[1]蓝志鹏,童鑫,黄宇,等.土壤中磺胺甲口恶唑吸附-解吸反应[J].江苏农业学报,2023,(04):996-1004.[doi:doi:10.3969/j.issn.1000-4440.2023.04.009]
　LAN Zhi-peng,TONG Xin,HUANG Yu,et al.Adsorption-desorption of sulfamethoxazole in soils[J].,2023,(04):996-1004.[doi:doi:10.3969/j.issn.1000-4440.2023.04.009]
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土壤中磺胺甲口恶唑吸附-解吸反应()
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江苏农业学报[ISSN:1006-6977/CN:61-1281/TN]

卷:
期数:
2023年04期
页码:
996-1004
栏目:
耕作栽培·资源环境
出版日期:
2023-08-30

文章信息/Info

Title:
Adsorption-desorption of sulfamethoxazole in soils
作者:
蓝志鹏; 童鑫; 黄宇; 杨杰文
(仲恺农业工程学院资源与环境学院,广东广州510225)
Author(s):
LAN Zhi-peng; TONG Xin; HUANG Yu; YANG Jie-wen
(College of Resources and Environment, Zhongkai University of Agriculture and Engineering, Guangzhou 510225, China)
关键词:
磺胺甲口恶唑; 吸附; 解吸; 土壤
Keywords:
sulfamethoxazole; adsorption; desorption; soil
分类号:
X131.3
DOI:
doi:10.3969/j.issn.1000-4440.2023.04.009
文献标志码:
A
摘要:
研究土壤中磺胺甲口恶唑(SMX)的吸附-解吸反应对了解其降解及迁移过程至关重要。本研究以菜园土和砖红壤2种理化性质、有机质含量差异较大的土壤为试验对象,通过等温吸附和反应动力学试验,研究土壤对SMX的吸附量和吸附反应动力学,探讨pH值、陪伴离子（类型、质量浓度或浓度）以及土壤有机质含量等因素对吸附反应的影响,并在此基础上研究土壤对SMX的解吸特征。结果表明,SMX在这2种土壤中的吸附动力学可用拟二级动力学方程描述,吸附等温线可用Freundlich模型描述,菜园土对SMX的吸附量大于砖红壤,菜园土和砖红壤对SMX的最大吸附量分别为317 mg/kg和93 mg/kg。pH值为3.5～70时,土壤对SMX的吸附率随pH值升高而降低,其原因是pH值越高,土壤表面负电荷数量越多,对SMX的静电斥力越强。Cu2+可促进土壤对SMX的吸附,但苯胺和4-苯胺磺酸等芳香胺类化合物则会降低土壤对SMX的吸附。去除有机质将使土壤对SMX的最大吸附率下降约400%,表明土壤有机质是SMX的重要吸附载体。由于菜园土有机质含量较高,导致菜园土对SMX解吸能力低于砖红壤。本研究结果有助于了解不同土壤中SMX的吸附-解吸反应规律,可以为SMX的污染风险防范提供一定理论支持。
Abstract:
Degradation and migration of sulfamethoxazole (SMX) is highly dependent on its adsorption-desorption reaction in soils. This study aimed to characterize the adsorption-desorption of SMX in vegetable soil and latosol with significant differences in physicochemical properties and organic matter content. Adsorption isotherm and kinetics were evaluated together with the influence of some key factors that included pH, co-existing ions and content of organic matter. Additional emphasis was put on revealing the desorption behavior of SMX. The results showed that the adsorption kinetics of SMX could be fitted by second-order equation, and adsorption isotherm could be described by Freundlich model. The maximum adsorption capacities of SMX in vegetable soil and latosol were 317 mg/kg and 9.3 mg/kg, respectively. Within the examined pH range (3.5-7.0), SMX adsorption in soils was decreased with the increase of pH, which was owing to the enhancement in electrostatic repulsion of soil surfaces towards SMX. Correspondingly, the presence of Cu2+ could promote the adsorption of SMX by decreasing the number of negative charges on soil surfaces, and aromatic amine compounds like aniline and 4-aniline sulfonic acid could exert inhibitive effect through competitive adsorption. Organic matter (OM) was believed to play major role in the adsorption of SMX since SMX adsorption could be decreased by 400% with the removal of OM. Also, the desorption ability of SMX in the vegetable soil was lower than that in the latosol due to its high content of OM. The results of this study are helpful for us to understand the adsorption-desorption behavior of SMX in soils and can provide useful knowledge for controlling its environmental risk.

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备注/Memo

备注/Memo:
收稿日期：2022-09-19 基金项目：国家自然科学基金项目(41671235) 作者简介：蓝志鹏(1997-),男,广东兴宁人,硕士研究生,主要从事抗生素土壤环境化学研究。(Tel)18219160931；(E-mail)2232240840@qq.com 通讯作者：杨杰文,(E-mail)jiewenyang@zhku.edu.cn
更新日期/Last Update: 2023-09-12