Geospatial distribution of metal(loid)s and human health risk assessment due to intake of contaminated groundwater around an industrial hub of northern India
Tóm tắt
The study focused on analyzing concentrations of metal(loid)s, their geospatial distribution in groundwater around an industrial hub of northern India. Human health risk posed due to the intake of contaminated groundwater was also evaluated. For this, 240 samples were assayed using inductively coupled plasma emission spectrophotometer. For risk assessment, the methodology proposed by US Environmental Protection Agency was adopted. Geometric mean of Al, As, Mo, Cd, Co, Cr, Fe, Mn, Ni, Pb, Se, and Zn was 193.13, 27.35, 4.22, 2.85, 92.81, 14.97, 271.78, 25.76, 54.75, 19.50, 16.94, and 1830.27 μg/l, respectively. Levels of Al (84%), As (63%), Ni (63%), Pb (49%), and Se (41%) exceeded the Bureau of Indian Standards (BIS). Principal component analysis is accounted for ~ 88% of the total variance and reflected pollution loads of Al, As, Mo, Cr, Fe, Se, and Pb in the groundwater. Based on it, four sources of metal(loid)s, namely geogenic (34.55%), mixed (industrial and agricultural, 26.76%), waste dumping (15.31%), and industrial (11.25%) were identified. Semi-variogram mapping model demonstrated significant geospatial variations of the metal(loid)s. Hazard index (HI) suggested potential non-carcinogenic risks to the inhabitants due to As, Al, Ni, Se, and Pb, which were the largest contributors. Based on maximum concentrations of metal(loid)s, HI for child and adult was above unity. Arsenic was identified as the most hazardous pollutant that may have chronic carcinogenic health implications. At western side of study area, carcinogenic health risks exceeded critical threshold of 1 × 10−4, indicating that As posed health risks to residents by intake of groundwater.
Tài liệu tham khảo
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