Assessment of risk human health induce to chrome, nickel, lead and cadmium of the tap water; Jask City, Iran

Entrance of such toxic heavy metals as Cd, Cr, Mn, Pb, As and Ni of a high concentration into drinking water sources due to the exhaustion of municipal or industrial wastewater can be hazardous for human health. In the present study,120 samples of tap water were collected from 8 regions of Jask town during winter season, 2013. Concentration of heavy metals (Cr, Ni, Pb and Cd) was measured via a spectrophotometer model DR2800. Then, using the existing equations, human health state of male and female adults, children and infantswere measured under the effect of the heavy metals. The mean concentration of these heavy metals are 24.11±4.8, 45.7±6.2, 4.8±.33 and 1.61±.39 μg/l, respectively. Moreover, the concentration of Ni is significantly higher than Cr, Pb and Cd (p value infants>female adults > children. Alsofor Cr, Cd and Ni this order is: male adults > female adults > infants > children. The mean concentration of Cr, Ni, Pb and Cd in the tap water of Jask is lower than the standards set by WHO and EPA. Since the HQ of such heavy metals as Cr, Ni, Pb and Cd is less than 1, it could be said that alltap water consumers in Jask are within the safe and secure domain in terms of human health risk.