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1977 (1)
1Author    German MüllerRequires cookie*
 Title    Schadstoff-Untersuchungen an datierten Sedimentkernen aus dem Bodensee II. Historische Entwicklung von Schwermetallen — Beziehung zur Entwicklung polycyclischer aromatischer Kohlenwasserstoffe * Pollution Research on Dated Sediment Cores from Lake Constance II. Historical Evolution of Heavy Metals — Relationship to the Evolution of Polycyclic Aromatic H ydrocarbons  
 Abstract    The vertical distribution of eight heavy metals (Hg, Cu, Zn, Cr, Co, Ni, Pb, Cd) in dated sediments of four sedimentary profiles from the central part of Lake Constance was examined. From 1900 to about 1960 — 1970, a general increase of all heavy metals was observed. After this time, the concentrations of most of the metals decreased. As compared with pre-1900 "natural" metal concentrations, Cd and Pb have been enriched the strongest (enrichment factors 4.0 and 3.8 resp.), whereas Ni and Co exhibit least civilizational influences (enrichment factors 1.5 and 1.9 resp.). Cu, Cr, Zn and Hg were enriched by a factor between 2 — 3. Elements which were not influenced by anthropogenic processes — such as K and Li — remained unaffected over the whole vertical sequence. Polycyclic aromatic hydrocarbons (PAH) which were also studied in the same sediment material by Grimmer and Böhnke show a similar pattern. Within a sedimentary profile the concentration ratio benzo (a) pyrene: cadmium remained about constant. Combustion of coal is believed to be the common source of both heavy metals and PAH and seems to be responsible for the general distribution pattern of both groups of pollutants. In ad­ dition, local sources — both domestic and industrial — are assumed to have delivered additional heavy metal pollution. 
  Reference    (Z. Naturforsch. 32c, 913 [1977]; eingegangen am 12. Juli 1977) 
  Published    1977 
  Keywords    Sediments, Heavy Metals, Polycyclic Aromatic Hydrocarbons, Lake Constance 
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 TEI-XML for    default:Reihe_C/32/ZNC-1977-32c-0913.pdf 
 Identifier    ZNC-1977-32c-0913 
 Volume    32