几种金属元素进入土壤后的迁移转化规律及吸附机理的研究

为提出合理的污灌水质标准,人们对有毒金属在土壤中的迁移转化规律进行了许多研究。但这些研究都侧重于宏观的量变方面,对微观的质变研究却不多,本研究采用电子能谱等现代化仪器,对毒害最大的五种

Transport and Transformation of Some Heavy Metals in Soil and Research of Their Adsorption Mechanism

Transport and transformation of Pb, Hg, Cd, As and Cr in soil and their adsorption mechanism researched by using scanning electron microscope and electron energy spectrometer is presented in this paper. The results show that the speciation and valence states of the five metals and their distribution in soil are different. The adsorption rates and stability are orderly as follows:Pb Hg Cd As Cr. The mechanism observed in the experiments is that Pb a nd Hg are adsorbed chemically, Cd physicochemistically, and As and Cr physically in majority.