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腐殖质土壤中有机质不同组分对土霉素的吸附特性：来自内部结构和组成的见解。

Adsorption Characteristics of Oxytetracycline by Different Fractions of the Organic Matter from Humus Soil: Insight from Internal Structure and Composition.

机构信息

Key Laboratory of Subsurface Hydrology and Ecological Effects in Arid Region (Chang'an University)，Ministry of Education, School of Environmental Science and Engineering, Chang'an University, Xi'an 710054, China.

出版信息

Int J Environ Res Public Health. 2020 Feb 1;17(3):914. doi: 10.3390/ijerph17030914.

DOI:10.3390/ijerph17030914
PMID:32024210
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7037445/
Abstract

For minimizing the transport of antibiotics to groundwater, the migration of antibiotics in soils should be investigated. Soil organic matter can affect the migration of antibiotics. To date, the influence of aromatics and aliphatic content of organic matter on the adsorption of antibiotics has been controversial. To better understand the reaction mechanism of soil organic matter with antibiotics, this study investigated the adsorption of oxytetracycline (OTC) by humus soils (HOS) and their fractions. HOS were sequentially fractionated into four organic fractions, including the removal of dissolved organic matter (HRDOM), removal of minerals (HRM), removal of free fat (HRLF), and nonhydrolyzable organic carbon (HNHC). Moreover, batch experiments revealed that adsorption capacity was ordered by HNHC > HOS > HRDOM > HRLF > HRM. SEM images and N adsorption/desorption isotherms indicate that adsorption capacity is independent of the external structure. However, adsorption capacity is related to the internal structure and composition. Combination analysis with elemental composition and infrared spectroscopy showed that the adsorption capacity of HRM, HRLF, and HNHC had a good positive correlation with aromaticity, but a negative correlation with polarity and hydrophilicity. Additionally, the rule of binding affinity between OTC and functional groups with different properties was summarized as aromatic > polarity > hydrophilic.

摘要

为了最大限度地减少抗生素向地下水的迁移，应该研究抗生素在土壤中的迁移。土壤有机质会影响抗生素的迁移。迄今为止，关于有机质的芳香族和脂肪族含量对抗生素吸附的影响一直存在争议。为了更好地理解土壤有机质与抗生素的反应机制，本研究考察了腐殖质土壤（HOS）及其各组分对土霉素（OTC）的吸附作用。HOS 被顺序地分成四个有机组分，包括去除溶解有机质（HRDOM）、去除矿物质（HRM）、去除游离脂肪（HRLF）和不可水解有机碳（HNHC）。此外，批实验表明，吸附能力的顺序为 HNHC>HOS>HRDOM>HRLF>HRM。SEM 图像和 N 吸附/解吸等温线表明，吸附能力与外部结构无关，而与内部结构和组成有关。结合元素组成和红外光谱分析表明，HRM、HRLF 和 HNHC 的吸附能力与芳香性呈良好的正相关，但与极性和亲水性呈负相关。此外，总结了 OTC 与不同性质官能团之间结合亲和力的规律为芳香性>极性>亲水性。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1d96/7037445/06321cf1a3c0/ijerph-17-00914-g012.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1d96/7037445/6506ee49c196/ijerph-17-00914-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1d96/7037445/4f01746b798a/ijerph-17-00914-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1d96/7037445/fc217c91bdfa/ijerph-17-00914-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1d96/7037445/cfb0b4294bb0/ijerph-17-00914-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1d96/7037445/9e964e900bf6/ijerph-17-00914-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1d96/7037445/32220a6beed4/ijerph-17-00914-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1d96/7037445/9052201c2b94/ijerph-17-00914-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1d96/7037445/0f8e36ba89fa/ijerph-17-00914-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1d96/7037445/d51b9c2f6a8f/ijerph-17-00914-g009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1d96/7037445/cad804e16a33/ijerph-17-00914-g010.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1d96/7037445/87efe5db2cbf/ijerph-17-00914-g011.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1d96/7037445/06321cf1a3c0/ijerph-17-00914-g012.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1d96/7037445/6506ee49c196/ijerph-17-00914-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1d96/7037445/4f01746b798a/ijerph-17-00914-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1d96/7037445/fc217c91bdfa/ijerph-17-00914-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1d96/7037445/cfb0b4294bb0/ijerph-17-00914-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1d96/7037445/9e964e900bf6/ijerph-17-00914-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1d96/7037445/32220a6beed4/ijerph-17-00914-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1d96/7037445/9052201c2b94/ijerph-17-00914-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1d96/7037445/0f8e36ba89fa/ijerph-17-00914-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1d96/7037445/d51b9c2f6a8f/ijerph-17-00914-g009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1d96/7037445/cad804e16a33/ijerph-17-00914-g010.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1d96/7037445/87efe5db2cbf/ijerph-17-00914-g011.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1d96/7037445/06321cf1a3c0/ijerph-17-00914-g012.jpg

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