تعيين فلزات سنگين كادميوم و سرب در سبزي هاي خوراكي كاهو، نعناع و تره كشت شده در اراضي مختلف جنوب تهران

Determination of Cadmium and Lead in Lettuce, Mint and Leek C Cultivated in Different Sites of Southern Tehran

Introduction: Contamination of vegetables by heavy metals namely cadmium and lead might create some health problems. In this project, the concentrations of lead and cadmium in some vegetables, which were cultivated in five regions of southern Tehran, were assessed. Materials and Methods: Concentrations of cadmium and lead were determined after digestion through microwave by ICP- AES and GFAAS. The LODs were calculated 0.12 Mgg-1 and 0.06 |Mgg-1 for lead and cadmium respectively and repeatability of the whole procedure expressed, as the RSD were 1.56% and 0.3% for lead and cadmium, respectively. 0 Results: Highest contamination of lead and cadmium were found in leek samples (0.14 mg/ kg and 0.15mg/kg, respectively) which were higher than the European Union permissible values for human consumption (0.1mgkg -1 fresh weight). Conclusion: In this study significant differences were found among the mean concentration of cadmium for three samples of leek, lettuce and mint in five regions (P<0.05) , but this was not observed for Pb.