Rapid and Automated Analytical Methods for Redox Species Based on Potentiometric Flow Injection Analysis Using Potential Buffers

Table 3

Sensitivities to oxidative species.

Oxidative species	Sensitivity (mv/mM)^b		Enhancement factor, (A)/(B)
	(A) Observed in FIA system	(B) Calculated^a
BrO3−	10.6 × 10^3	31.3 (𝑚=6)	338
Cr2O72−	2.6 × 10^3	31.3 (𝑚=6)	83
H2O2	2.5 × 10^2 c	10.4 (𝑚=2)	24
ClO2−	6.9 × 10^3	20.9 (𝑚=4)	339
O3	8.0 × 10^2	10.4 (𝑚=2)	77

^aSensitivity calculated from (6).
^bBuffer, consisting of 0.01 M Fe(III)-0.01 M Fe(II) containing 0.4 M NaBr and 1.2 M H₂SO₄, was used as the reagent solution.
^cBuffer containing 0.5% ammonium molybdate to above buffer was used.