Abstract
Online solid-phase extraction was combined with nano-liquid chromatography coupled to high-resolution mass spectrometry (HRMS) for the analysis of micropollutants in environmental samples from small volumes. The method was validated in surface water, Microcystis aeruginosa cell lysate, and spent Microcystis growth medium. For 41 analytes, quantification limits of 0.1–28 ng/L (surface water) and 0.1–32 ng/L (growth medium) were obtained from only 88 μL of sample. In cell lysate, quantification limits ranged from 0.1–143 ng/L or 0.33–476 ng/g dry weight from a sample of 88 μL, or 26 μg dry weight, respectively. The method matches the sensitivity of established online and offline solid-phase extraction–liquid chromatography–mass spectrometry methods but requires only a fraction of the sample used by those techniques, and is among the first applications of nano-LC-MS for environmental analysis. The method was applied to the determination of bioconcentration in Microcystis aeruginosa in a laboratory experiment, and the benefit of coupling to HRMS was demonstrated in a transformation product screening.
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Acknowledgments
This research was supported by the Swiss National Science Foundation, grant number 315230141190. We acknowledge Thorsten Schmidt as the external supervisor of Jonas Mechelke during his Masters thesis.
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Stravs, M.A., Mechelke, J., Ferguson, P.L. et al. Microvolume trace environmental analysis using peak-focusing online solid-phase extraction–nano-liquid chromatography–high-resolution mass spectrometry. Anal Bioanal Chem 408, 1879–1890 (2016). https://doi.org/10.1007/s00216-015-9294-x
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DOI: https://doi.org/10.1007/s00216-015-9294-x