engleski

The labile metal concentrations in Sava River water assessed by diffusive gradients in thin films

DGT devices (diffusive gradients in thin films) were introduced as a new tool for the assessment of the labile metal concentrations in the surface water of the Sava River in Croatia. DGT deployments were carried out at five locations, and lasted for 13–36 days. Performance evaluation in two seasons (autumn 2005 and spring 2006) revealed that reliable measurements can be achieved in the autumn period even after long-term DGT deployments while in the spring period, reproducibility was seriously affected by resin contamination with algae and particles. In the autumn period, the highest DGT-labile concentrations were measured for Fe, Mn and Zn (13.7±25.4μg L−1, 8.24± 10.6μg L−1, and 1.86± 0.85 μg L−1, respectively), the intermediate for Ni and Cu (0.232 ± 0.021 μg L−1 and 0.166± 0.062 μg L−1, respectively), and the lowest for Cr, Co, Pb and Cd (0.033 ± 0.018 μg L−1, 0.022 ± 0.009μg L−1, 0.020 ± 0.008 μg L−1 and 0.0016± 0.0009 μg L−1, respectively). Increased concentrations of several metals, namely Co, Cr, Mn and Fe, were found at the location downstream of the municipal sewage outlet, pointing out to detrimental effect of the point source of pollution on surface water quality. Nevertheless, DGT-labile metal concentrations in the selected section of Sava River were mostly comparable with the concentrations previously reported for unpolluted rivers.

diffusive gradients in thin films ; metals ; labile concentration ; Sava River ; water

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