Abstract − Analytical Sciences, 31(10), 1099 (2015).
Advanced Stopped-in-Loop Flow Analysis with a Reagents-Merging Zones Technique for a Catalytic Successive Determination of Vanadium and Iron
Alejandro AYALA QUEZADA, Hiroya MURAKAMI, Norio TESHIMA, Tadao SAKAI, and Shoji MOTOMIZU
Department of Applied Chemistry, Aichi Institute of Technology, 1247 Yachigusa, Yakusa-cho, Toyota 470-0392, Japan
An advanced stopped-in-loop flow analysis (SILFA) is proposed for the catalytic determinations of vanadium and iron. The chemistry relies on a vanadium- or iron-catalyzed oxidative reaction of p-anisidine by bromate or hydrogen peroxide in the presence of an activator (Tiron or 1,10-phenanthlorine) to form a red dye (510 nm). Reagents for the vanadium- or iron-catalyzed reaction are well mixed by a reagents-merging zones technique. A sample solution is loaded together with well-mixed reagents into a loop in the SILFA configuration, followed by spectrophotometric detection. The advanced SILFA system provides a selective method for the trace determination of vanadium and iron.
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