Content and Chemical Forms Distribution of Cd in Farmland Soil and Potatoes in Zinc Smelting Area
FU Hai-bo
ZENG Yan
CHEN Jing-an
DONG Ze-qin
Abstract：The content and chemical forms distribution of Cd in farmland soil and roots,stems, leaves and tubers of potato in zinc smelting area in Hezhang county were studied using sequential chemical extraction method.The results showed that,Cd content in farmland soil ranged from 2.53-22.30 mg/kg,Cd mainly existed in the form of exchangeable fraction and Fe-Mn oxides fraction;the soil pH value was significantly negatively correlated with the content of Cd in the form of exchangeable fraction,and significantly positively correlated with the content of Cd in the form of Fe-Mn oxides fraction in soil.The contents of Cd in roots,leaves,stems were higher than that in tubers.NaCl-extractable and H2 O-extractable Cd were dominant in each organ of potato. Except the tubers,Cd contents in roots,stems and leaves of potato exceeded the food safety limits of national standard,had higher ecological risk.The pH value of soil was significantly negatively correlated with the content of Cd in roots and stems of potato,the significant positive correlations were found between organic matter content of soil and the content of Cd in leaves of potato,and between the content of Cd in roots and the content of Cd in stems of potato.Overall,soil pH value was an important factor affecting Cd uptake in plants,which mainly affected the migration of Cd to the potatoes through the influence of chemical forms in the soil.To ensure the quality and safety of local foods,the ability of Cd in soil transfering to plant and the contents of Cd in crops could be reduced through controlling the pH value of soil.
Keywords：farmland soilpotatochemical forms of cadmiumzinc smelting
Publication Date：2014-01-01
Online Publishing Date：2026-09-12(First online date of this platform, not the publication date of the document)
Pages：6( 66-71 )