Paper-Based Analytical Device for Zinc Ion Quantification in Water Samples with Power-Free Analyte Concentration
AbstractInsufficient sensitivity is a general issue of colorimetric paper-based analytical devices (PADs) for trace analyte detection, such as metal ions, in environmental water. This paper demonstrates the colorimetric detection of zinc ions (Zn2+) on a paper-based analytical device with an integrated analyte concentration system. Concentration of Zn2+ ions from an enlarged sample volume (1 mL) has been achieved with the aid of a colorimetric Zn2+ indicator (Zincon) electrostatically immobilized onto a filter paper substrate in combination with highly water-absorbent materials. Analyte concentration as well as sample pretreatment, including pH adjustment and interferent masking, has been elaborated. The resulting device enables colorimetric quantification of Zn2+ in environmental water samples (tap water, river water) from a single sample application. The achieved detection limit of 0.53 μM is a significant improvement over that of a commercial colorimetric Zn2+ test paper (9.7 μM), demonstrating the efficiency of the developed analyte concentration system not requiring any equipment. View Full-Text
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Kudo, H.; Yamada, K.; Watanabe, D.; Suzuki, K.; Citterio, D. Paper-Based Analytical Device for Zinc Ion Quantification in Water Samples with Power-Free Analyte Concentration. Micromachines 2017, 8, 127.
Kudo H, Yamada K, Watanabe D, Suzuki K, Citterio D. Paper-Based Analytical Device for Zinc Ion Quantification in Water Samples with Power-Free Analyte Concentration. Micromachines. 2017; 8(4):127.Chicago/Turabian Style
Kudo, Hiroko; Yamada, Kentaro; Watanabe, Daiki; Suzuki, Koji; Citterio, Daniel. 2017. "Paper-Based Analytical Device for Zinc Ion Quantification in Water Samples with Power-Free Analyte Concentration." Micromachines 8, no. 4: 127.
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