Water quality, physicochemical, heavy metal content, and health risk assessment of borehole-water from selected mining communities in Ghana

Abstract

Unregulated mining drives considerable long-term soil and water pollution with increased health risks to humans and other organisms. The main objective of this study is to assess the water quality, physicochemical parameters, heavy metal content, and health risks of borehole water from selected mining communities in Ghana. Quality parameters of 56 borehole water samples collected from 19 mining communities in the Amansie West District, Ghana were carried out. The study is one of the few studies to be carried out in the district because of its breadth of communities, depth of analysis, and scale of health risk assessments performed. Physicochemical parameters including pH, conductivity, turbidity, total dissolved solids, and color were evaluated using standard and appropriate methods. Additionally, arsenic, cadmium, lead, and mercury were evaluated using an atomic absorption spectrometer. Observed mean physicochemical parameters varied from 5.1 to 6.5 pH, 59.3 to 325 μS/cm conductivity, 1.4 to 86.4 NTU turbidity, 32.5–214 mg/L total dissolved solids, and 2.5–250 Hz color. Also, the mean concentration of the heavy metals varied from 1.6 ± 2.24 to 169.14 ± 2.18 μg/L arsenic, 0.6 ± 2.24 to 6.0 ± 0.71 μg/L cadmium, 1.25 ± 2.00 to 15.60 ± 1.11 μg/L lead and 0.025 ± 2.00 to 3.33 ± 0.17 μg/L mercury. There was no statistically significant link between arsenic, cadmium, lead, and mercury at 0.05 concentrations predicting source diversities. Though some samples met WHO quality standards, others were unsafe with increased health risks due to color, turbidity, acidity, and high arsenic issues. In conclusion, this study observed an increased health risk in some selected sampled communities due to exposure to mining-influenced contaminations from heavy metals and particulate matter. This implies that without urgent mining waste disposal regulations, scarcity of quality water and increased risk to health issues could be imminent.