In the natural surroundings tectonical, climatological, dynamic and physico-chemical
conditions of sedimentation are the crucial factors in the process of sediment composition
formation. Grain size is one of the most investigated reasons of space and temporary
variability in heavy metal concentration. In general, the data on grain size measurement
afford to appreciate sorption capacity of sediments and arrange them. The dependence
heavy metal content on grain size of sediments has been examined in the enormous
amount of research works. The main conclusion is that if grain size decreases, metal
content increases.We have carried out sediment grain size measurement of two lakes
(Chebachje Lake, Piketnoye Lake) located in the South of Western Siberia, Russia. To
define grain size of these sediments the sorting of samples collected layer-by-layer has
been conducted by nest of sieves (from 43 to 1000 μm). Accomplished examinations allow
to state that layer-by-layer grain size measurement of sediments has significant importance
in reconstruction of paleoecologic peculiarities and also influences organic and inorganic
matter concentrating in the sediments in dynamics