Seasonal and spatial variation of chemical composition of the Upper Amur water

In the article the author considers seasonal and spatial dynamics of dissolved substances in the upper Amur River water, describing hydrochemical characteristics of its main tributaries - the Shilka and Argun rivers. It shows a considerable variation in the content of major ions in wintertime and of organic matter and total iron - during a flood period, and a small variability of chemical composition in the upper Amur River water, along its length, in the period of floods.