Solution composition to influence cadmium mobilization in soil
To investigate the effect of soil solution compositions on Cd mobility in soil, an experiment was conducted using NaCl, NaNO<,3>, CaCl<,2> and Ca (NO<,3>)<,2> with four levels of 0, 0.025, 0.05 and 0.1M, based on Cl or NO<,3> concentrations and three replicates. The results showed that the effect of Cl on Cd mobilization in soil was clear in all treatments containing Cl, regardless of the electrolyte type. Increase Cl concentrations increased the amount as well as the depths of Cd accumulations in soil columns compared to treatments without Cl. The experiment results also indicated that Cd was only moved to the depth of 5cm for Na but to the depth of 10cm for Ca containing treatments which was shown to be significantly different. The results also revealed that Cd concentrations in similar soil depths were greater in Ca(NO<,3>)<,2> compared to NaNO<,3>. It also found that Cd accumulations depths in soil were significantly greater for all levels of Ca(NO<,3>)<,2> compared to 0 level. It concluded that increased Cd mobilization in the presence of Cl treatments was due to the formations of Cd-Cl complexes and decrease in Cd adsorption on soil surfaces. It also found that Ca can mobilize Cd more than Na, which was due to stronger competitions between Ca and Cd ions in the solution for soil sorption sites.
Cadmium Calcium Chloride Nitrate Sodium
Hadi Ghorbani
Department of Soil and Water, Shahrood University of Technology, Shahrood, Iran
国际会议
第九届痕量元素生物地球化学国际会议(9th International Conference on the Biogeochemistry of Trace Elements)
北京
英文
969-970
2007-07-15（万方平台首次上网日期，不代表论文的发表时间）