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Factors affecting the fate of ciprofloxacin in aquatic field systems

Cardoza, L.A. and Knapp, C.W. and Larive, C.K. and Belden, J.B. and Lydy, M. and Graham, D.W. (2005) Factors affecting the fate of ciprofloxacin in aquatic field systems. Water, Air, and Soil Pollution, 161 (1-4). pp. 383-398. ISSN 1573-2932

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Abstract

Ciprofloxacin (cipro) is a broad-spectrum antibiotic used in human and veterinary medicine that is readily transported into the environment via domestic wastewaters and through direct runoff. Although factors governing cipro fate are becoming understood, an integrated evaluation of disappearance mechanisms in aquatic systems has not been performed. Here we examined cipro disappearance rate in surface waters using both laboratory and field systems under different light, and dissolved (DOC) and particulate organic carbon (POC) conditions to determine when photodegradation versus adsorption dominates cipro fate. Initial laboratory experiments showed that cipro rapidly photodegraded (t(1/2) ∼ 1.5 h) with numerous photodegradation products being noted when POC levels were low. However, even moderate water column POC levels resulted in reduced photodegradation ( no breakdown products detected) and soluble cipro disappearance rates were accelerated. C-14-ciprofloxacin studies confirmed significant adsorption onto aquatic POC (KOC values of 13,900 to 20,500 L/kg at neutral pH). In contrast, a follow-up mesocosm-scale field study using low POC water showed that photodegradation could also dominate cipro fate. In conclusion, both adsorption and photodegradation strongly influence cipro fate in aquatic systems, although the dominant mechanism appears to depend upon the ambient POC level.

Item type: Article
ID code: 16363
Keywords: aquatic systems, ciprofloxacin, field mesocosm, fluoroquinolone antibiotics, particulate organic carbon, photodegradation, chemistry, Environmental Sciences, Water Science and Technology, Environmental Chemistry, Pollution, Ecological Modelling, Environmental Engineering
Subjects: Geography. Anthropology. Recreation > Environmental Sciences
Department: Faculty of Engineering > Civil and Environmental Engineering
Related URLs:
Depositing user: Dr Charles W Knapp
Date Deposited: 11 Mar 2010 11:56
Last modified: 05 Sep 2014 01:25
URI: http://strathprints.strath.ac.uk/id/eprint/16363

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