Faculty of Science, Liverpool John Moores University, Liverpool L3 3AF, UK.
Environ Pollut. 2010 Jan;158(1):155-60. doi: 10.1016/j.envpol.2009.07.021. Epub 2009 Aug 14.
Three methods for predicting element mobility in soils have been applied to an iron-rich soil, contaminated with arsenic, cadmium and zinc. Soils were collected from 0 to 30 cm, 30 to 70 cm and 70 to 100 cm depths in the field and soil pore water was collected at different depths from an adjacent 100 cm deep trench. Sequential extraction and a column leaching test in the laboratory were compared to element concentrations in pore water sampled directly from the field. Arsenic showed low extractability, low leachability and occurred at low concentrations in pore water samples. Cadmium and zinc were more labile and present in higher concentrations in pore water, increasing with soil depth. Pore water sampling gave the best indication of short term element mobility when field conditions were taken into account, but further extraction and leaching procedures produced a fuller picture of element dynamics, revealing highly labile Cd deep in the soil profile.
三种预测土壤中元素迁移能力的方法已应用于受砷、镉和锌污染的富铁土壤。在田间从 0 到 30 厘米、30 到 70 厘米和 70 到 100 厘米的深度采集土壤，并从相邻的 100 厘米深的沟渠中采集不同深度的土壤孔隙水。连续提取和实验室柱浸出试验与直接从田间采集的孔隙水样品中的元素浓度进行了比较。砷的提取率低、淋出率低，在孔隙水样品中的浓度较低。镉和锌的迁移性更强，在孔隙水中的浓度更高，且随土壤深度的增加而增加。考虑到田间条件，孔隙水采样最能说明短期元素迁移能力，但进一步的提取和淋滤程序提供了元素动态的更全面的情况，揭示了土壤剖面深处高度不稳定的 Cd。
