title: Determination of antibiotic substances in hospital sewage water using solid phase extraction and liquid chromatography/mass spectrometry and group analogue internal standards.
abstract: A method for determination of antibiotics in hospital sewage water has been developed and validated. Analogue internal standards for fluoroquinolones, sulfonamides, trimethoprim, beta-lactams (penicillins and cephalosporins), nitroimidazoles and tetracyclines were successfully used for calibration and shown to generally improve precision compared to external calibration. Matrix components caused ion suppression/enhancement effects during the MS detection for all analytes studied. Two effects were observed: general suppression and short-term variations in the MS response. In the hospital sewage water large temporal variations in the analyte concentration were observed during the course of the sampling period (seven grab samples in 13 h). Analyte concentrations varied within the following ranges (in microg l(-1)): ciprofloxacin, 3.6-101.0; metronidazole, 0.1-90.2; sulfamethoxazole, 0.4-12.8; ofloxacin, 0.2-7.6; trimethoprim, 0.6-7.6; and doxycycline, 0.6-6.7.
authors.affiliation: Department of Chemistry, Environmental Chemistry, Umeå University, SE-907 87 Umeå, Sweden. richard.lindberg@chem.umu.se
authors.forename: Richard
authors.initials: R
authors.lastname: Lindberg
authors.forename: Per-Ake
authors.initials: PA
authors.lastname: Jarnheimer
authors.forename: Björn
authors.initials: B
authors.lastname: Olsen
authors.forename: Magnus
authors.initials: M
authors.lastname: Johansson
authors.forename: Mats
authors.initials: M
authors.lastname: Tysklind
mesh_terms: D000900:Anti-Bacterial Agents / Q000032:analysis* / Q000737:chemistry*; D002853:Chromatography, Liquid; D006761:Hospitals; D013058:Mass Spectrometry; D012722:Sewage / Q000032:analysis*; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D000900:Anti-Bacterial Agents; D012722:Sewage; D014874:Water Pollutants, Chemical