The Analysis of Lead and Cadmium Accumulation in Lettuce (case study: Varamin)

The accumulation of metals and the contamination of agricultural soils, which is mostly the result of humans’ activities, are among the most important environmental issues throughout the world. Due to the use of chemical fertilizers, pesticide, and municipal and industrial wastewaters, heavy metals accumulate in plants. Vegetables have high abilities to absorb and stock heavy metals, and regarding the high use of lettuce, the control of amounts of heavy metals in it can be essential for consumers’ health. In this research, nine samples of lettuce were chosen randomly from three farms located in Varamin City in the spring of 2014, and after sampling and preparation by atomic absorption instrument, lead and cadmium concentration in it was measured. The average lead concentration in Jafarabad, Pakdasht, and Asgarabad Varamin is 0.23, 0.45, and 0.50, respectively. The average cadmium concentration in Jafarabad, Pakdasht, and Asgarabad Varamin is 0.06, 0.06, and 0.07, in the order mentioned. The average lead and cadmium concentration in Asgarabade Varamin is higher than other areas. Based on the achieved results, the concentration of cadmium and lead in all the area is acceptable for human use.