An all-solid-state monohydrogen phosphate sensor based on a macrocyclic ionophore

作者：Kumar Pankaj; Kim Dong Min; Hyun Myong Ho; Shim Yoon Bo^*

来源：Talanta, 2010, 82(4): 1107-1112.

DOI：10.1016/j.talanta.2010.06.011

• Ionophore
• Monohydrogen phosphate
• All-solid-state-membrane electrode
• Potentiometric titration
• Ion-selective electrode
• Anion sensor

An all-solid-state electrode, containing a synthesized chiral A(2)B(2) macrocyclic compound namely (4R,5R,15R,16R)-4,5,15,16-tetraphenyl-3,6,14,17-tetraazatricyclo [13.3.1.18.12] tetracosa-1(23),8,10,12(24)19,21-hexaene-2,7,13,18-tetrone as an ionophore in polyvinyl chloride (PVC)/polyurethane (PU) membrane matrix, has been developed for the selective quantification of monohythogen phosphate ions. The best performing membrane contained PVC, PU, ionophore, and nitrophenyl octyl ether as a plasticizer in the ratio 32.2:2.6:65.1 (w/w, %). It exhibited a near-Nernstian slope of 31.0 +/- 1.0 mV/decade of activity for HPO(4)(2-) ions in the concentration range of 1.0 x 10(-6) to 1.0 x 10(-2) M at pH 7.4. The detection limit of the electrode was 8.4 x 10(7) M and the life time was six weeks. The electrode displayed excellent selectivity for monohydrogen phosphate over other anions and the selectivity sequence was determined as HPO(4)(2-) > SO(4)(2-) > Ac(-) > NO(3)(-) > ClO(4)(-) >Cl(-) > I(-). The selective electrode for the monohydrogen phosphate ions was evaluated with a standard reference material (SRM 1548) and the titration of the sample solution.

• 出版日期2010-9-15