接触反応とフロー分析法を用いる超微量金属イオンの吸光光度法の研究(博士論文要録)  [in Japanese] Studies on Spectrophotometric Analysis for Ultratrace Amounts of Metal Ions Coupled with Catalytic Reactions and Flow-Based Techniques(Digest of Doctoral Dissertation)  [in Japanese]

At first, a copper- and/or iron-catalyzed coupling reaction of p-anisidine with N, N-dimethylaniline in the presence of hydrogen peroxide was investigated by batchwise and flow-based methods for the determination of copper and iron in natural water samples. The addition of some ligands (neocuproine for copper and 1,10-phenanthroline for iron) activated the catalytic effects. A flow injection (FI) method using catalytic reactions with a serial flow cell, having two cell compartments, was also applied to the successive assay of labile and inert complexes with humic acid for the characterization of copper and iron complexes. In addition, a sensitive and rapid FI spectrophotometric method was proposed for the determination of cobalt in cobalt alloy, pepperbush leaves and vitamin B_<12>. It is based on a redox reaction of cobalt(II) with iron(III) in the presence of nitro-PAPS, producing a iron(II)-nitro-PAPS complex. Finally, a sequential injection (SI) method with a lab-on-valve (LOV) format using 5-Br-PSAA was developed for the simultaneous spectrophotometric determination of copper and iron. The computer-controlled SI-LOV system was useful for routine, durable and automated assays of copper and iron in industrial waste water samples. The flow-based analytical techniques with FIA and SI-LOV should be noticed as an environmentally benign technology.