Assessment of heavy metal contamination in sediments of Shitalakhya river, Bangladesh
Sediment samples collected from Shitalakhya river, Bangladesh, were analyzed using AAS for spatial and seasonal (i.e., dry, pre-monsoon, post-monsoon) variation of Cr, Mn, Ni, Cu and Zn. The mean concentrations of Cr, Mn, Ni, Cu and Zn were 22.37 ± 0.78, 612.59 ± 15.31, 54.11 ± 1.62, 50.36 ± 1.02 and 103.62 ± 3.11 mg/kg in dry; 31.58 ± 0.95, 569.71 ± 17.09, 58.35 ± 1.75, 49.93 ± 1.01 and 22.37 ± 0.78 mg/kg in pre-monsoon; 18.09 ± 0.54, 567.02 ± 17.01, 50.89 ± 1.53, 39.75 ± 1.19 and 31.58 ± 0.95 mg/kg in post-monsoon, respectively. These results indicate that concentrations of the heavy metals were almost same in the three seasons, however, concentrations were slightly higher in dry and pre-monsoon than those in post-monsoon with respect to spatial variation. The high concentrations of Ni and Cu among the studied metals were due to use of oxides of these heavy metals as catalysts in urea plant. Assessment of the heavy metal contamination of the sediments was done through calculation of various statistical indices i.e., Pearson correlation matrix, geo-accumulation index (Igeo), contamination factor (Cf), degree of contamination (Cd), pollution load index (PLI) and ecological risk potential (RI) factors for Cr, Mn, Ni, Cu and Zn in sediments indicated that the contamination status in the studied area was low. However, the high concentrations of the heavy metals especially Ni and Cu than the TEL and TRV values suggesting unsafe to use the sediments for vegetation and other uses.
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