Direct colorimetric detection of copper(II) ions in sampling using diffusive gradients in thin-films |
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Authors: | Russell W McGifford Paul R Haddad |
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Institution: | a School of Chemistry, University of Tasmania, Locked Bag 1371, Launceston, Tasmania 7250, Australia b Australian Centre for Research on Separation Science (ACROSS), School of Chemistry, University of Tasmania, Locked Bag 75, Hobart, Tasmania 7001, Australia |
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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 × 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. |
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Keywords: | Passive sampling Binding phase Colorimetry Computer imaging densitometry Copper Methylthymol blue |
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