Supplementary Information
Figure S1. Structures, chemical formulas, and molecular weights of pesticides analyzed in this study.
Figure S2. Reproducibilities for methomyl (liquid, 1 mg L-1) and methamidophos (5 mg L-1 dried on tomato skin); since the
methamidophos spike was dried, it was converted to 10 ng by multiplying the pesticide concentration (5 mg L-1) by the sampling
volume (2 µL). Ten replicates were obtained for each sample (n = 10). Relative standard deviations (RSDs) are shown for the
respective samples. Averages, SDs, and RSDs were calculated using peak intensities obtained from extracted ion chromatograms
(EICs) for the respective pesticides.
Figure S3. MS/MS spectra from TD-ESI/MS analyses of pesticides in positive MRM mode. Aqueous pesticide standards were
analyzed, while azoxystrobin, boscalid, imazalil, spirodiclofen, tebufenozide, and trifloxystrobin were obtained from sample surfaces.
The red diamonds denote the precursor ion for the respective pesticide, while the bolded numbers indicate major product ions.
Figure S4. MS spectra from TD-ESI/MS analysis of local and imported fruits and vegetables. The crown daisy, orange, bellfruit, and
bell peppers were local, while the grape and grapefruit were imported.
Figure S5. Reduction of residual pesticide on fruit after multiple rinses. Residual azoxystrobin was detected on an imported and
unwashed grape (a). The grape was then rinsed with water for 30 s, 60 s, or 240 s (b-d, respectively).