Abstract：A field survey including 36soil samples and 36crop samples of 9crop species was conducted to determine Diethylene triamine pentacetate acid (DTPA) extractable cadmium (Cd) and total content of Cd in soil and Cd contents in different parts of crops and its six different chemical forms in a farmland contaminated by Cd in a typical metal smelting area. The results showed that the concentrations of Cd in soil at the studied site all exceeded GB 15618-1995 (Grade Ⅱ); the average DTPA extractable Cd accounted for 63% of the total content of Cd in soil, which demonstrated higher Cd bioavailability of the soil; there were obvious crop species differences regarding Cd absorption and Cd accumulation in different edible parts of the crops is as leaf vegetable > root vegetable > bulb vegetable; Cd in crops mainly existed as pectates and protein binding or sorption Cd (NaCl extraction), and a significantly positive correlation was observed between DTPA extractable Cd in soil and available Cd in the roots of crops. In consideration of health risk, it was advised that DTPA extraction and bioavaliable form be used for measuring Cd polluted extents in soil and in crop respectively.
蔡楠, 肖青青, 许振成, 叶志鸿, 黄建洪, 陈晓燕, 陈婵. 基于土壤—农作物迁移途径重金属镉化学形态研究[J]. 中国环境科学, 2013, 33(增刊): 13-18.
CAI Nan, XIAO Qing-Qing, XU Zhen-Cheng, YE Zhi-Hong, HUANG Jian-Hong, CHEN Xiao-Yan, CHEN Chan. The chemical forms of Cadmium through soil-crop transport. CHINA ENVIRONMENTAL SCIENCECE, 2013, 33(增刊): 13-18.
