Department of Soil Science and Soil Protection, Faculty of Agrobiology, Food and Natural Resources, Czech University of Life Sciences Prague, Kamýcká 129, 165 21 Praha 6, Czech Republic.
J Hazard Mater. 2013 Apr 15;250-251:265-71. doi: 10.1016/j.jhazmat.2013.01.076. Epub 2013 Feb 8.
The study deals with the environmental stability of Tl-modified phases (ferrihydrite, goethite, birnessite, calcite and illite) and phytoavailability of Tl in synthetically prepared soils used in a model vegetation experiment. The data presented here clearly demonstrate a strong relationship between the mineralogical position of Tl in the model soil and its uptake by the plant (Sinapis alba L.). The maximum rate of Tl uptake was observed for plants grown on soil containing Tl-modified illite. In contrast, soil enriched in Ksat-birnessite had the lowest potential for Tl release and phytoaccumulation. Root-induced dissolution of synthetic calcite and ferrihydrite in the rhizosphere followed by Tl mobilization was detected. Highly crystalline goethite was more stable in the rhizosphere, compared to ferrihydrite, leading to reduced biological uptake of Tl. Based on the results obtained, the mineralogical aspect must be taken into account prior to general environmental recommendations in areas affected by Tl.
该研究涉及 Tl 改性相（水铁矿、针铁矿、钙锰矿、方解石和伊利石）的环境稳定性以及在模型植被实验中使用的合成土壤中 Tl 的植物可利用性。这里呈现的数据清楚地表明，Tl 在模型土壤中的矿物位置与其被植物（白芥）吸收之间存在很强的关系。在含有 Tl 改性伊利石的土壤上生长的植物中观察到 Tl 吸收的最大速率。相比之下，富含 Ksat-钙锰矿的土壤释放和植物积累 Tl 的潜力最低。在根际检测到合成方解石和水铁矿的根诱导溶解，随后 Tl 被活化。与水铁矿相比，高度结晶的针铁矿在根际更稳定，导致 Tl 的生物吸收减少。根据获得的结果，在针对受 Tl 影响的地区提出一般环境建议之前，必须考虑矿物学方面。
