Adsorption kinetics of the herbicide safeners, benoxacor and furilazole, to activated carbon and agricultural soils
Adsorption kinetics of the herbicide safeners, benoxacor and furilazole, to activated carbon and agricultural soils
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DOI：
10.1016/j.jes.2019.09.022
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发表时间：
2020-03-01
影响因子：
6.9
通讯作者：
Weidhaas, Jennifer
中科院分区：
文献类型：
--
作者：
Acharya, Saraswati Poudel;Johnson, Jacob;Weidhaas, Jennifer
氯乙酰胺除草剂，即乙草胺和甲草胺，是玉米和大豆田常用的除草剂。二氯乙酰胺安全剂，即苯恶唑和呋喃唑，通常用于含有氯乙酰胺除草剂的配方中。关于氯乙酰胺除草剂的吸附有大量的报道，但关于共同应用的安全剂的吸附潜力的信息很少。本文报道了所选除草剂安全剂对颗粒活性炭（GAC）和农业土壤的吸附和解吸特性。此外，还进行了土壤柱研究，以了解除草剂Dual II Magnum的淋滤行为。安全剂对3种农用土壤和1种GAC的平衡吸附实验表明，吸附最符合Freundlich等温线。三种农业土壤对苯恶唑和呋喃唑吸附的Freundlich吸附常数Kf分别为0.1 ~ 0.27和0.1 ~ 0.13 (mg/g) x (mg/L)（布尔与）（1/n）。苯恶唑和呋喃唑对GAC的K-f分别为6.4和3.4 (mg/g) x (mg/L)（布尔与）（1/n），说明苯恶唑对GAC的吸附优于呋喃唑对GAC的吸附。两种安全剂对土壤的吸附是可逆的，几乎40%-90%的安全剂从三种土壤中解吸。这些结果在四项重复的土壤柱研究中得到了验证，在这些研究中，s -甲草胺的浸出效果与源自除草剂配方的安全剂苯恶草胺相似。土壤质地对s -甲草胺和苯恶草胺的浸出有影响。综上所述，这些结果表明，安全剂会像除草剂中的有效成分一样，通过环境移动到地表水中，但可能在通过GAC处理饮用水的过程中被去除。(c) 2019中国科学院生态环境科学研究中心。Elsevier B.V.出版
Chloroacetamide herbicides, namely acetochlor and metolachlor, are common herbicides used on corn and soybean fields. Dichloroacetamide safeners, namely benoxacor and furilazole, are commonly used in formulations containing chloroacetamide herbicides. Extensive reports on adsorption of chloroacetamide herbicides are available, yet little information exists regarding adsorption potential of co-applied safeners. Herein, the adsorption and desorption characteristics of selected herbicide safeners to granular activated carbon (GAC) and in agricultural soils are reported. Further, soil column studies were performed to understand the leaching behaviour of the herbicide Dual II Magnum. Equilibrium sorption experiments of safeners to three agricultural soils and one GAC showed that adsorption was best fitted by the Freundlich isotherm. The Freundlich adsorption constant, Kf, for benoxacor and furilazole sorption onto three agricultural soils ranged from 0.1 to 0.27 and 0.1 to 0.13 (mg/g) x (mg/L)(boolean AND)(1/n), respectively. The K-f for benoxacor and furilazole to GAC was 6.4 and 3.4 (mg/g) x (mg/L)(boolean AND)(1/n), respectively, suggesting more favorable sorption of benoxacor to GAC than furilazole to GAC. The sorption to soils was reversible as almost 40%-90% of both safeners was desorbed from three soils. These results were validated in four replicated soil column studies, where S-metolachlor was shown to leach similarly to the safener benoxacor, originating from the herbicide formulation. The leaching of S-metolachlor and benoxacor was influenced by soil texture. Cumulatively, these results show that safeners will move through the environment to surface waters similarly to the active ingredients in herbicides, but may be removed during drinking water treatment via GAC. (c) 2019 The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V.