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Assessment of heavy metal contamination in street dust: concentrations, bioaccessibility, and human health risks in coal mine and thermal power plant complex

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Abstract

Coal mining has also been associated with adverse environmental and health impacts including cancer and respiratory disorders, with the presence of thermal power plants exacerbating the problem of heavy metal pollution. Minimal studies have been conducted on the environmental impacts, health risks, and bioaccessibility of heavy metals in coal mine areas. Consequently, samples of street dust were collected from different locations in the Singrauli mine complex and analysed. Heavy metals (Cu, Ni, Zn, Cr, Co, As, and Mo) were found to be higher than the background concentration, with the maximum concentration was found in areas close to the Thermal Power Plants, like Near Vindyachal TPP, Near Shakti Nagar TPP, and Anpara. The highest geo-accumulation index value was found for Co, Mo, Zn, and As, indicating moderate to strong pollution levels. Health risk assessment (for both adults and children) revealed that Cr and Fe posed significantly higher Hazard Quotient and Hazard Index (HI) values, indicating significant non-carcinogenic threats. Moreover, Carcinogenic Risk (CR) values for Cd, Cr, and Ni indicated a risk of carcinogenicity to the public exposed to road dust. The study also examined the bioaccessibility of the metals, which showed that the gastric phase accumulated a higher percentage of Ni (42.52%), Pb (34.79%), Co (22.22%), As (20%) and Cu (15%) than the intestinal phase. Strong positive correlation was observed between metal concentration (Cu, Pb, Cr, Fe, Zn, and Mn), HI, and CR of adult and child, while bioaccessibility of intestinal phase was positively correlated with gastric phase of metals (Cu, Ni, Co, As, and Mn).

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Acknowledgements

The authors thank Central Instrumentation Facility and Department of Civil Environmental Engineering, BIT-Mesra for providing facilities for sample analyses and giving reagents and glasswares.

Funding

Mala Kumari greatly appreciates the support from Birla Institute of Technology, Mesra, Ranchi for furnishing institute research fellowship [Ref. No.—DPGS/Ph.D/IRF/2022-23/75].

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MK: conceptualization, methodology, investigation, resources, data curation, writing—original draft preparation. AK: data curation, writing—original draft preparation. TB: supervision, conceptualization, methodology, resources, visualization, writing—review & editing.

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Correspondence to Tanushree Bhattacharya.

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Kumari, M., Kumar, A. & Bhattacharya, T. Assessment of heavy metal contamination in street dust: concentrations, bioaccessibility, and human health risks in coal mine and thermal power plant complex. Environ Geochem Health 45, 7339–7362 (2023). https://doi.org/10.1007/s10653-023-01695-5

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