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Reduction of various microcystin (MC) congeners in acidified and non-acidified solvents after increasing steps of pipetting using polypropylene pipette tips. MC were spiked into water (A); acidified water (B); 80% methanol (C); or acidified 80% methanol (D); and subjected to increasing numbers of pipetting steps. Acidification was achieved using 0.1% formic acid. Significance levels are not inserted in the graph for clarity reasons, but are available in Table S1.
