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The economic development of the society towards large-scale urbanization and industrialization is leading to production of huge quantities of wastewaters (Singh & Agrawal, 2008). Wastewaters can be used for the restoration of degraded land (Madejo n et al., 2006), and the growth of vegetation having commercial and environmental value (Aggeli et al., 2009). Establishment of tree plantations following wastewater irrigation has been a common practice for many years (Kalavrouziotis & Arslan-Alaton, 2008). Several researches of wastewater irrigated plantations in many countries such as India (Bhati & Singh, 2003; Singh & Bhati, 2005), Australia (Sharma & Ashwath, 2006), New Zealand (Guo et al., 2002; Kimberley et al., 2003), Sweden (Hasselgren, 2000), Canada (Cogliastro et al., 2001), Hungary (Vermes, 2002), etc. are available. In Iran, huge section of useful water of major metropolitan cities converts to the municipal wastewater (Tajrishi, 1998). Since the deficiency of access to adequate water for irrigation is a matter of increasing concern and limiting factor to develop plantation, therefore municipal wastewater could be utilized as an important source of water for expansion of tree plantations in and around the city and industrial complexes (Al-Jamal et al., 2000; Kalavrouziotis & Apostolopoulos, 2007; Salehi et al., 2007). This practice not only reduces the toxicity of soil and plays an important role in safeguarding the environment, because woody species may utilize wastewater and uptake heavy metals through extensive root systems and retain them for a long time (Madejo n et al., 2006), but it also creates opportunities for commercial biomass production and sequestration of excess minerals in the plant system (Sharma & Ashwath, 2006). Again, wastewaters may contain amounts of potentially harmful components such as heavy metals and pathogens (Rattan et al., 2005; Toze, 2006). The effects of microbial pathogens are usually short term and vary in severity depending on the potential for human, animal or environmental contact (Toze, 2006), while the heavy metals have longer term impacts that could be a source of contamination and be toxic to the soil (Sharma et al., 2007) and plant (Gasco & Lobo, 2007). Hence if wastewater is to be recycled safely for irrigation, the problems associated with using it need to be known (Emongor & Ramolemana, 2004).

Heavy Metal Contamination of Zn, Cu, Ni and Pb in Soil and Leaf of Robinia pseudoacacia Irrigated with Municipal Wastewater in Iran