Colorimetric sensing of H2PO4? using a Pb2+ complex of a pyridylazo dye in aqueous solution |
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| Authors: | Mahiro Shimizu Shunichi Aikawa Yasumasa Fukushima |
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| Affiliation: | 1. Faculty of Science and Engineering, Toyo University, Saitama, Japan;2. Research Institute of Industrial Technology, Toyo University, Saitama, Japan |
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| Abstract: | This study develops a sensitive and selective colorimetric probe for the detection of dihydrogen phosphate (H2PO4?) based on a lead ion (Pb2+) complex of a commercially available pyridylazo dye (PAPS) in aqueous media under physiological conditions. The complex was made by adding Pb2+ to PAPS in a 1:1 stoichiometric ratio (PAPS-Pb2+), which was accompanied by the remarkable solution change from yellow to purple. The colorimetric sensing of H2PO4? over other anions with PAPS-Pb2+ occurred owing to the regeneration of original PAPS by the interaction of H2PO4? with Pb2+ in a 1:2 molar ratio. Moreover, the H2PO4? detection was less affected by the presence of other coexisting competitive anions. The colorimetric naked-eye behaviour of PAPS-Pb2+ rendered a useful and convenient probe for the detection of H2PO4? via the indicator displacement assay. |
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