Ofloxacin sorption in soils after long-term tillage: the contribution of organic and mineral compositions.
Ofloxacin sorption in soils after long-term tillage: the contribution of organic and mineral compositions.
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DOI：
10.1016/j.scitotenv.2014.07.130
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发表时间：
2014-11
期刊：
影响因子：
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通讯作者：
Dandan Zhou;Bingfa Chen;Min Wu;N. Liang;Di Zhang;Hao Li;B. Pan
中科院分区：
文献类型：
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作者：
Dandan Zhou;Bingfa Chen;Min Wu;N. Liang;Di Zhang;Hao Li;B. Pan
农业地区强烈的人类活动导致土壤性质发生显著变化，从而改变了土壤与各种污染物的相互作用。这一过程需要纳入污染物行为预测及其风险评估。然而，相关研究却不见踪影。本研究旨在研究耕作后土壤性质和氧氟沙星(OFL)吸附的变化。在不同农业活动的元阳、蒙自和滇池地区采集了土壤样品。虽然元阳和滇池的土壤矿物组成差异很大，但耕作后的土壤矿物组成相似，尤其是水稻土。OFL吸附后土壤pH普遍下降，表明OFL与土壤有机质(SOM)中质子的离子交换对OFL的吸附具有重要作用。然而，没有观察到SOM与OFL吸附之间的正相关关系。相反，当比较来自相同地质位置的土壤时，土壤有机质的增加减少了对L的吸附。一般来说，耕作活动或茂密的植被会大大减少对L的吸附。B层对OFL的吸附大于A层，表明OFL在土柱中的淋溶有限。根据土壤中各组分的吸附量及其百分比计算的总吸附量高于未处理的土壤。这一现象可以从土壤成分之间的相互作用中得到理解，例如在矿物颗粒上覆盖SOM。本研究强调，在评价抗生素的行为和风险时，特别是在人类活动强烈的地区，土壤应该被视为一个动态的环境基质。
Intensive human activities in agricultural areas resulted in significant alteration of soil properties, which consequently change their interactions with various contaminants. This process needs to be incorporated in contaminant behavior prediction and their risk assessment. However, the relevant study is missing. This work was designed to examine the change of soil properties and ofloxacin (OFL) sorption after tillage. Soil samples were collected in Yuanyang, Mengzi, and Dianchi areas with different agricultural activities. Although the mineral compositions of soils from Yuanyang and Dianchi differed greatly, these compositions are similar after tillage, especially for paddy soils. Soil pH decreased generally after OFL sorption, suggesting that ion exchange of OFL with protons in soil organic matter (SOM) was important for OFL sorption. However, a positive relationship between SOM and OFL sorption was not observed. On the contrary, increased SOM decreased OFL sorption when soils from the same geological location were compared. Generally speaking, tillage activities or dense vegetations greatly decreased OFL sorption. The higher OFL sorption in B horizon than A horizon suggested limited leaching of OFL through soil columns. The summed sorption calculated based on the sorption of individual soil components and their percentages in soils was higher than the intact soil. This phenomenon may be understood from the interactions between soil components, such as the coating of SOM on mineral particles. This study emphasizes that soil should be treat as a dynamic environmental matrix when assessing antibiotic behaviors and risks, especially in the area with intense human activities.