Background concentrations of heavy metals in the surface soil horizon of oil and oil-gas condensate fields in Eastern Siberia
V.I. STURMAN, A.N. LOGINOVSKAYA
Bonch-Bruevich St. Petersburg State University of Telecommunications, St. Petersburg, Russia
Keywords: geochemistry, toxic elements, engineering and ecological surveys, Central Siberian Plateau, lithogenic basis of landscapes, analysis of variance
Abstract
Engineering and ecological survey data obtained on the oil and oil-gas condensate fields located in Eastern Siberia (Krasnoyarsk krai, Irkutsk oblast, and Republic of Sakha (Yakutia)) are processed and systematized. We determined average (background) concentrations of heavy metals and toxic elements which are subject to obligatory monitoring when carrying out engineering and ecological surveys (lead, cadmium, zinc, copper, nickel, arsenic, and mercury) for the main associations of soils, the prevalent kinds of soils, and also units of geochemical and metallogenic division into districts. It is established that the differences between soil phases for concentrations of the elements under study are, in general, rather small, which reflects commonalty of the source of elements: terrigenous deposits of the lower Paleozoic and poor development of processes of bio-accumulation in taiga conditions. The peat-podsolic alluvial-ferruginous soils are characterized by increased concentrations of copper and nickel. The influence of the litogenic basis on concentrations of heavy metals and toxic elements manifests itself more clearly than do the transformations of initial material in soil formation processes. Correlation coefficients are determined, dendrograms of interrelations of content of elements are constructed, and their associations are revealed: nickel and zinc; cadmium, mercury, arsenic; copper and lead. The resulting average concentrations of elements can be used as background concentrations in subsequent engineering and ecological surveys in the region.
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