双氟沙星和林可霉素在典型土壤上的吸附行为研究

发布时间：2018-12-14 01:20

【摘要】：我国东北、华北、华南等地区经济发展迅速,人口众多,抗生素滥用严重,由此带来的环境风险也越来越严重。本文选择三种典型土壤辽河平原标准土(gss-11)、华北平原标准土(gss-13)、珠江三角洲标准土(gss-16)作为吸附介质,研究氟喹诺酮类抗生素双氟沙星和林可酰胺类抗生素林可霉素的吸附行为,以期为这些地区抗生素风险评价及污染治理提供理论依据,主要取得的成果如下:1)双氟沙星和林可霉素在辽河平原标准土、华北平原标准土、珠江三角洲标准土上的吸附均符合Langmuir吸附方程。双氟沙星的吸附是表面化学吸附和静电作用,林可霉素的吸附机理主要是物理吸附和氢键作用,且双氟沙星吸附能力大于林可霉素。2)p H对双氟沙星和林可霉素的吸附与解吸起重要作用。整体趋势是溶液p H接近p Ka时吸附量最大,然后随着p H的增大或减小吸附量随之减小。3)双氟沙星在三种土壤上的解吸存在明显滞后现象,迟滞因子R较大,在环境中不容易迁移;林可霉素在三种土壤上容易解吸,且当p H降低时解吸百分比增加,迟滞因子R约等于1,在环境中容易迁移,易对地下水造成污染。4)林可霉素对双氟沙星在华北平原标准土上的吸附有促进作用,同时也抑制了双氟沙星的解吸作用;双氟沙星由于占据了林可霉素的羟基在土壤表面的吸附位点从而抑制林可霉素的吸附作用。
[Abstract]:Northeast China, South China and other regions have rapid economic development, large population, serious abuse of antibiotics, resulting in more and more serious environmental risks. In this paper, three typical soils, the standard soil of Liaohe Plain (gss-11), the Standard soil of North China Plain (gss-13) and the Standard soil of Pearl River Delta (gss-16) are selected as adsorption media. To study the adsorption behavior of bisfluracin and lincomycin, a fluoroquinolone antibiotic, in order to provide theoretical basis for antibiotic risk assessment and pollution control in these areas. The main results are as follows: 1) the adsorption of bisfluracin and lincomycin on the standard soil of Liaohe plain, the standard soil of North China plain and the standard soil of Pearl River Delta accords with the Langmuir adsorption equation. The adsorption mechanism of lincomycin is mainly physical adsorption and hydrogen bonding. The adsorption ability of bisfluracin was higher than that of lincomycin. 2) p H played an important role in the adsorption and desorption of bisfluracin and lincomycin. The overall trend was that the adsorption capacity of solution pH was the largest when pH was close to p Ka, and then decreased with the increase or decrease of pH. 3) the desorption of bisfluracin in three soils was obviously delayed, and the hysteresis factor R was larger. It is not easy to migrate in the environment; Lincomycin was easily desorbed in three soils, and the desorption percentage increased when pH decreased, and the hysteresis factor R was about 1, which was easy to migrate in the environment. It is easy to pollute groundwater. 4) lincomycin can promote the adsorption of bisfluracin on the standard soil of North China Plain, and also inhibit the desorption of bisfluracin. Bisfluracin inhibits lincomycin adsorption by occupying the adsorption sites of lincomycin hydroxyl groups on soil surface.
【学位授予单位】：中国地质大学(北京)
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X53

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