The occurrence of antibiotics including chloramphenciol (CAP), oxytetracycline (OTC) and tetracycline (TC) was studied in municipal sewage, river water and sediment. Temporal and spatial variations of antibiotic concentrations in municipal sewage, river water and sediment were evaluated. In municipal sewage, CAP, OTC and TC concentrations were in the range of 5.8-47.4, 0.16-5.7 and 0.7-65.2 g L~(-1), respectively, and showed a temporal variation with high antibiotic concentrations appearing in the cold season. Untreated municipal sewage can seriously influence both river water and sediment. Generally, high antibiotic concentrations in river water appeared in winter owing to the low flow condition as well as the high antibiotic concentration in the sewage. However, high CAP and OTC concentrations in sediment were observed in summer most likely because runoff in high flow season can carry wastes from some origins (e.g. livestock farms in the countryside) into the river. The partitioning of antibiotics in river water and sediment suggests a lower sorption of TCs to the sediment compared to previous studies, which is believed to be caused by the high Ca~(2+) and Mg~(2+) concentrations, ionic strength and pH of the river water in the carbonate area.
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机译：研究了城市污水，河水和沉积物中抗生素的存在，包括氯霉素（CAP），土霉素（OTC）和四环素（TC）。评价了城市污水，河水和沉积物中抗生素浓度的时空变化。在城市污水中，CAP，OTC和TC的浓度分别在5.8-47.4、0.16-5.7和0.7-65.2 g L〜（-1）的范围内，并表现出随时间变化，在寒冷季节出现高抗生素浓度。未经处理的城市污水会严重影响河水和沉积物。通常，由于流量低以及污水中抗生素浓度高，冬季河水中抗生素浓度高。但是，最有可能在夏季观察到沉积物中的CAP和OTC浓度较高，因为高流量季节的径流会将某些来源（例如农村的牲畜养殖场）的废物运入河中。与以前的研究相比，抗生素在河水和沉积物中的分配表明TCs对沉积物的吸附较低，这被认为是由于高的Ca〜（2+）和Mg〜（2+）浓度，离子强度和碳酸盐地区河水的pH值。
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