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Hydrobiological Journal
SJR: 0.227 SNIP: 0.901 CiteScore™: 0.5

ISSN Печать: 0018-8166
ISSN Онлайн: 1943-5991

Выпуски:
Том 56, 2020 Том 55, 2019 Том 54, 2018 Том 53, 2017 Том 52, 2016 Том 51, 2015 Том 50, 2014 Том 49, 2013 Том 48, 2012 Том 47, 2011 Том 46, 2010 Том 45, 2009 Том 44, 2008 Том 43, 2007 Том 42, 2006 Том 41, 2005 Том 40, 2004 Том 39, 2003 Том 38, 2002 Том 37, 2001 Том 36, 2000 Том 35, 1999 Том 34, 1998

Hydrobiological Journal

DOI: 10.1615/HydrobJ.v52.i6.90
pages 75-93

Co-existing Forms of Chromium in Natural Surface Waters and Their Significance for Aquatic Ecosystems

P. N. Linnik
Institute of Hydrobiology, National Academy of Sciences of Ukraine, Kiev

Краткое описание

Results of long-term investigations of the co-existing forms of chromium in water bodies of various types (rivers, reservoirs, lakes, and ponds) are given in the paper. In the studied water bodies, the total concentration of chromium varies over a wide range accounting for 1.7–71.4 μg/L. The lower reservoirs of the Dnieper cascade located in the industrial zone proved to be most contaminated by its compounds. However, as compared to the 1980–1990s their concentration essentially decreased, which was conditioned by a decrease in the intensity of industrial production. A rather high content of chromium is observed in some lake systems of Kiev, which is conditioned by a high intensity of anthropogenic load. In the studied water bodies, with the exception of the rivers of the Pripyat River basin and the Ukrainian section of the Danube River, chromium migrates mainly in the dissolved state, where it is represented mainly by the compounds of Cr(III).The concentration of Cr(VI) is almost always lower than the limit of its detection by the photometric method. The absence of Cr(VI) is determined by its reduction under conditions of natural surface waters to non-toxic Cr(III). The complex compounds of chromium with organic substances of various chemical natures prevail in the composition of the dissolved form of chromium. Humic substances and carbohydrates are of considerable importance in complexation. The major portion of Cr(III) was found in the composition of complex compounds with the molecular mass of not more than 5.0 kDa.


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