几种土壤溶液中Cu,Pb,Cd的活度及其络合特性

Effects of Several Soil Solutions on the Activities of Cu,Pb,Cd and Complexation Character

介绍并用法测定几种不同生物气候带土壤溶液中 Cu,Pb,Cd 的活度及计算络合数值,并进行综合评价。研究了调节土壤 pH 值及施加改良剂 CaCO_3及 K_2HPO_4对 Cd 在土壤溶液中的活度及络合敬值的影响。结果表明:潜育泥炭土、碳酸盐褐土、浅色草甸土等北方土壤中 Cu,Pb,Cd 的活度较低,络合数值较高;而红壤、黄棕壤等南方上壤溶液中却得出相反的结果。同种供试土壤溶液对 Pb 的络合数值高于 Cu。改变 pH 值使不同土壤溶液对 Cu 的活度及络合数值影响不同。Cd 污染使大部分土壤溶液中 Cd 的活度升高,络合数值降低,而施加改良剂 CaCO_3与 K_2HPO_4却使大部分土壤溶液中 Cd 的络合物数值增加,但较对照土壤仍偏低,为土壤 Cd 污染的调控与治理提供依据。

Complexation character of soil solution is the total amount of complex compounds of certain metallic ion formed with all complex ions.mainly organic,existed in soil solution.Activities of Cu.Pb. Cd and complexation character values were influenced by complex ions in soil solution from several soils prevailed in different bio-climatical conditions and effects of pH and application of certain meliorating a- gents(such as CaCO_3 and K_2HPO_4)on the activities of Cu,Pb,Cd and complexation character values of different soils were studied.It was found that the activites of Cu,Pb.Cd were lower,but the values of heavy metals of glei-peaty soil,carbonate einnamon soil.light meadow soil in the northern part of China were higher than that of lateritic soils and yellow-brown soil in the south.Complexation character values of the same soil solution with Pb were higher than that with Cu.The effect of pH on complexation charac- ter values of different soils with different metallic ions differed from each other.No significant correlation was found.Application of CaCO_3 and K_2HPO_4 lowered Cd pollution of soils to certain degree.