title: Determination of acidic pharmaceuticals, antibiotics and ivermectin in river sediment using liquid chromatography-tandem mass spectrometry.
abstract: Analytical methods have been developed for the determination of eight acidic pharmaceuticals and two metabolites, seven antibiotics and the parasiticide ivermectin in a selected river sediment. The sediments were solvent extracted with ultrasonic assistance. A solid phase extraction (SPE) clean-up step was performed thereafter. The acidic compounds clofibric acid, diclofenac, fenoprofen, gemfibrozil, ibuprofen, 2-hydroxy-ibuprofen, indomethacin, ketoprofen, naproxen and the parasiticide ivermectin were measured in the negative mode by LC-APCI-tandem MS, whereas the antibiotics clarithromycin, erythromycin, roxithromycin, sulfadiazine, sulfamethazine, sulfamethoxazole and trimethoprim were detected in the positive mode by LC-ESI-tandem MS. Bezafibrate could not be determined in the sediment using the method developed. The limit of quantification (LOQ) ranged from 0.4 to 8 ng g(-1) for the acidic pharmaceuticals, sulfadiazine and ivermectin and was 20 ng g(-1) for the other antibiotics.
authors.affiliation: Bundesanstalt für Gewässerkunde, P.O. Box 20 02 53, D-56002 Koblenz, Germany.
authors.forename: Dirk
authors.initials: D
authors.lastname: Löffler
authors.forename: Thomas A
authors.initials: TA
authors.lastname: Ternes
mesh_terms: D000143:Acids; D000900:Anti-Bacterial Agents / Q000032:analysis*; D002138:Calibration; D019015:Geologic Sediments / Q000737:chemistry*; D007559:Ivermectin / Q000032:analysis*; D013058:Mass Spectrometry / Q000379:methods*; D004364:Pharmaceutical Preparations / Q000032:analysis*; D012680:Sensitivity and Specificity; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D000143:Acids; D000900:Anti-Bacterial Agents; D004364:Pharmaceutical Preparations; D014874:Water Pollutants, Chemical; D007559:Ivermectin