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

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

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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