The distribution and fractionation of metals in the Seyhan River demonstrated significant differences among the sampling stations. Sediment metals were, individually, bound to different fractions at different concentrations at the six sampling stations for the two sampling events. Overall, the lowest total metal concentrations were found in samples from S-6. Chemical fractionation of the
metals showed that the characteristics of this furthest downstream station were substantially different than those of the more upstream locations. The residual fraction was the highest for all metals during October 2009. In contrast, non-residual fractions from the same stations were highest in June 2010. This temporal
difference may be linked to differences in the concentrations of organic matter in the sediment samples, which were 1.40% and 15.1% in October 2009 and June 2010, respectively. In summer, the flow coming from the drainage channel to the river has very high turbidity and hence high pollutant content. It is difficult to properly
address the possible reason(s) for the large seasonal difference in the organic matter content. Since there is only one appropriate sampling point available at that location, the sampling was carried out at the same point. Therefore, no sampling error has been expected. Calmano et al. (1993) reported a rather high proportion of metals were strongly bound to the organic/sulfides fraction. Several other studies reported a significant positive correlation between the adsorption affinity of heavy metals and organic matter content of sediments (Lin and Chen, 1998; Soares et al., 1999).
The distribution and fractionation of metals in the Seyhan River demonstrated significant differences among the sampling stations. Sediment metals were, individually, bound to different fractions at different concentrations at the six sampling stations for the two sampling events. Overall, the lowest total metal concentrations were found in samples from S-6. Chemical fractionation of the
metals showed that the characteristics of this furthest downstream station were substantially different than those of the more upstream locations. The residual fraction was the highest for all metals during October 2009. In contrast, non-residual fractions from the same stations were highest in June 2010. This temporal
difference may be linked to differences in the concentrations of organic matter in the sediment samples, which were 1.40% and 15.1% in October 2009 and June 2010, respectively. In summer, the flow coming from the drainage channel to the river has very high turbidity and hence high pollutant content. It is difficult to properly
address the possible reason(s) for the large seasonal difference in the organic matter content. Since there is only one appropriate sampling point available at that location, the sampling was carried out at the same point. Therefore, no sampling error has been expected. Calmano et al. (1993) reported a rather high proportion of metals were strongly bound to the organic/sulfides fraction. Several other studies reported a significant positive correlation between the adsorption affinity of heavy metals and organic matter content of sediments (Lin and Chen, 1998; Soares et al., 1999).
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