Analytical Sciences

Abstract − Analytical Sciences, 24(3), 411 (2008).

Characteristic Redox Potential-Time Curve in the Iron(II)/Nitric Acid Autocatalytic Reaction and Its Application to a Time Measurement-determination of Folic Acid
Jun KATO and Shukuro IGARASHI
Department of Biomolecular Functional Engineering, Faculty of Engineering, Ibaraki University, 4-12-1 Nakanarusawa, Hitachi, Ibaraki 316-8511, Japan
A characteristic redox potential-time curve of the iron(II)/nitric acid autocatalytic reaction was applied to a time measurement-determination for sub-µM levels of folic acid. The determination range was 7.5 × 10-7 - 1.5 × 10-5 M, the detection limit (3 σ) was 5.9 × 10-7 M, and the relative standard deviation was 3.6% (n = 5).