Abstract
The present study aimed to evaluate the potential toxic heavy metal (PTHM) concentrations and associated ecological and health risk of nearby inhabitants (child and adult populations) of the Bokaro thermal power station (BTPS), Jharkhand, India. The fly ash containing PTHMs is released from the thermal power plant and contaminates the soil of the nearby agricultural area, roadside area and residential area. Furthermore, PTHMs cause ecological risk as well as carcinogenic health effects in adults. Inhabitants are exposed to PTHMs through exposure pathways (for instance, direct ingestion, dermal contact and air inhalation), and PTHMs were examined in this study by calculating the estimated daily intake (EDI). The contamination factor (Cf) of Cd exceeded the threshold value throughout the study area, whereas the Cf of Hg was observed higher only in roadside soil (RSS). The geoaccumulation index (Igeo) of Cd was higher in the top soil of agricultural soil (AS) (7.39) and RSS (9.38). The level of PTHMs was monitored slightly higher in the topsoil of RSS. The ecological risk index (Eri) was detected to be the highest in RSS (1628.9). The permissible limit of Cd (0.05 mg kg−1) and Pb (0.1 mg kg−1) for all sampled vegetables and grain crops was surpassed. The transfer factor (TF) of the studied vegetables and grain crops was in the order of Cd > Cr > Pb > Hg > As. The results of the present study concluded that the hazard quotient (HQ) values for all PTHMs analysed in soil throughout the study area were < 1, which indicates that the child population was within the safe limit. However, the adult population was at a high risk of non-carcinogenic health effects due to increased permissible limits of Cd, Pb and Cr in vegetables and grain crops whereas the target carcinogenic risk (TCR) of Pb and Cr was higher and indicated that there may be a health risk of cancer in adults.
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Acknowledgements
The authors would like to gratefully acknowledge IIT (Indian School of Mines) Dhanbad, for all the valuable support and needful facilities. The second author (Deep Shikha) is grateful to the Ministry of Human Resource Development (MHRD), Government of India (GoI), for providing PhD fellowship.
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Prasoon Kumar Singh: Investigation; conceptualization; writing—review and editing supervision. Deep Shikha: Writing—original draft; investigation; methodology; software; data curation; funding acquisition. Shivam Saw: Software; conceptualization; writing—review and editing; data curation.
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Singh, P.K., Shikha, D. & Saw, S. Evaluation of potential toxic heavy metal contamination in soil, fly ash, vegetables and grain crops along with associated ecological and health risk assessment of nearby inhabitants of a thermal power station in Jharkhand (India). Environ Sci Pollut Res 30, 7752–7769 (2023). https://doi.org/10.1007/s11356-022-22638-0
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DOI: https://doi.org/10.1007/s11356-022-22638-0