Binding: Digital
Format: HTML
Label: Elsevier
Manufacturer: Elsevier
Publication Date: July 01, 2004
Publisher: Elsevier
Studio: Elsevier

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This digital document is a journal article from Analytica Chimica Acta, published by Elsevier in 2004. The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.

Description:
A sequential injection system with spectrophotometric detection was proposed for the determination of copper, zinc and lead in brass. In view of the high analyte concentrations and the sensitivity of the involved catalytic methods, optimization of the flow system was carried out aiming mild reaction conditions. Copper and lead determinations were based on the catalytic effects of Cu^2^+ and Pb^2^+ on the oxidation rates of resorcinol and pyrogallol red by H"2O"2, respectively, and zinc determination involved precipitate formation after oxidation of 1-nafthylethylenediamine by K"3Fe(CN)"6. The analytical procedures were designed with some common parameters such as pH=9.0 (borate system), @l=530nm, and H"2O"2 as oxidizing agent; system geometry was maintained. The proposed system is rugged, and base line drift is not observed during 4h operation periods. Twenty samples are run per hour (60 determinations) and reagent consumption is minimal, thus avoiding drawbacks related to waste management. Precise results (R.S.D.<1.0%; n=7) are obtained and a detection limit of 1% (w/w) was estimated for the three analytes. Results were in agreement with flame atomic absorption spectrometry.

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