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  • Title: Direct colorimetric detection of copper(II) ions in sampling using diffusive gradients in thin-films.
    Author: McGifford RW, Seen AJ, Haddad PR.
    Journal: Anal Chim Acta; 2010 Mar 03; 662(1):44-50. PubMed ID: 20152264.
    Abstract:
    A novel binding phase was developed for use in diffusive gradients in thin-film (DGT) sampling for Cu(II) by employing methylthymol blue as a chelating and chromogenic agent. Methylthymol blue was adsorbed onto beads of Dowex 1 x 8 resin (200-400 mesh) and the resin beads were then immobilised onto an adhesive disc. Analysis of exposed binding discs by either UV-vis spectrophotometry or computer imaging densitometry provided robust quantification of adsorbed Cu(II) in the 0.2-1 microg cm(-2) range, allowing detection at microg L(-1) concentrations in the test solution (ca. 17 microg L(-1) for a 24 h deployment), and in good agreement with established DGT theory. The method was shown to be a potential replacement for binding phases based on Chelex 100 where a colorimetric response to a specific metal is desired.
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