Fig. 1. Chromatograms of 100 μg L−1 Cr(III)-PDCA and Cr(VI) for m/z 52 at pH 6.22 (light gray), 6.41 (gray), 6.71 (dark gray), and 7.03 (black) under the flow rate of 0.3 mL min−1. PDCA, 2,6-pyridinedicarboxylic acid.
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