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首页> 外文期刊>Environmental Science and Pollution Research >Influence of selected cyclodextrins in sorption-desorption of chlorpyrifos, chlorothalonil, diazinon, and their main degradation products on different soils
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Influence of selected cyclodextrins in sorption-desorption of chlorpyrifos, chlorothalonil, diazinon, and their main degradation products on different soils

机译：选定环糊精在不同土壤中吸附解吸吸附 - 解吸的影响及其主要降解产物的影响

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摘要

Cyclodextrins (CDs) can improve the apparent solubility and bioavailability of a variety of organic compounds through the formation of inclusion complexes; accordingly, they are suitable for application in innovative remediation technologies of contaminated soils. However, the different interactions in the tertiary system CD/contaminant/soil matrix can affect the bioavailability of the inclusion complex through the possible sorption of CD and CD complex in the soil matrix, as well as with the potential of the sorbed CD to form the complex, concurrent with the desorption processes. This work focuses in changes produced by three different CDs in soil sorption-desorption processes of chlorpyrifos (CPF), diazinon (DZN), and chlorothalonil (CTL), and their major degradation products, 3,5,6-trichloro-2-pyridinol (TCP), 2-isopropyl-6-methyl-4-pyrimidinol, and hydroxy-chlorothalonil (OH-CTL). Cyclodextrins used were beta-cyclodextrin (beta-CD), methyl-beta-cyclodextrin (M beta-CD), and 2-hydroxypropyl-beta-cyclodextrin (HP beta-CD). The studied soils belong to the orders Andisol, Ultisol, and Mollisol with different organic matter contents, mineral composition, and pH. The apparent sorption constants were significantly lower for the three pesticides in the presence of all CDs. The highest displacement of sorption equilibria was produced by the influence of M beta-CD, with the most pronounced effect for CPF, a pesticide strongly sorbed on soils. The same was obtained for TCP and OH-CTL, highlighting the need to assess the risk of generating higher levels of groundwater contamination with polar metabolites if degradation rates are not controlled. The highest desorption efficiency was obtained for the systems CPF-beta-CD, DZN-M beta-CD, and CTL-M beta-CD. Since the degree of adsorption of the complex is relevant to obtain an increase in the bioavailability of the contaminant, a distribution coefficient for the complexed pesticide in all CD-soil-pesticide system was estimated by using the apparent sorption coefficients, the stability constant for each CD-pesticide complex, and the distribution coefficients of free pesticide.
机译：环糊精（CDS）可以通过形成包合物的形成改善各种有机化合物的表观溶解度和生物利用度;因此，它们适用于污染土壤的创新修复技术应用。然而，三级系统Cd /污染物/土基质中的不同相互作用可以通过土壤基质中的CD和Cd复合物的可能吸附，以及吸附的CD的潜力形成含有Cd和Cd复合物的生物利用度复杂，与解吸过程同时。这项工作侧重于三种不同CD在紫杉（CPF），二嗪酮（DZN）和氯洛尼尼（CTL）的土壤吸附解吸过程中产生的变化，以及它们的主要降解产物，3,5,6-三氯-2-吡啶醇（TCP），2-异丙基-6-甲基-4-嘧啶醇，和羟基 - 氯洛尼洛（OH-CTL）。使用的环糊精是β-环糊精（β-CD），甲基β-环糊精（Mβ-CD）和2-羟丙基 - β-环糊精（HPβ-CD）。研究的土壤属于秩序和苏尔，Ultisol和Mollisol，具有不同的有机物质含量，矿物组合物和pH。在所有CD存在下，三种农药的表观吸附常数显着降低。吸附均衡的最高位移是通过Mβ-CD的影响产生的，对CPF的最明显的效果，杀虫剂在土壤上强烈吸收。 TCP和OH-CTL获得相同的是，强调必须评估是否降解速率不能得到控制产生较高水平的与极性代谢物污染地下水的风险。为系统CPF-Beta-CD，DZN-Mβ-CD和CTL-Mβ-CD获得最高解吸效率。由于复杂的吸附程度是相关的，以获得在所述污染物的生物利用度的增加，用于在所有的CD-土壤农药系统络合的农药分布系数是通过使用表观吸附系数，对于每个稳定常数估计CD-农药复合物，以及自由杀虫剂的分布系数。

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