STUDY ON CADMIUM FORMS IN WASTEW ATER-IRRIGATED SOIL WITH 115+115mCd
利用放射性同位素115+115mCd对两种污灌土壤中不同形态镉的研究

Experimental results were obtained by using tracer of 115+115mCd after the method of Yoji Sonoda and Silvera, D. J., Soil samples were collected at two wastewater-irrigated areas, one being acid meadow brown soil in Shenyang, and the other solonized light meadow soil in Tianjin.Experimental results are summarized as follows:1. 54-72% of Cd exists in exchangeable form in these soils.2. The rate of alkali-soluble form is increasing and the rate of exchangeable form is decreasing with increase of pH, This is in accord with results of Yoji Sonoda.3. For extraction of available form of Cd in alkaline soil, a 0.005M solution of DTPA is preferred, because extraction is not complete with 0.1N HCl by Yoji Sonoda's.