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Distribution, source identification, ecological and health risks of heavy metals in surface sediments of the Rupsa River, Banglades

Publication Date - 2018-12-21 00:00:00

Publication Title : Distribution, source identification, ecological and health risks of heavy metals in surface sediments of the Rupsa River, Banglades

Publicationed By : Dr. Md Saiful Islam

Publication Publication Date : 2018-12-21 00:00:00

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Publication Description :

The present study was conducted to assess the pollution level and distribution of heavy metals  and their ecological and health risk in sediments of the Rupsa River, Bangladesh. Heavy metals  were measured by using inductively coupled plasma mass spectrometer. The mean concentration  of Cr, Ni, Cu, As, Cd, and Pb in sediments was 25.26, 42.40, 68.81, 9.31, 3.78, and 32.57 mg/  kg, respectively. Metals in sediment during winter were higher than summer season.  Multivariate principal component analysis revealed significant anthropogenic contributions of Cr,  Ni, As and Cd in sediment. The enrichment factor (EF), geoaccumulation index (Igeo), pollution  load index (PLI), and contamination factor (Ci  f) demonstrated that most of the sediment samples  were heavily contaminated by Cd. The sum of toxic units in most of the sampling sites during  winter season was greater than 4, indicating a moderate to serious toxicity of heavy metals in  sediment. In view of the potential ecological risk, sediments of Rupsa River showed low to very  high potential ecological risk. The chronic daily intake of metals were higher than oral RfD  which was the result of metal contamination. The total hazard index for adult and children,  about 100% sampling location possess (HI > 1) indicating pose non-cancer risk. The carcinogenic  risks from As and Pb at all sites via ingestion and dermal contact were higher than  acceptable ranges (104). This study suggested that more attention should be directed to the  comprehensive risk assessment of heavy metals of this riverine aquatic environment.

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