Frančišković-Bilinski, Stanislav
Detection of coal combustion products in stream sediments by chemical analyses and magnetic susceptibility measurements.
In: Znanstveni susreti 3. vrste
(7 July 2011 - 8 July 2011)
Zagreb, Hrvatska.
(Unpublished)
Abstract
Coal slag and ash, obtained by coal combustion in textile factory in Duga Resa (Croatia) was discharged directly to clean and tufa-forming Mrežnica River for 110 years (1884-1994). It is mixed with water and transported to Korana River and further downstream Kupa River, altogether about 50 km from pollution source. Out of 54 elements determined by ICP-MS in sediment fraction <2 mm, a series of major and trace elements, which have anomalous concentrations in Mrežnica River, have been pointed. Geoaccumulation index (Igeo) was calculated for all anomalous elements in anomalous region: Hg (1.88); B (4.05); Na (1.44); Al (2.05); V (1.65); Cr (1.20); Fe (1.18); Ni (2.10); Cu (2.37); Sr (0.97); Zr (3.27); Mo (3.34) and U (4.03). Low-field magnetic susceptibility (MS) was measured for each sample. Igeo for MS in anomalous region is 5.85. Correlation analysis showed good correlation (>0.90) of MS with: B (0.96); U (0.95); Zr (0.94); Sr (0.93); Na (0.92); Mo (0.92) and Ni (0.90). Cluster analysis of R-modality shows that MS is connected with B, Mo, Na and U on a separate branch on dendogram. Low correlation of MS with Fe (0.36) suggests that Fe in stream sediments is not in ferromagnetic form. Neither maghemite, nor magnetite could be identified by XRD. MS provides an indicator for river sediment contamination by coal slag and ash, although it cannot be prescribed to one single element. The need for further study of chemical reactions and redox processes in stream sediments contaminated by coal combustion products is highlighted.
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