Partitionings of Major-to-Ultratrace Elements in Bittern as Determined by ICP-AES and ICP-MS with Aid of Chelating Resin Preconcentration

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  • Ji Shan
    Department of Applied Chemistry, Graduate School of Engineering, Nagoya University
  • Zhu Yanbei
    Department of Applied Chemistry, Graduate School of Engineering, Nagoya University
  • Yabutani Tomoki
    Department of Chemical Science and Technology, Faculty of Engineering, The University of Tokushima
  • Itoh Akihide
    College of Education, University of the Ryukyus
  • Haraguchi Hiroki
    Department of Applied Chemistry, Graduate School of Engineering, Nagoya University

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Abstract

The concentrations of major-to-ultratrace elements in bittern, which was obtained after seawater concentration in the salt preparation process, were investigated by ICP-AES (inductively coupled plasma atomic emission spectrometry) and ICP-MS (inductively coupled plasma mass spectrometry) with and without the aid of chelating resin preconcentration. As a result, 34 elements in bittern could be determined in the concentration range from 107 to 10−3 ng mL−1 with good RSDs (less than 5%) for most analyte elements. Based on the experimental results, the concentrations of the elements in bittern were compared with those in seawater. Furthermore, the distribution factors of major-to-ultratrace elements in bittern were estimated to elucidate the partitionings of those elements among the calcium precipitate, the salt and the bittern from coastal seawater. The results suggest that the concentrations of the elements in bittern significantly depended on their chemical forms in seawater. For example, K and Mg in ionic form, V, Mo, W, and U in oxoanion form, and Cu and Zn in complex form with organic molecules in seawater, were much more partitioned in bittern than in salt.

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