Increased Sensitivity Spectrophotometric Flow Analysis Method for Copper Determination in Water Samples

A reverse configured flow injection system was developed for the determination of copper in water samples. In this study, a bathocuproine disulfonic acid copper complexing reagent was used. In the presence of a reducing agent (hydroxylamine), the formation of complex was monitored at 484 nm. The det...

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Bibliographic Details
Published in:Analytical letters 2013-12, Vol.46 (18), p.2899-2911
Main Authors: Peixoto, Patricia S., Tóth, Ildikó V.
Format: Article
Language:English
Subjects:
Copper determination
Increased path-length flow cell
Liquid-core waveguide capillary cell
Reverse flow injection analysis
Visible spectrophotometry
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Summary:A reverse configured flow injection system was developed for the determination of copper in water samples. In this study, a bathocuproine disulfonic acid copper complexing reagent was used. In the presence of a reducing agent (hydroxylamine), the formation of complex was monitored at 484 nm. The determination range extended from 1 to 40 µg L −1 , with an applicable determination rate of 40 h −1 . The developed method was applied to the determination of copper in water samples (estuarine, river, and drinking water) and showed good accuracy (z-score below 2). The detection limit of 0.7 µg L −1 copper is consistent with the requirement of the target water samples. The developed method was also used for the comparison of different spectrophotometric flow cells. Alternative flow cells (U, Z shaped, and the liquid waveguide capillary cell) were compared in terms of their sensitivity and response to refractive index changes.
ISSN:0003-2719
1532-236X
DOI:10.1080/00032719.2013.821655