Distribution and human health hazard appraisal with special reference to chromium in soils from Peenya industrial area, Bengaluru City, South India

The study area is polluted, mainly with Chromium, whereas environmental risk is limited to a small part of it. This study can be used as a reference point to develop future long-term risk assessment plans on the probable movement of heavy metals in urban soils to human beings.

Twelve soil samples during July-2016 were taken from Peenya industrial sites at different depth viz., 0-Hft., 1-3 ft., and 3-5 ft. heavy metals (As, Cd, Co, Cr+3, Cu, Fe, Mn, Pb, Sr, V, and Zn) were determined by inductively coupled plasma mass spectrometry (ICP-MS). Contamination Factor, Enrichment Factor, Pollution Index, Modified Pollution Index, indices of pollution, Toxic Unit (TU), Hazard Quotient (HQ), Hazard Index (HI), Total Hazard Index (THI), Cancer Risk (CR), and Lifetime Cancer Risk (LCR) were used to evaluate the environmental and potential health hazard risks of human beings.

Presence of heavy metals in Peenya industries is considered a major environmental and human health risk. The purpose of this research is to determine the concentrations of trace elements in urban industrial soils in north Bengaluru in order to assess the degree of soil pollution and to evaluate environmental and human health risk.

Results showed that Cr+3 concentration exceeded the threshold limit of 60 mg/kg and 66.66%, 50%, and 41.66% showing more than the threshold limit at 0-1 ft., 1-3 ft. and 3-5 ft. depth soil samples. Single pollution indices showed that the study site was contaminated with chromium concentration. Nemerow pollution index showed that majority of soil samples were in the very high level of pollution. THI values showing <1 indicating that there were non-carcinogenic risks for children and less risk for adults. Based on LCR for children, 100% of soil samples were at high risk. LCR for Cr+3 concentrations of the soils were found higher than the threshold value of 1.00E-04, indicating a significant carcinogenic risk. Conclusions: The study area is polluted, mainly with Chromium, whereas environmental risk is limited to a small part of it. This study can be used as a reference point to develop future long-term risk assessment plans on the probable movement of heavy metals in urban soils to human beings.