Department of Agro-Environmental Chemistry and Plant Nutrition, Czech University of Life Sciences Prague, Prague, Czech Republic.
J Environ Sci Health B. 2012;47(4):336-42. doi: 10.1080/03601234.2012.640918.
The aim of the present study was to investigate tebuconazole sorption on common soil minerals (birnessite, ferrihydrite, goethite, calcite and illite) and humic acids (representing soil organic matter). Tebuconazole was used (i) in the commercial form Horizon 250 EW and (ii) as an analytical grade pure chemical. In the experiment with the commercially available tebuconazole, a significant pH-dependent sorption onto the oxides was observed (decreasing sorption with increasing pH). The highest sorption was found for ferrihydrite due to its high specific surface area, followed by humic acids, birnessite, goethite and illite. No detectable sorption was found for calcite. The sorption of analytical grade tebuconazole on all selected minerals was significantly lower compared to the commercial product. The sorption was the highest for humic acids, followed by ferrihydrite and illite and almost negligible for goethite and birnessite without any pH dependence. Again, no sorption was observed for calcite. The differences in sorption of the commercially available and analytical grade tebuconazole can be attributed to the additives (e.g., solvents) present in the commercial product. This work proved the importance of soil mineralogy and composition of the commercially available pesticides on the behavior of tebuconazole in soils.
本研究旨在探讨丙硫菌唑在常见土壤矿物（钠锰矿、水铁矿、针铁矿、方解石和伊利石）和腐殖酸（代表土壤有机质）上的吸附情况。使用了丙硫菌唑（i）商品形式的 Horizon 250 EW 和（ii）分析纯纯化学物质。在具有商业可用性的丙硫菌唑的实验中，观察到显著的 pH 值依赖性吸附到氧化物上（随着 pH 值的增加，吸附减少）。由于其高比表面积，水铁矿表现出最高的吸附，其次是腐殖酸、钠锰矿、针铁矿和伊利石。对方解石没有检测到可检测的吸附。与商业产品相比，所有选定矿物对分析纯丙硫菌唑的吸附明显较低。腐殖酸的吸附最高，其次是水铁矿和伊利石，针铁矿和钠锰矿几乎可以忽略不计，且没有任何 pH 值依赖性。同样，对方解石没有观察到吸附。商业上可获得的和分析纯丙硫菌唑的吸附差异可归因于商业产品中存在的添加剂（例如溶剂）。这项工作证明了土壤矿物学和商业上可获得的农药组成对丙硫菌唑在土壤中行为的重要性。
