Total and available amounts of Cd, Ni, Zn, Pb, and Cu have been measured in the soil and plants samples of southern Tehran agricultural land for three years.
These areas are irrigated by domestic and industrial wastewater. Results of this study indicate that concentrations of these metals are
higher than control samples, taken from untreated lands.
Due to concentration of these elements in tissues of vegetables
consume by the residents of Tehran. Therefore, it is recommended that
the use of wastewater for irrigation to be halted.