生物炭对紫色土中氟喹诺酮吸附-解吸的影响

发布时间：2019-08-02 16:35

【摘要】：以长江中上游典型坡耕地石灰性紫色土为对象,研究生物炭施用(质量比1%和5%)及田间老化(经5~11月份干湿交替)对氟喹诺酮类抗生素(环丙沙星、氧氟沙星和恩诺沙星)吸附-解吸行为的影响.研究表明,3种抗生素在紫色土中的吸附较强,Freundlich方程能较好地拟合其等温吸附-解吸过程,相关系数均达到极显著水平.新鲜施用生物炭不利于环丙沙星和氧氟沙星的吸附,但能促进恩诺沙星的吸附且与生物炭施用量正相关.施炭后土壤中的溶解性有机物明显增加,可能是降低吸附的重要因素,这种影响在老化后明显减弱.3种抗生素在经老化后的1%施炭土中的吸附量均大于对照处理(P0.05),而老化5%施炭土与对照相当.相对于吸附,各处理土壤并未表现出明显的解吸迟滞,施炭促进了环丙沙星和氧氟沙星的解吸,但老化施炭土抑制了恩诺沙星的解吸.
[Abstract]:The effects of biochar application (mass ratio 1% and 5%) and field aging (alternation of dry and wet in May to November) on the adsorption and desorption of fluoroquinolones (ciprofloxacin, ofloxacin and enrofloxacin) were studied in calcareous purple soil of typical sloping farmland in the upper and middle reaches of the Yangtze River. The results showed that the adsorption of the three antibiotics in purple soil was strong, and the Freundlich equation could fit the isotherm adsorption-desorption process well, and the correlation coefficients reached a very significant level. Fresh application of biochar was not conducive to the adsorption of ciprofloxacin and ofloxacin, but it could promote the adsorption of enrofloxacin and was positively correlated with the amount of biochar. The increase of dissolved organic matter in soil after carbon application may be an important factor to decrease the adsorption, and this effect is obviously weakened after aging. The adsorption capacity of the three antibiotics in 1% carbon soil after aging is higher than that in the control treatment (P 0.05), while the aging 5% carbon application soil is similar to the control. Compared with adsorption, there was no obvious desorption lag in each treated soil. Carbon application promoted the desorption of ciprofloxacin and ofloxacin, but the aging carbon application soil inhibited the desorption of enrofloxacin.
【作者单位】：海南大学环境与植物保护学院;中国科学院水利部成都山地灾害与环境研究所;
【基金】：国家自然科学基金资助项目(41471268,41301549) 中西部高校项目资助项目(MWECSP-RT08,ZXBJH-XK004,ZXBJH-XK005)
【分类号】：X131.3

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