On-Line Determination of Dissolved Silica in Seawater by Ion Exclusion Chromatography in Combination with Inductively Coupled Plasma Mass Spectrometry

• Published in: Analytical chemistry (Washington) Vol. 69; no. 1; pp. 21 - 24
• Main Authors: Hioki, Akiharu, Lam, Joseph W. H., McLaren, James W.
• Format: Journal Article
• Language: English
• Published: Washington, DC American Chemical Society 01.01.1997
• Subjects: Analytical chemistry; Chemistry; Chromatographic methods and physical methods associated with chromatography; Exact sciences and technology; Ions; Oceans; Other chromatographic methods; Scientific imaging; Trace analysis; Water; Chemical analysis; On line; Coupled method; Silicates; Inductive coupling plasma spectrometry; Mass spectrometry; Gel permeation chromatography; Seawater
• ISSN: 0003-2700; 1520-6882
• DOI: 10.1021/ac960588l

A method for the direct determination of dissolved silica in seawater by ion exclusion chromatography in combination with inductively coupled plasma mass spectrometry is described. This method was developed as a second, independent method to complement the usual colorimetric procedure in the determination of a certified concentration of dissolved silica in a planned seawater reference material. Ion exclusion affords a separation of the dissolved silica not only from the major seawater cations but also from potentially interfering anions. The detection limit, conservatively estimated at 2.3 ng g-1 as Si (0.08 μM), is superior to that achievable by direct analysis by inductively coupled plasma atomic emission spectrometry.