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<p>Laser-induced fluorescence spectroscopy was used to determine the concentration of cobalt ions in aqueous solution, in which CH-90 resin was used to chelate the ions to transform the liquid samples into solid ones. The experimental results showed that the fluorescence emission of the ions was significantly enhanced after excited by a low-power semiconductor laser at the wavelength of 447&#xa0;nm. The limit of detection of 1.0&#xa0;ng/L was achieved, which was 10,000 times lower than the permissible Co(Ⅱ) content of 0.01&#xa0;mg/L in drinking water. The fluorescence intensity was proportional to the concentration of cobalt ions with a linear correlation coefficient of R<sup>2</sup> = 0. 998. The method greatly improved the sensitivity of detection for cobalt element in aqueous solutions.</p>

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Highly sensitive detection of cobalt ions in aqueous solutions by laser induced fluorescence spectroscopy

  • 期刊论文

  • 发表日期：

    2025年10月14日

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  • Lanxin Shi,
  • Jinan Xia,
  • Dongqing Qiao,
  • Junjie Pan,
  • Huimiao Cheng,
  • Zixuan Wang

摘要

Laser-induced fluorescence spectroscopy was used to determine the concentration of cobalt ions in aqueous solution, in which CH-90 resin was used to chelate the ions to transform the liquid samples into solid ones. The experimental results showed that the fluorescence emission of the ions was significantly enhanced after excited by a low-power semiconductor laser at the wavelength of 447 nm. The limit of detection of 1.0 ng/L was achieved, which was 10,000 times lower than the permissible Co(Ⅱ) content of 0.01 mg/L in drinking water. The fluorescence intensity was proportional to the concentration of cobalt ions with a linear correlation coefficient of R2 = 0. 998. The method greatly improved the sensitivity of detection for cobalt element in aqueous solutions.