Leucoquinizarin as an analytical spectrophotometric and fluorimetric reagent. Part 2. Determination of beryllium

ANALYSTANALYST Pub Date: DOI: 10.1039/AN9861101293

Abstract

The reaction between beryllium and leucoquinizarin was studied both spectrophotometrically and spectrofluorimetrically, and methods for the determination of beryllium are proposed on the basis of the 1 : 1 chelate formed. The yellow chelate is formed at pH 5.3–5.5 in a medium containing 20% of ethanol, and the absorption is measured at 438 nm. The molar absorptivity (1.2 × 104 l mol–1 cm–1) allows the determination of 0.1–0.8 p.p.m. of beryllium. The fluorimetric method allows the determination of 5–100 p.p.b. of Be2+ in a medium containing acetate buffer (pH 4.6) and 70% of ethanol (λexc= 450 nm, λem= 476 nm). The fluorimetric method has been applied to the determination of beryllium in an aluminium alloy.

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