Mahanadi is one of the major rivers of peninsular India. Like other Indian rivers, it is contaminated with sewages, industrial discharges, and agricultural runoff. Thus, necessity was felt to monitor its pollution status. Present work was part of that program and aimed to assess the sediment contamination due to the trace metals Cd, Cr, Cu, Mn, Pb, and Zn during 2012–2015. Sediment pollution status and ecological risks were evaluated calculating contamination factor (CF), geo-accumulation (I_geo), pollution load index (PLI), potential ecological risk (EⁱR), etc. The recorded metal concentrations were Cd BDL of flame mode of AAS; Cr BDL - 73.9; Cu BDL - 44.4; Mn 37.2 - 1887.0; Pb BDL - 29.5; and Zn BDL - 92.5 mg kg⁻¹. As per US EPA guidelines, Cr concentrations at many locations were in the moderately polluted range. I_geo, CF, mC_d, PLI, and EⁱR indicated low pollution levels and low ecological risks due to the trace metals assessed. The sediment quality guidelines (SQGs) indicated that Cr and Cu concentrations exceeded (16% sample) the threshold effect concentrations and may occasionally exhibit adverse biological effects. The association of sediment organic matter, conductivity and content of Cu, and their grouping in component 1 of PCA revealed that the anthropogenic input was dominant and so also the component 2 where Cr exhibited moderately good correlation with organic matter. Cluster analysis of the sampling sites based on pollution status yielded 3 groups: relatively uncontaminated (S3, S4), low to moderately contaminated (S2), and moderately contaminated (S1, S5, S6) stretches.

Mahanadi是印度半岛的主要河流之一。像其他印度河流一样，它受到污水，工业废水和农业径流的污染。因此，有必要监测其污染状况。目前的工作是该计划的一部分，旨在评估2012-2015年期间由于微量金属Cd，Cr，Cu，Mn，Pb和Zn造成的沉积物污染。通过计算污染因子（CF），地质累积量（I _geo），污染负荷指数（PLI），潜在生态风险（E ⁱ R）等来评估沉积物的污染状况和生态风险。记录的金属浓度为火焰的Cd BDL AAS模式；铬BDL-73.9; 铜BDL-44.4; 锰37.2-1887.0; 铅BDL-29.5; 和Zn BDL-92.5 mg kg ^-1。根据美国EPA指南，许多地方的Cr浓度处于中等污染范围内。I _geo，CF，mC _d，PLI和E ⁱR表示由于评估了痕量金属而导致的低污染水平和低生态风险。沉积物质量指南（SQGs）表明，Cr和Cu的浓度超过了阈值影响浓度（样品的16％），并可能偶尔表现出不利的生物学影响。沉积物有机质，电导率和Cu含量的关联及其在PCA组分1中的分组表明，人为输入占主导，因此Cr与有机质具有适度良好相关性的组分2也是如此。根据污染状况对采样地点进行的聚类分析产生了三类：相对未污染的区域（S3，S4），低至中度污染的区域（S2）和中度污染的区域（S1，S5，S6）。