Characteristic redox potential-time curve in the iron(II)/nitric acid autocatalytic reaction and its application to a time measurement-determination of folic acid

Abstract

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 (3σ) was 5.9 × 10-7 M, and the relative standard deviation was 3.6% (n = 5). 2008 © The Japan Society for Analytical Chemistry.