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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 × 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 μg cm−2 range, allowing detection at μg L−1 concentrations in the test solution (ca. 17 μg 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.

Item Type:	Refereed Article
Keywords:	Passive sampling; Binding phase; Colorimetry; Computer imaging densitometry; Copper; Methylthymol blue
Research Division:	Chemical Sciences
Research Group:	Analytical Chemistry
Research Field:	Separation Science
Objective Division:	Expanding Knowledge
Objective Group:	Expanding Knowledge
Objective Field:	Expanding Knowledge in the Chemical Sciences
UTAS Author:	McGifford, RW (Mr Russell McGifford)
UTAS Author:	Seen, AJ (Associate Professor Andrew Seen)
UTAS Author:	Haddad, PR (Professor Paul Haddad)
ID Code:	63144
Year Published:	2010
Web of Science® Times Cited:	11
Deposited By:	Austn Centre for Research in Separation Science
Deposited On:	2010-04-15
Last Modified:	2011-05-04
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