institution: | (1) Department of Geological Sciences, National Research Centre (NRC), Dokki, Cairo, Egypt;(2) Geological Survey of the Slovak Republic, Mlynsk? dolina 1, 817 04 Bratislava, Slovak Republic;(3) Czech Geological Survey, Kl?rov 3, 118 21 Prague 1, Czech Republic |
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| Abstract: | Inputs of As to a small catchment due to chemical weathering of bedrock, mechanical weathering of bedrock, and atmospheric
precipitation were 71.53, 23.98 and 0.02 g ha−1 year−1, respectively. The output fluxes of As due to mechanical erosion of soil, biological uptake, stream discharge, and groundwater
flow were 6.32, 4.77, 0.37 and 0.02 g ha−1 year−1, respectively. The results indicate that arsenic accumulates in soil and regolith with a very high rate. This is attributed
to the selective weathering and erosion with respect to arsenic and fixation of arsenic in the secondary solids produced by
weathering. The output fluxes of As in stream and groundwater in Vydrica catchment in Slovak Republic (0.39 g ha−1 year−1) based on muscovite–biotite granites and granodiorites were much lower compared to catchments in a gold district in the Czech
Republic. These results may be ascribed to the low levels of arsenic pollution measured in Vydrica catchment. The arsenic
fluxes were estimated by calculation of mechanical and chemical weathering rates of the bedrocks in Vydrica catchment from
mass balance data on sodium and silica. The justification of the steady state of Na and Si is that neither of the elements
is appreciably accumulated in plants and in exchangeable pool of ions in soil. |
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