Study of Cadmium in calcareous soil columns by various salts dissolved in water

Heavy metal cadmium is one of impurities of chemical fertilizers in Iran. Deep penetration of cadmium in soils and groundwater polluted by this metal endangers public health. Studies have shown that a key factor in improving the bioavailability of cadmium salt and complex formation of chlorine - Cadmium prevents the rapid absorption of cadmium in soil and sediment. In this study, calcareous soil was selected with sandy loam texture. 2.5 kg of soil was poured into the polyethylene tubes with a diameter of 12 cm and height of 30 cm. the samples were added to the soil columns equal to several times the capacity of solutions containing 100 m equivalent different salts and 10 m equivalent cadmium. Water head of the columns level was variable pressure. Treatments included calcium chloride, sodium chloride, sodium sulfate and distilled water (control). Output solution was collected at a rate of 250 ml in 10 steps. The results showed that the solubility of cadmium in the presence of calcium chloride has the maximum value compared with two sodium chloride and sodium sulfate salts.