Abstract
Variations in the chemical composition of the surface waters near Khabarovsk are described for the period of 1896–2008. Seasonal variations in the chemical composition of the Amur and Ussuri waters are shown. The hydrochemical characteristics of the Kazakevicheva, Pryamaya, and Amurskaya passages are presented. The results obtained show that the concentrations of the main ions, as well as biogenic and organic substances, depend on the location of the maximal river runoff in the Amur basin. The impact of economic activities in the Middle Amur area on the dissolved matter content in the Amur and Ussuri rivers near Khabarovsk, as well as the distribution of these substance concentrations across the Amur River and the Amurskaya passage, is described. During the 50 years of regular observations, the mineralization of the Amur water in the winter low-water period has decreased by 1.5 times and the organic matter content has increased by 2 times.
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