Abstract
A new analytical procedure for strontium in seawater was developed: a capillary-type isotachophoresis which applies the ion exchange method is used. Large amounts of coexisting sodium, magnesium, calcium and potassium interfered with the isotachophoretic measurement of strontium. Therefore, after the seawater sample was passed through the column packed with a sodium cation-exchange resin, calcium was removed with 5.0×10-3M EDTA solution adjusted to pH 6.6 and then strontium was eluted with 5.0×10-3M GEDTA solution adjusted to pH 10.0. Magnesium was eluted little by little with EDTA solution but was not with GEDTA solution. The isotachophoretic determination was performed with an analyzer equipped with a potential gradient detector and a 40-cm- long main column connected to a 10-cm-long precolumn. The leading electrolyte was a mixed solution of 0.01M hydrochloric acid and 0.1% hydroxypropyl methylcellulose, of which the pH was adjusted to 9.0 with tris- (hydroxymethyl)aminomethane. A terminating electrolyte was 0.01M sodium hexanoate. A linear working curve was obtained for artificial seawater samples containing up to 16mg/l of strontium. The proposed method was applied to the determination of strontium in surface seawater samples collected around the coastal area of Osaka Bay in September, 1985. Reproducible values were obtained by the standard addition method.
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