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Sorption of albendazole in sediments and soils: Isotherms and kinetics
Chemosphere ( IF 8.1 ) Pub Date : 2017-11-09 , DOI: 10.1016/j.chemosphere.2017.11.025
Dragana Mutavdžić Pavlović , Antonija Glavač , Mihaela Gluhak , Mislav Runje

Albendazole is a broad-spectrum anthelmintic drug effective against gastrointestinal parasites in humans and animals. Despite the fact that it has been detected in environment (water, sediment and soil), there is no information on its fate in the environment. So, in order to understand the sorption process of albendazole in environment, the sorption mechanism and kinetic properties were investigated through sorption equilibrium and sorption rate experiments. For that purpose, batch sorption of albendazole on five sediment samples and five soil samples from Croatia's region with different physico-chemical properties was investigated. Except physico-chemical properties of used environmental solid samples, the effects of various parameters such as contact time, initial concentration, ionic strength and pH on the albendazole sorption were studied. The Kd parameter from linear sorption model was determined by linear regression analysis, while the Freundlich and Langmuir sorption models were applied to describe the equilibrium isotherms. The estimated Kd values varied from 29.438 to 104.43 mLgg−1 at 0.01 M CaCl2 and for natural pH value of albendazole solution (pH 6.6). Experimental data showed that the best agreement was obtained with the linear model (R2 > 0.99), while the rate of albendazole sorption is the best described with the kinetic model of pseudo-second-order. Obtained results point to a medium or even strong sorption of albendazole for soil or sediment particles, which is particularly dependent on the proportion of organic matter, pH, copper and zinc in them.



中文翻译:

阿苯达唑在沉积物和土壤中的吸附:等温线和动力学

阿苯达唑是一种广谱驱虫药,对人和动物的胃肠道寄生虫有效。尽管已经在环境(水,沉积物和土壤)中检测到了它,但没有关于其在环境中的命运的信息。因此,为了了解阿苯达唑在环境中的吸附过程,通过吸附平衡和吸附速率实验研究了吸附机理和动力学性质。为此,研究了阿苯达唑在克罗地亚地区五种具有不同理化性质的沉积物样品和五种土壤样品上的批次吸附。除了使用的环境固体样品的物理化学性质外,还研究了接触时间,初始浓度,离子强度和pH等各种参数对阿苯达唑吸附的影响。通过线性回归分析确定线性吸附模型的K d参数,同时使用Freundlich和Langmuir吸附模型描述平衡等温线。对于阿苯达唑溶液的自然pH值(pH 6.6),在0.01 M CaCl 2下,估计的K d值从29.438到104.43 mLgg -1。实验数据表明,使用线性模型(R 2 > 0.99),而用假二阶动力学模型可以最好地描述阿苯达唑的吸附速率。获得的结果表明阿苯达唑对土壤或沉积物颗粒的吸附能力中等或什至很高,这尤其取决于其中的有机物,pH,铜和锌的比例。

更新日期:2017-11-10
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