Sediment content of metals before and after lake water liming

Abstract

Long-term liming (1980-1991) of an acidified lake (Lake Terjevann) in the southernmost part of Norway, show an increased accumulation of Al, Fe, Mn, Cd, Cu, Ni, Zn in the sediments which clearly corresponds with the liming history. The increased precipitation of Al, Fe and Mn are ascribed to extended formation of oxyhydroxides due to increased pH after introduction of the lime. Statistically significant correlations indicate that Cu, Ni and Zn are coprecipitated with both Al and Fe oxyhydroxides while Cd is coprecipitated primarily with Fe oxyhydroxides both previous to and after lake water liming.