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EICs of other water-soluble organosulfates with their proposed structures: (a) m/z 199 corresponding to C4H7O7S−, (b) m/z 211 corresponding to C5H7O7S−, and (c) m/z 213 corresponding to C5H9O7S− observed in PM2.5 samples collected from (1) Look Rock during 2013 SOAS campaign; (2) Manaus in Nov. 2016. No significant peaks were observed beyond the shown periods of retention time.
