Genotoxic risk assessment of drinking water consumed in the city of Tehran, Iran.

Two hundred liters of drinking water of the city of Tehran were collected as tap water in a glass container and passed through a XAD-2 resin column at a flow rate of 60-100 ml/minute. The adsorbed materials were eluted with acetone, dried and dissolved in 2 ml dimethylsulfoxide (DMSO). Doses up to 10 microliters did not elevate sister chromatid exchanges (SCE) in CHO fibroblasts, while 20 microliters caused a significant increase in SCE. However, this dose did not show any chromosomal aberration (CA) in V79 fibroblasts. Doses up to 50 microliters of the extract did not increase his+ spontaneous revertant colonies in Salmonella typhimurium tester strain TA98, TA100 and TA102 in the absence of S9 metabolizing mixture, neither induced DNA alkaline labile sites in V79 fibroblasts.