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• W2057831645 abstract "Organic C and total N concentrations, C/N ratios, δ(15)N and δ(13)C values in (210)Pb-dated sediment cores were used to reconstruct historical changes in organic matter (OM) accumulation in three Swedish lakes receiving nutrient-rich mine waters. Ammonium-nitrate-based explosives and sodium cyanide (NaCN) used in gold extraction were the major N sources, while lesser amounts of P originated from apatite and flotation chemicals. The software IsoSource was used to model the relative contribution of soil, terrestrial and littoral vegetation, and phytoplankton detritus in the lake sediments. In one lake the IsoSource modelling failed, suggesting the presence of additional, unknown OM sources. In two of the lakes sedimentary detritus of littoral vegetation and phytoplankton had increased by 15-20% and 20-35%, respectively, since ~1950, when N- and P-rich mine waters began to reach the lakes. Today, phytoplankton is the dominating OM component in these lake sediments, which appears to be a eutrophication effect related to mining operations. Changes in the N isotopic composition of biota, lake water, and sediments related to the use of ammonium-nitrate-based explosives and NaCN were evident in the two studied systems. However, N isotope signals in the receiving waters (δ(15)N~+9‰ to +19‰) were clearly shifted from the primary signal in explosives (δ(15)N-NO3=+3.4±0.3‰; δ(15)N-NH4=-8.0±0.3‰) and NaCN (δ(15)N=+1.1±0.5‰), and direct tracing of the primary N isotope signals in mining chemicals was not possible in the receiving waters. Systems where mine waters with a well known discharge history are a major point source of N with well-defined isotopic composition should, however, be suitable for further studies of processes controlling N isotope signatures and their transformation in aquatic systems receiving mine waters." @default.
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• W2057831645 date "2014-07-01" @default.
• W2057831645 modified "2023-09-23" @default.
• W2057831645 title "Sedimentary records of δ 13 C, δ 15 N and organic matter accumulation in lakes receiving nutrient-rich mine waters" @default.
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• W2057831645 doi "https://doi.org/10.1016/j.scitotenv.2014.03.068" @default.
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