“…In the above-mentioned detection system with a single beam, two flow cells (volume, 31.4 µl, path length, 10 mm) were aligned in the same optical path. Yamane et al 3 proposed the simultaneous intercalation of a reagent plug and two small sample plugs into the same carrier stream by a 16-way valve for the determination of Fe(III) and Fe(II). Simultaneous FIA configurations have been presented for the determination of cobalt and nickel based on differential kinetics with a single detector by Fernandez et al 4 In these detection systems, the difference in the rate of a reaction containing an oxidation-reduction reaction, a delayed coil and a single flow cell were often used.…”