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Determination of ultra-trace level of 232Th in seawater by ICP-SFMS after matrix separation and preconcentration

Wysocka, Irena ; Vassileva, Emilia

Analytica Chimica Acta, 13 February 2018, Vol.1000, pp.144-154 [Peer Reviewed Journal]

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  • Title:
    Determination of ultra-trace level of 232Th in seawater by ICP-SFMS after matrix separation and preconcentration
  • Author: Wysocka, Irena ; Vassileva, Emilia
  • Subjects: 232th ; Seawater ; Isotope Dilution ; Icp-Sfms ; Seafast-Pico System ; Method Validation ; 232th ; Seawater ; Isotope Dilution ; Icp-Sfms ; Seafast-Pico System ; Method Validation ; Chemistry
  • Is Part Of: Analytica Chimica Acta, 13 February 2018, Vol.1000, pp.144-154
  • Description: This article describes the development and validation of an analytical procedure for the matrix separation, preconcentration and determination of sub-ng kg−1 levels 232Th in a small volume (20 mL) of seawater samples. The matrix separation and Th preconcentration was carried out using a commercially available ion-chelation system seaFAST-pico. The acidified to pH  2 seawater samples were mixed on-line with the ammonium acetate buffer (pH of 6.0 ± 0.2) before loading on the column containing resin with iminodiacetic and ethylenediaminetriacetic functional groups. At this pH, 232Th was quantitatively retained on the resin, demonstrating a good affinity (selectivity) for Th in seawater matrix. The element retained on the resin was eluted using only 0.2 mL of 1.8 M HNO3 enabling to achieve high preconcentration factor. The pretreatment procedure, with two sample loading cycles (each one 10 mL), was accomplished in about 25 min. Determining 232Th mass fraction in seawater samples...
  • Language: English
  • Identifier: ISSN: 0003-2670 ; E-ISSN: 1873-4324 ; DOI: 10.1016/j.aca.2017.09.018

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