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首页> 外文期刊>Journal of environmental science and health >Study of sorption of two sulfonylurea type of herbicides and their additives on soils and soil components
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Study of sorption of two sulfonylurea type of herbicides and their additives on soils and soil components

机译：两种磺酰脲类除草剂及其添加剂在土壤和土壤成分上的吸附研究

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摘要

The sorption of two sulfonylurea type herbicides (chlorsulfuron: (1-(2-chlorophenylsulfonyl)-3-(4-methoxy-6-methyl-1,3,5-triazin-2-yl)urea; tribenuron methyl: (methyl-2-[N-(4-methoxy-6-methyl-1,3,5-triazin-2-yl)-3-(methyl-ureido)-sulfonyl]-benzoate) was studied on sand and chernozem soil adsorbents. Experimental results for solutions prepared from the pure ingredients were compared to those prepared from the appropriate formulated commercial products. At small concentrations, the extent of adsorption of the active ingredient was higher than from the formulation containing solutions. Environmental fate and effects of the forming agents are less investigated because they rarely have concentration limits recommended by authorities. In addition to the adsorption of active ingredients, therefore, the sorption behavior of a widely used additive Supragil WP (sodium diisopropyl naphthalene sulphonate) was also studied. This dispersant is an anionic forming agent applied in a lot of pesticide formulations. Using three different soils (sand, brown forest, chernozem) as adsorbents two-step isotherms were obtained. The role of the soil organic matter (OM) was significant in the adsorption mechanism because the adsorbed amounts of the dispersant correlated with the specific surface area as well as with the total organic carbon (TOC) content of the soils. The sorption behavior indicates the operation of hydrophobic interaction mechanism between the soil OM and the dispersant. These results are supported by our further sorption experiments on clays, too. Zeta potential measurements seem to be promising for the interpretation of multi-step isotherms. The application of this technique proved that higher concentrations of the anionic forming agent assisted the peptization of soil organic matter (SOM) resulting in stable colloidal solution dominated by negative charges. Since the pesticides investigated are also anionic at the studied pH (7 and 8.3) the dissolved organics lead to the enhancement of the mobility of both the sulfonylureas and dispersant.
机译：两种磺酰脲类除草剂的吸附（氯磺隆：（1-（2-氯苯基磺酰基）-3-（4-甲氧基-6-甲基-1,3,5-三嗪-2-基）脲;三苯磺隆甲基：（甲基-研究了2- [N-（4-甲氧基-6-甲基-1,3,5-三嗪-2-基）-3-（甲基-脲基）-磺酰基]-苯甲酸酯在沙土和黑钙土上的吸附剂。将由纯成分制得的溶液的结果与由适当配方的市售产品制得的溶液的结果进行了比较，在低浓度下，活性成分的吸附程度高于含溶液的制剂，对环境的影响和形成剂的影响由于它们很少受到当局推荐的浓度限制，因此研究较少，因此，除了吸附活性成分外，还研究了广泛使用的添加剂Supragil WP（二异丙基萘磺酸钠）的吸附行为，该分散剂是阴离子形成剂。在很多农药中应用规定。使用三种不同的土壤（沙土，棕林，黑钙土）作为吸附剂，获得了两步等温线。土壤有机物（OM）的作用在吸附机理中很重要，因为分散剂的吸附量与土壤的比表面积以及总有机碳（TOC）含量相关。吸附行为表明了土壤OM和分散剂之间的疏水相互作用机理的运行。这些结果也得到我们在粘土上进一步吸附实验的支持。 Zeta电势测量似乎有望用于解释多步等温线。该技术的应用证明，较高浓度的阴离子形成剂有助于土壤有机质（SOM）的胶溶，从而产生稳定的胶体溶液，该溶液以负电荷为主。由于所研究的农药在所研究的pH值（7和8.3）下均为阴离子型，因此溶解的有机物可提高磺酰脲和分散剂的迁移率。

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