Source Identification of Cd and Pb in Typical Farmland Topsoil in the Southwest of China: A Case Study

Cd and Pb in farmland topsoil are controlled by many factors. To identify the source of potential toxic metals around Mianyuan River, chemical analysis multivariate statistical performed this study. The results indicate following: (1) concentration soil exceed background value Chinese elements. (2) is significantly enriched whole region locally enriched, both them more or less influenced human activities. (3) contents increase following flow direction river. (4) isotope indicates that main include air dust, coal phosphate plant, contribution decreases successively. (5) Linear correlation principal component show sources mining rock, plant mining.