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. 2020 Jun 10;412(20):4941–4952. doi: 10.1007/s00216-020-02722-5

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© The Author(s) 2020

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Fig. 3 — a Apparent recoveries, b sample preparation recoveries, and c matrix effects of the target PM substances spiked at different concentrations (see ESM Table S6) into drinking water (DW) and surface water (SW). Error bars indicate standard deviations (n ≥ 3). (+) or (−) indicates if the analyte was detected in positive or negative ion mode, respectively