Analytical Sciences

Determination of Organotin Compounds in Fish by Gas Chromatography-Atomic Absorption Spectrometry Using 8-Quinolinol as a Complexing Agent

Hisatake NARASAKI,  Hong-Bing HOU, and Yuichi MORIMURA

Department of Chemistry, Faculty of Science, Saitama University, Shimo-Okubo, Urawa 338-8570, Japan

Recoveries of tributyltin and triphenyltin chlorides spiked in fish were improved by addition of 8-quinolinol. Fish samples spiked with tributyltin and triphenyltin chlorides were homogenized with hydrochloric acid. The chlorides were extracted twice into hexane. After centrifugation, a 2-propanol solution of the chlorides were adsorbed to Bondesil SCX and eluted with a methanol solution of 1 M hydrochloric acid. The chlorides were hydradized with an ethanol solution of sodium tetrahydroborate(III) and injected into a gas chromatography{Žßtomic absorption spectrometer. Tributyltin and triphenyltin chlorides in an NIES Certified Reference Material (sea bass) were determined by the proposed procedure. The analytical results were close to the certified and reference values, respectively. Low recoveries were obtained when monobutyltin and dibutyltin chlorides were spiked with and without 8-quinolinol. Tributyltin and triphenyltin chlorides are supposed to form ion-associates with 8-quinolinol in an aqueous solution of hydrochloric acid. The detection limits (three times the signal-to-noise ratio) of tributyltin and triphenyltin chlorides were 105 and 165 pg, respectively.

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