Division of Agricultural Chemicals, Indian Agricultural Research Institute, New Delhi, India.
J Environ Sci Health B. 2012;47(3):168-74. doi: 10.1080/03601234.2012.632262.
Sorption of metsulfuron-methyl and sulfosulfuron were studied in five Indian soils using batch sorption method. Freundlich adsorption equation described the sorption of herbicides with K(f) (adsorption coefficient) values ranging between 0.21 and 1.88 (metsulfuron-methyl) and 0.37 and 1.17 (sulfosulfuron). Adsorption isotherms were L-type suggesting that the herbicides sorption decreased with increase in the initial concentration of the herbicide in the solution. The K(f) for metsulfuron-methyl showed good positive correlation with silt content (significant at p = 0.01) and strong negative correlation with the soil pH (significant at p = 0.05) while sorption of sulfosulfuron did not correlate with any of the soil parameter. Desorption of herbicides was concentration dependent and, in general, sulfosulfuron showed higher desorption than the metsulfuron-methyl. The study indicates that these herbicides are poorly sorbed in the Indian soil types and there may be a possibility of their leaching to lower soil profiles.
采用批量吸附法研究了 5 种印度土壤中甲磺胺隆和甲磺胺隆的吸附情况。弗伦德利希吸附方程描述了除草剂的吸附情况，Kf（吸附系数）值在 0.21 到 1.88（甲磺胺隆）和 0.37 到 1.17（甲磺胺隆）之间。吸附等温线为 L 型，表明随着除草剂初始浓度在溶液中的增加，除草剂的吸附减少。甲磺胺隆的 Kf 与粉土含量呈良好的正相关（p=0.01 时显著），与土壤 pH 值呈强负相关（p=0.05 时显著），而甲磺胺隆的吸附与任何土壤参数均无相关性。除草剂的解吸与浓度有关，一般来说，甲磺胺隆的解吸高于甲磺胺隆。研究表明，这些除草剂在印度土壤类型中吸附性差，可能有淋溶到较深土壤层的可能性。
