Chojnacka K, Chojnacki A, Górecka H, Górecki H
Institute of Chemical Engineering and Heating Equipment, Wrocław University of Technology, ul. Norwida 4/6 50-373 Wrocław, Poland.
Sci Total Environ. 2005 Jan 20;337(1-3):175-82. doi: 10.1016/j.scitotenv.2004.06.009.
The aim of this work was to estimate, on the basis of soil extraction procedures, whether a given soil is suitable for cultivation of plants used as food or feed. The paper discusses the transfer of metal ions (As, Cd, Cr, Cu, Hg, Mn, Ni, Pb, Zn) from contaminated soils to plants in terms of transfer factors (TF). The knowledge of transfer factors for a given element should enable prediction, before plants are sowed, whether a given soil is suitable for the cultivation of plants for consumption purposes. TF can only be evaluated when a linear relationship is observed between soil and plant composition for a given element. Such a relationship is rarely observed between the total soil content of a given metal and that of the plant. For this reason, it was necessary to develop an extraction procedure that would represent the content of metal available to plants during growing season. Several extracting agents were tested. The extracting agent that fulfilled these criteria was 2% (w/v) ammonium citrate. Statistically significant correlation coefficients were determined between the citrate-soluble fraction of soil and content in plant in the case of all the elements studied, except Ni. If a statistically significant correlation exists, it is then possible to evaluate the soil-plant transfer factor for a given metal in plants.
这项工作的目的是基于土壤提取程序来评估某一特定土壤是否适合种植用作食物或饲料的植物。本文从转移因子（TF）的角度讨论了金属离子（砷、镉、铬、铜、汞、锰、镍、铅、锌）从受污染土壤向植物的转移。对于某一特定元素，了解其转移因子应能在播种前预测某一特定土壤是否适合种植供消费用的植物。只有当观察到某一特定元素在土壤和植物组成之间存在线性关系时，才能评估转移因子。在某一特定金属的土壤总含量和植物总含量之间很少观察到这种关系。因此，有必要开发一种能代表植物生长季节可利用金属含量的提取程序。测试了几种提取剂。符合这些标准的提取剂是2%（w/v）柠檬酸铵。在所研究的所有元素中，除镍外，土壤中柠檬酸盐可溶部分与植物中含量之间均确定了具有统计学意义的相关系数。如果存在具有统计学意义的相关性，那么就有可能评估某一特定金属在植物中的土壤-植物转移因子。
