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- Title
Historical atmospheric deposition in a Swedish mining area traced byS isotope ratios in soils
- Authors
Torssander, P.; Kusakabe, M.; Carlsson, E.; Morth, C.-M.
- Abstract
Mining activities for almost thousand years have caused large S emissions in the Falun area, central Sweden. Since the beginning of the 20th century, the S deposition has decreased considerably. The soil S concentrations and S isotope compositions were analyzed for SS and adsorbed SO42- for three soil profiles close to the mining area in order to identify the soil S sources. The d34S values were found to be different for SS and adsorbed SO42- and ranged from -3.7% to +2.6%. In the B-horizon, the observed SS d34S values (and hence calculated d34S values for organic S) were mostly lower than those of the adsorbed SO42-. In the O-horizon, SS showed similar d34S values as the adsorbed SO42- in the mineral soil. The adsorbed SO42- showed nearly constant d34S values with depth. Thed34S values in the soils are interpreted to reflect a mixture of historical and modern deposition due to soil S circulation with no or negligible fractionation. The lower d34S values of organic S in the B-horizon suggests preservation of acid deposition originating from mining activities back in time. The adsorbed SO42- in the mineral soil and the organic S in the O-horizon reflect a response to a new d34S composition in the atmosphere due to fossil fuel burning during the 20th century.
- Subjects
ATMOSPHERIC deposition; MINERAL industries; SOIL pollution
- Publication
Water, Air & Soil Pollution, 1999, Vol 110, Issue 1-2, p103
- ISSN
0049-6979
- Publication type
Article