engleski

Multi-class determination of pharmaceuticals in waste waters by solid phase extraction and liquid chromatography tandem mass spectrometry with matrix effect study

In this work a multi-class analytical method for determination of 22 frequently used pharmaceuticals was developed and validated. Analytes were from different classes for example macrolides, fluoroquinolones, tetracyclines, sulfonamides, anthelmintics, anesthetics and others. Method was intended for analysis of aqueous samples so the sample preparation was done using solid phase extraction (SPE). Different sorbents (C8, C18, polymeric and ion exchange sorbents) combining different eluents (methanol, ethanol, acetonitrile, acetone, ethyl acetate) were investigated during development of sample preparation step. Samples were analyzed using HPLC-MS/MS and therefore chromatographic and mass spectrometer conditions were investigated. Optimal extraction efficiencies for most of the investigated analytes were obtained with Oasis HLB polymeric sorbents with acetonitrile as eluent. A study of matrix effect was carried out for waste water treatment plant (WWTP) influent and effluent. The method was validated for linearity, detection limits and quantification limits, repeatability and reproducibility. Method detection limits were in the range of 2.0 – 204.0 ng L-1 for WWTP influent except for sulfaguanidine and dexamethazone. Also method detection limits for WWTP effluent were from 1.0 – 115.4 ng L-1. Method was successfully applied for analysis of real waste water samples from municipal waste water treatment plant. In the influent pharmaceuticals from all investigated groups were present and the concentrations were from 50.0 – 4914.3 ng L-1 for influent and 26.9 – 1699.2 ng L-1 for effluent. It was also reported that some pharmaceuticals showed higher concentrations in the waste water effluent than in the influent.

emerging contaminants ; SPE ; liquid chromatography ; mass spectrometry ; matrix effect ; method development ; environment

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