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Analytical Letters Volume 25, 1992 - Issue 12
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Flow Injection Analysis

Flow Injection Analysis for Beryllium Determination With Chrome Azurol S as Chromogenic Agent

Les Kutsera Centre for Analytical and Environmental Chemistry, Department of Chemistry, Carleton University, Ottawa, Ontario, Canada, KlS 5B6
,
Hassan Ghaziaskar Centre for Analytical and Environmental Chemistry, Department of Chemistry, Carleton University, Ottawa, Ontario, Canada, KlS 5B6
&
Edward P. C. Lai Centre for Analytical and Environmental Chemistry, Department of Chemistry, Carleton University, Ottawa, Ontario, Canada, KlS 5B6
Pages 2289-2304 | Received 03 Jun 1992, Accepted 05 Aug 1992, Published online: 23 Sep 2006
 
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Abstract

A flow injection analysis system which employs a visible absorption detector is used for the determination of beryllium. Be(II) ions are detected by means of a complexation reaction between Be(II) and chrome azurol s as the chomogenic reagent. The reaction forms a stable 1:1 complex which appears dark red-violet. The optimum conditions for the determination are pH 4.15, 35% chrome azurol s, 3% buffer, 62% HCI and 1,3-phenylenediamine, flow rate of 1.0 mL/min, and wavelength at 570 nm. A concentration limit of 0.1 μg/mL (or 2 ng in 25 μ of a sample injected) of Be(II) can be detected, and the linear dynamic range extends to 100 μg/mL. Some interference limits are established in the presence of EDTA and thiosulfate which are used as masking agents.

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