Simple and Rapid HPLC-ICP-MS Method for the Simultaneous Determination of Cr(III) and Cr(VI) by Combining a 2,6-Pyridinedicarboxylic Acid Pre-Complexation Treatment

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  • Ito Akane
    Department of Earth Resources Engineering, Faculty of Engineering, Kyushu University Department of Applied Chemistry for Environment, School of Science and Technology, Kwansei Gakuin University
  • Isamoto Kazuto
    Department of Applied Chemistry for Environment, School of Science and Technology, Kwansei Gakuin University
  • Morishita Yuhei
    Department of Applied Chemistry for Environment, School of Science and Technology, Kwansei Gakuin University
  • Tanimizu Masaharu
    Department of Applied Chemistry for Environment, School of Science and Technology, Kwansei Gakuin University

Description

<p>A simple and rapid analytical method was developed for the simultaneous determination of two chromium species, Cr(III) and Cr(VI), in the environmental waters by high-performance liquid chromatography–inductively coupled plasma-mass spectrometry (HPLC-ICP-MS). This study incorporated a chelating pretreatment with 2,6-pyridinedicarboxylic acid (PDCA) to convert Cr(III) species into a stable Cr(III)-PDCA anion complex, which was then separated from Cr(VI) oxyanion using an anion exchange column. Building on the fundamental analytical approach proposed by Shigeta et al. (doi: 10.2116/analsci.18P012), the mobile phase was optimized to ensure stability for ICP-MS detection, avoiding nonvolatile salts. Chromium species and chloride ions were effectively separated within 6 minutes at a flow rate of 0.6 mL min−1 with the optimized mobile phase, which consisted of 50 mmol L−1 ammonium acetate (pH 6.80) and 2 mmol L−1 PDCA. The detection limits were 0.18 μg L−1 and 0.09 μg L−1 for Cr(III) and Cr(VI), respectively, at m/z 52 under He collision mode.</p>

Journal

  • Mass Spectrometry

    Mass Spectrometry 13 (1), A0161-A0161, 2024-12-18

    The Mass Spectrometry Society of Japan

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