Abstract
‘Acid-flush’ events, monitored in an upland catchment in the Cairngorm Mountains (Scotland) at the time of the spring-thaw, are associated with an increase in stream discharge and raised concentrations of both major ions (Ca, Mg, Na, Cl, N03, and SO,) and trace-elements (Al, Cd, Cu, Fe, Mn, and Pb), in addition to H+. The streamwater chemistry is determined by the hydrological pathways which are operative in the catchment during these periods of snowmelt, and reflects both the meltwater composition and the influence of the soils within the catchment. Aluminium, in particular, is leached from the soils and high concentrations (up to 330 μg L−1) occur in the streamwaters. The presence of frozen soils, which result largely due to the influence of meteorological conditions prior to the accumulation of the snowpack, is likely to have a large impact on the Al concentrations in the streamwaters. The low concentrations of Ca monitored in the stream during the periods of snow-melt (<0.2 mg L−1) may promote subsequent toxic effects of the Al to aquatic life forms.[/p]
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Abrahams, P.W., Tranter, M., Davies, T.D. et al. Geochemical studies in a remote scottish upland catchment II. Streamwater chemistry during snow-melt. Water Air Soil Pollut 43, 231–248 (1989). https://doi.org/10.1007/BF00279194
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DOI: https://doi.org/10.1007/BF00279194