Title of article :
Seasonal transport pattern of chromium(III and VI) in a stream receiving wastewater from tanneries
Author/Authors :
Ewa Szalinska، نويسنده , , Ewa and Dominik، نويسنده , , Janusz and Vignati، نويسنده , , Davide A.L. and Bobrowski، نويسنده , , Andrzej and Bas، نويسنده , , Boguslaw، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2010
Pages :
7
From page :
116
To page :
122
Abstract :
Water, suspended matter and sediment samples from a system heavily impacted by wastewater from numerous small tanneries (the upper Dunajec River, southern Poland) were collected to establish the annual cycle of Cr. To study possible oxidation processes the speciation of Cr and Mn concentrations were also investigated. This study showed that Cr(III and VI) temporal and spatial distributions are regulated by coupled anthropogenic (source location and emissions) and hydrologic factors (water flow and particle transport). Chromium(III) concentrations in all compartments varied seasonally as a function of the hydrological regime, production cycle in tanneries and distance from the discharge location. Cr(III) was largely associated with the particulate phase and rapidly deposited in river bed sediments. Contaminated river sediments were however flushed during flood periods to the reservoir located downstream from tanneries. During the tanning season (November to March), Chromium(III) concentrations in the water column and total Cr concentration in sediments exceeded relevant ecotoxicological guidelines only upstream from the reservoir, which trapped about 70% of the annual Cr(III) load transported by the Dunajec river. A correlation between Cr(VI)/Cr(III) ratios and Mn concentration in sediments downstream from the reservoir suggests the possibility of Cr(III) oxidation in natural conditions.
Journal title :
Applied Geochemistry
Serial Year :
2010
Journal title :
Applied Geochemistry
Record number :
2231829
Link To Document :
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