| Summary: | Estimation of microelements condition in the environment is based on chemicalthermodynamic modeling CTM founded on natural-analytical and reference data. Our approach to CTM of heavy metals HM ions condition in a fresh superficial waters is comprised the experimental estimation of metal binding with dissolved organic matter DOM. We investigated three types of natural superficial fresh waters of Siberia Novosibirsk Reservoir, small lakes on the West Siberia north and the lake Muru in Sakha-Yakutia and made a number of conclusions about the HM Cu2+, Pb2+, Cd2+ condition in the laquo;solutionraquo; part of these waters: minus; the basic HM forms are hydroxo-, carbonate complexes, the binded with DOM forms ML* and aqua-ions of metals M2+ aq; minus; major factors influencing HM distribution are the pH, concentration and nature of DOM, concentration of HCO3 - mineralization; minus; in a season of active photosynthesis the HM distribution under the chemical forms speciation considerably varies with depth and time of day in one reservoir; minus; the HM binding on DOM frequently happens dominant; minus; the quota of ML* widely varies from a law level up to complete prevalence, therefore at modeling of a HM condition in natural waters such binding is necessary to take into account. The results of CTM i.e. estimations of HM speciation can be used in various aspects of ecological monitoring. For example, they are useful to an estimation of potential damage from pollution of natural waters by HM. So, for small northern lakes the negative factor of influence on biota is the increased quota of M2+ aq in them.
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