Assessment of soil heavy metal pollution and associated ecological risk of agriculture dominated mid-channel bars in a subtropical river basin

Abstract

The elevated concentrations of heavy metals in soil considerably threaten ecological and human health. To this end, the present study assesses metals pollution and its threat to ecology from the mid-channel bar’s (char) agricultural soil in the Damodar River basin, India. For this, the contamination factor (CF), enrichment factor (EF), geoaccumulation index (Igeo), pollution index, and ecological risk index (RI) were measured on 60 soil samples at 30 stations (2 from each station, i.e., surface and sub-surface) in different parts of the mid-channel bar. The CF and EF indicate that both levels of char soil have low contamination and hence portray a higher potential for future enrichment by heavy metals. Moreover, Igeo portrays that soil samples are uncontaminated to moderately contaminated. Further, pollution indices indicate that all the samples (both levels) are unpolluted with a mean of 0.062 for surface soils and 0.048 for sub-surface soils. Both levels of the char have a low potentiality for ecological risk with an average RI of 0.20 for the surface soils and 0.19 for the sub-surface soils. Moreover, Technique for order preference by similarity to ideal solution (TOPSIS) indicates that the sub-surface soils have lower pollution than the surface soils. The geostatistical modeling reveals that the simple kriging technique was estimated as the most appropriate interpolation model. The present investigation exhibits that reduced heavy metal pollution is due to the sandy nature of soils and frequent flooding. However, the limited pollution is revealed due to the intensive agricultural practices on riverine chars. Therefore, this would be helpful to regional planners, agricultural engineers, and stakeholders in a basin area.

Are Indexes of Ecological Risk Associated with Trace Metals Relevant for the Characterization of Mine Tailings and Polluted Soils in the Katangese Copperbelt (DR Congo) and for Assessment of the Performance of Remediation Trials

“…For example, the DC and RI values of mining wastes were 2 to 170 times (DC: 72-5440) the threshold of 'high contamination' (DC > 32) and 1 to 270 times the threshold for 'very high risk' (RI = 549-162 091). Such high levels of DC and RI are rarely reported in the literature [65][66][67][68][69] and would place KCB among the most trace-metal-polluted regions in the world. These results support the exceptionally high levels of trace metal exposure in KCB populations as reported by several authors over the past 15 years [13,14,16,17].…”

Are Ecological Risk Indices for Trace Metals Relevant for Characterizing Polluted Substrates in the Katangese Copperbelt (DR Congo) and for Assessment of the Performance of Remediation Trials?

“…For example, the DC and RI values of mining wastes were 2 to 170 times (DC: 72-5440) the threshold of "high contamination" (DC > 32) and 1 to 270 times the threshold for "very high risk" (RI = 549-162,091). Such high levels of DC and RI are rarely reported in the literature [67][68][69][70][71][72][73] and would place KCB among the most trace-metal-polluted regions in the world. In line with the high DC and RI, all the studied soils and discharges show very high average concentrations when compared with international reference threshold values [54,58].…”

Investigating Natural Polymer Nanocomposites in Relation with Eco-Friendly Potential in Environmental Contexts

“…Additionally, microorganisms are included in the PM 2.5 category along with hazardous gases, heavy metal atoms, and other organic pollutants like benzene, aerosols, and polycyclic aromatic hydrocarbons. category, significantly impacting the environment [23]. Conventional filters are characterized by low porosity (typically <30%) and are constructed from porous materials with small pore sizes.…”