title: Flow injection analysis combined with a hydrothermal flow reactor: application to kinetic determination of trace amounts of iridium using a water-soluble porphyrin.
abstract: A new type of flow injection analysis (FIA) system combined with an extremely high temperature reactor, namely hydrothermal flow injection analysis (HT-FIA), has been successfully constructed for the first time. Fundamental characteristics of HT-FIA system, such as limit temperature, pressure, and flow rate, were examined as an analytical tool. To demonstrate the potential of HT-FIA, the catalytic activity of Ir(IV) for the degradation of a water-soluble porphyrin, 5,10,15,20-tetraphenyl-21H,23H-porphinetetrasulfonic acid (TPPS), was applied for the determination of trace amounts of Ir(IV). Although the indicator reaction is very slow at room temperature, HT-FIA system enables to accelerate the reaction. A linear calibration curve was acquired at 10(-8)M level of Ir(IV) and the interferences of platinum group metal ions were examined. The detection limit of Ir(IV) was 5.8 × 10(-9)M and a fairly high-throughput analysis, of which more than 30 samples can be analyzed within 80 min, was achieved.
authors.affiliation: Department of Applied Chemistry, Graduate School of Engineering, Osaka Prefecture University, Gakuen-cho 1-1, Sakai, Osaka 599-8531, Japan. kawamura@chem.osakafu-u.ac.jp
authors.forename: Kunio
authors.initials: K
authors.lastname: Kawamura
authors.forename: Keisuke
authors.initials: K
authors.lastname: Ikoma
authors.forename: Shukuro
authors.initials: S
authors.lastname: Igarashi
authors.forename: Hideaki
authors.initials: H
authors.lastname: Hisamoto
authors.forename: Toshio
authors.initials: T
authors.lastname: Yao
mesh_terms: D002138:Calibration; D002384:Catalysis; D003300:Copper / Q000737:chemistry; D017022:Flow Injection Analysis / Q000295:instrumentation / Q000379:methods*; D006358:Hot Temperature; D006863:Hydrogen-Ion Concentration; D007495:Iridium / Q000032:analysis* / Q000737:chemistry; D007700:Kinetics; D010087:Oxides / Q000737:chemistry; D010984:Platinum / Q000737:chemistry; D011166:Porphyrins / Q000737:chemistry*; D015203:Reproducibility of Results; D012967:Sodium Dodecyl Sulfate / Q000737:chemistry; D012995:Solubility; D014867:Water / Q000737:chemistry*
chemical_list: D010087:Oxides; D011166:Porphyrins; D014867:Water; C016136:tetraphenylporphine sulfonate; D012967:Sodium Dodecyl Sulfate; D007495:Iridium; D010984:Platinum; D003300:Copper