Ecotoxicity series of heavy metals in some lakes of Akmola region

Abstract

The article represents the results of the research of heavy metals (Cd, Pb, Cu, Zn) contents in the tissues and
living organs of Perca fluvitatilis linnaeus from the one of the biggest lakes in Kazakhstan (Kopa,Zerenda, Kokai, Sultankeldy)
and carassius gibelio from Yesay lake. The research was conducted by the flame atomic absorption method with electrothermal
automatization.The results of the study showed that the concentration of metals in fish increases from lakes far from populated
areas to lakes located in the residential area. The results of the study showed that the concentration of the metals studied in the
samples increases from lakes more distant from populated areas to lakes located in the residential area. It was found that the
series of descending heavy metals in the samples for each lake has the following general form Zn > Cu > Pb > Cd. The level
of heavy metals in tissues about the organs of ichthyological samples in most of the lakes studied exceeds the norms adopted in
Kazakhstan for fresh fish products.