[Genotoxicity of soil irrigated by wastewater using umu/SOS test].

umu/SOS test is used to screen the accumulation of genotoxic substances in soil irrigated with wastewater in urban Beijing. The relative genotoxicity is evaluated based on the weight of soil used for extraction that could result in a positive reaction (or the induction ratio R equals 2) and the characteristics of genotoxic substances could be evaluated by the slop of linear part of the dose/effect relationship, R reaches the maximum when the amount of soil in each cell is about 10 mg. In a case study on a wastewater or reclaimed water irrigation area, the genotoxicity of soil samples could be observed and it may be attributed to the accumulation of PAHs, according to relevant information.