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Simultaneous determination of silicic acid, Ca, Mg and Al in mineral water and composite tablets by ion chromatography

  • Q. Xu
  • , C. Xu
  • , W. Zhang
  • , Y. P. Wang
  • , L. T. Jin*
  • , H. Haraguchi
  • , A. Itoh
  • , K. Tanaka
  • *Corresponding author for this work
  • East China Normal University
  • Nagoya University
  • National Institute of Advanced Industrial Science and Technology

Research output: Contribution to journalArticlepeer-review

Abstract

A simple, selective and sensitive ion-chromatography method was investigated for simultaneously determining silicic acid, Ca2+, Mg2+, Al3+ and anions (Cl- and NO3-)in real samples. It involved a single-column ion-chromatograph with sodium hydroxide-methanol-water eluent and conductometric detection. Cations were converted to complex anions by adding EDTA to the sample solution. A set of well-defined peaks of silicic acid, Ca2+, Mg2+, Al3+, Cl- and NO3- were obtained. Detection limits using 3.3σ (σ = standard deviation of blank solution) were 1.25 × 10-6 M for H3SiO4-, 1.32 × 10-6 M for Ca2+, 1.28 × 10-6 M for Mg2+, 1.33 × 10- 6 M for Al3+, 1.31 × 10-6 M for Cl- and 1.24 × 10-6 M for NO3-. The method was successfully applied to analysis of mineral water and composite tablets.

Original languageEnglish
Pages (from-to)81-84
Number of pages4
JournalChromatographia
Volume53
Issue number1-2
DOIs
StatePublished - 2001

Keywords

  • Conductometric detection
  • Ion chromatography
  • Silicic acid, calcium, magnesium and aluminum
  • Simultaneous determination

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