Geochemical distribution and mobility of heavy metals in sediments of urban streams affected by combined sewer overflows

0360299 - ÚH 2012 RIV SK eng J - Journal Article
Hnaťuková, Petra
Geochemical distribution and mobility of heavy metals in sediments of urban streams affected by combined sewer overflows.
Journal of Hydrology and Hydromechanics. Roč. 59, č. 2 (2011), s. 85-94. ISSN 0042-790X. E-ISSN 1338-4333
R&D Projects: GA AV ČR IAA200600902
Institutional research plan: CEZ:AV0Z20600510
Keywords : sediments * heavy metals * urban streams * sequential extraction * combined sewer overflows
Subject RIV: BK - Fluid Dynamics
Impact factor: 0.340, year: 2011

Study was undertaken to assess the impact of combined sewer overflows (CSOs) on distribution and mobility of heavy metals in sediments of streams in Prague, Czech Republic. Contents of total and extractable heavy metals (Cu, Zn, Pb, Cd, Cr and Ni), mineralogical phases and other sediment properties were measured in 44 surficial sediment samples. The observed mobility order of metals was Cd > Zn > Ni > Cu > Pb > Cr. There was a considerable increase in Zn mobility and increase of Cu associated with the oxidisable fraction in the sediments below CSO discharges. Cd was revealed as the most mobile heavy metal with percentages of extraction of approximately 40–60% in acid soluble fraction. Pb was mainly found in reducible fraction associated with Fe/Mn (oxi)hydroxides. In terms of environmental significance, Cd and Zn can be particularly mobile and bioavailable under acidic conditions, because they are predominantly bound in labile fractions.
Permanent Link: http://hdl.handle.net/11104/0006477