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Titolo:
Pb isotopes in sediments of Lake Constance, Central Europe constrain the heavy metal pathways and the pollution history of the catchment, the lake and the regional atmosphere
Autore:
Kober, B; Wessels, M; Bollhofer, A; Mangini, A;
Indirizzi:
Univ Heidelberg, Lab Geochronol, D-69120 Heidelberg, Germany Univ Heidelberg Heidelberg Germany D-69120 , D-69120 Heidelberg, Germany Univ Konstanz, Limnol Inst, D-7750 Constance, Germany Univ Konstanz Constance Germany D-7750 l Inst, D-7750 Constance, Germany Heidelberger Akad Wissensch, Heidelberg, Germany Heidelberger Akad Wissensch Heidelberg Germany sch, Heidelberg, Germany
Titolo Testata:
GEOCHIMICA ET COSMOCHIMICA ACTA
fascicolo: 9, volume: 63, anno: 1999,
pagine: 1293 - 1303
SICI:
0016-7037(199905)63:9<1293:PIISOL>2.0.ZU;2-W
Fonte:
ISI
Lingua:
ENG
Soggetto:
STABLE LEAD ISOTOPES; JURA MOUNTAINS; RATIOS; SWITZERLAND; TRACERS; POND; DEPOSITION; TRANSPORT; RIVERS; ZN;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
37
Recensione:
Indirizzi per estratti:
Indirizzo: Kober, B Univ Heidelberg, Lab Geochronol, Neuenheimer Feld 234, D-69120 Heidelberg,Germany Univ Heidelberg Neuenheimer Feld 234 Heidelberg Germany D-69120
Citazione:
B. Kober et al., "Pb isotopes in sediments of Lake Constance, Central Europe constrain the heavy metal pathways and the pollution history of the catchment, the lake and the regional atmosphere", GEOCH COS A, 63(9), 1999, pp. 1293-1303

Abstract

Pb isotope ratios and Pb concentrations of well-dated sediments of Lake Constance, Central Europe have been analyzed using thermal ion mass spectrometry. Sequential extraction studies indicated isotope homogeneity of the leachable Pb components within the investigated layers. Since the middle of the 19th century a significant anthropogenic Pb component appeared in the lake sediments, and rapidly approached concentration levels similar to that ofthe geogenic Pb background (20 ppm) at the beginning of the 20th century. Anthropogenic Pb was predominantly transferred to the lake sediments via the atmosphere. Pb sources were coal combustion, industrial ore processing and leaded gasoline. The flux of a fluvial Pb component to the lake sediments, additive to atmospheric Pb deposition, peaked in about 1960. This flux isattributed to (re)mobilization of Pb from polluted parts of the lake catchment, and indicates the change of catchment soils from a pollution sink to a heavy metal source. The strong reduction of anthropogenic Pb in the uppermost lake sediments since the 1960's has been caused by advances of environmental protection. The lake sediments record the changing fluxes and the isotope composition of the deposited aeolian Pb pollution. During the 20th century aeolian Pb fluxes to the lake sediments were in the range of 1-4 mu g/cm(2)/a. During peak emission periods of gasoline Pb to the atmosphere (1960-1990) the aerosol Pb isotope composition was rather constant (Pb-206/Pb-207: 1.12-1.13) and probably a mixture of Canadian and Australian with Russian and Central European Pb types. Aeolian Pb isotope and Pb flux trends in the lake sediments as a whole agree well with the trends found in Alpine glaciers (Doring etal., 1997a,b) and in ombrotrophic peat bogs of Switzerland (Shotyk et al.,1996). However, different industrial Pb components were deposited in the archives of aeolian pollution during the early 20th century. Copyright (C) 1999 Elsevier Science Ltd.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 14/07/20 alle ore 03:52:07