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- Title
Colorimetric sensing of H<sub>2</sub>PO<sub>4</sub><sup>−</sup> using a Pb<sup>2+</sup> complex of a pyridylazo dye in aqueous solution.
- Authors
Shimizu, Mahiro; Aikawa, Shunichi; Fukushima, Yasumasa
- 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.
- Subjects
AQUEOUS solutions; DYES &; dyeing; LEAD; ANIONS; SENSES; COLORIMETRIC analysis
- Publication
Coloration Technology, 2023, Vol 139, Issue 5, p544
- ISSN
1472-3581
- Publication type
Article
- DOI
10.1111/cote.12671