《Table 2 Recovery of MCs at different loading flow rates (n=3)》

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《An Automatic Solid Phase Extraction and Ultra-Performance Liquid Chromatography Tandem Mass Spectrometry for Determination of Seven Microcystins at Ultra-Trace Levels in Surface Water》

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In the initial experiments，we directly injected high concentrations of individual MC standards using Flow Injection Analysis.The detailed information of MS/MS conditions for each MC analyzed are described in Table 1.The protonated molecular ions of MCs were shown in full scan spectra.The relative abundances of doubly charged ions[M+2H]2+ions from MC-RR，MC-YR and MC-LR were stronger than solo charged ions[M+H]+ions.Therefore，we used[M+2H]2+ions of MC-RR（m/z 520.0），MC-YR（m/z 523.4）and MC-LR（m/z 498.4）as precursor ions in this experiment.MC-LA，MC-LY，MC-LW and MC-LF gave clear[M+H]+spectra at m/z 911.5，1 002.5，1 025.5 and 986.5under positive ion mode.These protonated molecules were respectively confirmed as precursor ions.Precursor and product ions are described in Table 1.For the positive ionization mode，the ions（m/z 135.0）can be considered as quantification ions as they are intense and stable product ions.The other product ions are set as qualitative ions for characteristic analysis.