Microelement content of the Novosibirsk reservoir bottom sediments as the reflection of its ecological state

The dark contents of bottom sediments samples (one of the Novosibirsk reser voir component) as a sample of its ecological state have been investigated. Microelement concentrations of these samples have been determined using X- ray fluorescence analysis with synchrotron radiation excitation (SRX-RFA). Insignificant differences between the microelement average concentrations o f the samples of bottom sediments in 1997 and the dark contents of these el ements has been established the (Vinogradov, Geochemistry of Rare and Dispe red Chemical Elements in Soils, Academy of Sciences of USSR Press, Moscow, 1957, p. 237 (in Russian)). On the whole the microelement contents in sampl es during the period 1991-1997 are close to their normal concentrations. (C ) 2000 Elsevier Science B.V. All rights reserved.