Environmental Engineering Research Centre, Department of Civil Engineering, The University of Hong Kong, Pokfulam Road, Hong Kong, China.
Chemosphere. 2010 Jan;78(4):430-6. doi: 10.1016/j.chemosphere.2009.10.045. Epub 2009 Nov 13.
Tetracycline is commonly used for human therapy and veterinary purposes as well as agricultural feed additives. In this study, batch experiments were carried out to investigate the sorption behaviour of tetracycline on marine sediments. The sediment samples were collected from Victoria Harbour, Hong Kong. Sorption isotherms of tetracycline on marine sediments can be well described by a Freudlich model. The calculated K(f) varied from 1.12 to 2.34Lg(-1). After H(2)O(2) oxidation for removing the organic carbon from marine sediments, the K(f) values were reduced by more than 80%, but the organic carbon normalized sorption constant averaged 213.1Lg(-1) for the H(2)O(2)-treated sediments, which was higher than 98.3Lg(-1) for the raw marine sediments. The calculated hysteresis coefficient H ranged from 0.79 to 0.90 indicating that there is a hysteresis in desorption. The sorption of tetracycline on marine sediments was found to decrease with an increase of pH and salinity. These research findings are of importance to an assessment of the fate and transport of tetracycline and other similar antibiotics in seawater-sediment systems.
四环素通常被用于人类治疗和兽医用途以及农业饲料添加剂。在这项研究中，进行了批实验以研究四环素在海洋沉积物上的吸附行为。沉积物样品取自中国香港维多利亚港。四环素在海洋沉积物上的吸附等温线可以很好地用弗罗因德利希模型来描述。计算得到的 K(f) 值范围为 1.12 到 2.34Lg(-1)。用过氧化氢（H2O2）氧化去除海洋沉积物中的有机碳后，K(f) 值降低了 80%以上，但经过 H2O2 处理的沉积物的有机碳归一化吸附常数平均为 213.1Lg(-1)，高于原始海洋沉积物的 98.3Lg(-1)。计算得到的滞后系数 H 值范围为 0.79 到 0.90，表明存在解吸滞后现象。研究发现，四环素在海洋沉积物上的吸附随着 pH 值和盐度的增加而降低。这些研究结果对于评估海水中四环素和其他类似抗生素的归宿和输移具有重要意义。
