University of North Florida
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Stuart Chalk, Ph.D.
Department of Chemistry
University of North Florida
Phone: 1-904-620-1938
Fax: 1-904-620-3535
Email: schalk@unf.edu
Website: @unf

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M. Aihara

Abbrev:
Aihara, M.
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Faculty of Home Life Science, Fukuoka Women's University, Fukuoka 813 Japan
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Citations 6

"Flow Injection Study Of Europium(III)-benzoyltrifluoroacetone-trioctylphosphine Oxide System In Micellar Solution"
J. Flow Injection Anal. 1993 Volume 10, Issue 2 Pages 236-244
Makoto Aihara* and Yuko Ueno

Abstract: A flow injection fluorimetric method for the determination of Eu(III), based on the solubilization of its ternary complex with benzoyltrifluoroacetone (BFA) and trioctylphosphine oxide (TOPO) in micellar solution is described. Using a previously described flow injection manifold (cf. Analyst, 1986, 111, 641) the sample was injected into a carrier stream (1 ml/min; no details given), which was merged with a stream (1 ml/min) of 0.5 mM BFA and 0.5 mM TOPO in 0.5% nona(oxyethylene) dodecyl ether of pH 3.5. After passing through a reaction coil (1 m x 0.5 mm i.d.) the fluorescence intensity was measured at 596 nm (excitation at 355 nm). Calibration graphs were linear from 0.2-50 µM-Eu(III) and the RSD (n = 10) was 0.7%. Th effects of other lanthanoid ions are tabulated; no interference was observed from fivefold excesses of Ce(IV), La, Pr, Sc and Y or equal amounts of Dy, Er, Gd, Ho, Lu, Nd, Tb or Tm.
Europium(3+) Fluorescence Interferences Micelle Surfactant

"A Flow Injection/stopped-flow Kinetic Study Of The Ligand Substitution Of Europium(III) Complex With Thenoyltrifluoriacetone And Trioctylphosphine Oxide By Aminopolycarboxylic Acid"
J. Flow Injection Anal. 1991 Volume 8, Issue 1 Pages 42-48
Makoto Aihara, and Naomi Mori

Abstract: The ligand substitution of europium(III) complex with thenoyltrifluoroacetone(TTA) and trioctylphosphine oxide(TOPO) by aminopolycarboxylic acid(ethylenediaminetetraacetic acid (EDTA) or trans-l,2-cyclohexanediamine-N,N,N',N'-tetraacetic acid(CyDTA)} in non-ionic surfactants was investigated by flow injection/stopped-flow method. By analyzing the decrease of fluorescence of Eu(TTA13 (TOPO)2, the substitution rate was found to be a first-order rate law with respect to the concentration of Eu(TTA13 (TOP012. The pH dependence of the rate constants can be explained by the mechanism of the rate determination step.
Europium(3+) Kinetic Stopped-flow

"Flow Injection Analysis Of Samarium(III) And Europium(III) Based On Solubilizing The Ternary Complexes With Thenoyltrifluoriacetone And Trioctylphosphine Oxide In Micellar Solution"
J. Flow Injection Anal. 1989 Volume 6, Issue 2 Pages 128-136
Makoto Aihara, and Tomoko Nakashimada

Abstract: A portion (100 µL) of sample solution, containing Sm(III) (0.15 to 1.5 µg mL-1), was injected into a carrier stream (1 mL min-1) of 0.5% BL-9EX (nonaoxyethyleneglycoldodecyl ether; Nikko Chemical Co. Ltd.) in acetate buffer of pH 3.5 and reacted with 0.4 mM reagent solution (1 mL min-1) containing thenoyltrifluoroacetone (I) and 0.4 mM trioctylphosphine oxide (II) in the surfactant solution in a reaction coil (1 m x 0.5 mm i.d.). After 33 to 35s, the fluorescence of the ternary complex formed was measured at 596 nm (excitation at 355 nm). The calibration graph was rectilinear over the range studied and the coefficient of variation was 4%. In the determination of 1.2 µg mL-1 of Sm(III), equal amounts of most rare-earth metals (tabulated) did not interfere significantly. Sampling rate was 60 samples h-1. The method was also applied in the determination of Eu(III).
Samarium(III) Europium(3+) Fluorescence Buffer Surfactant Complexation Interferences Micelle

"Flow Injection Spectrofluorimetric Determination Of Samarium(III) Based On Quenching Of Calcein Blue Fluorescence"
Fukuoka Joshi Daigaku Kaseigakubu Kiyo 1990 Volume 21, Issue 1 Pages 5-9
AIHARA Makoto; UCHIKADO Masako

Abstract: Calcein blue has a strong fluorescence (excitation at 370 nm, emission at 440 nm) that is sensitively quenched by the presence of trivalent lanthanide ions. The analysis system consists of a reciprocating pump with two channels (one for HCl carrier solution, and another for reagent solution), a 6-way sample injection valve, a 3 m reaction coil, a spectrofluorometer with a 32 mL flow cell, a 1 m back-pressure coil, and polyethylene tube manifold (0.5 mm i.d.). A series of experiments was conducted to find the optimum analysis conditions for the system. A 100 mL of sample solution containing 10^-6 ~ 10^-4 M Sm(III) was injected into the carrier stream under the following optimum analysis conditions: concentration of reagent, 7 x 10^-5 M in tris(hydroxymethyl)[aminomethane buffer solution at pH 8.0; carrier solution, 10^-4 M HCl; flow rate, 1.0 mL min-1; and manifold tube length, 3 m. The relative standard deviation was ≤0.11%. The system can analyze 40 sample solutions per h, and can be applied to all members of the lanthanides with equal sensitivity.
Samarium(III) Metals, lanthanides Fluorescence Quenching Optimization

"Flow Injection Spectrofluorimetric Determination Of Terbium(III) With Ethylenediamine Bis-(o-hydroxyphenylacetic Acid)"
Fukuoka Joshi Daigaku Kaseigakubu Kiyo 1989 Volume 20, Issue 1 Pages 29-33
Aihara, M.;Kobayakawa, M.;Taketatsu, T.

Abstract: Sample solution (100 µL) containing 0.1 to 10 µM Tb(III) were injected at 40 h-1 into a stream (0.8 mL min-1) of 0.1 mM HCl and mixed with 0.6 mM ethylenediaminebis(o-hydroxyphenylacetic acid) (pH 7.7) in a reaction coil (2 m x 0.5 mm) and the chelate formed was determined fluorimetrically at 545 nm (excitaion at 295 nm). Equimolar amounts of other rare-earth ions did not interfere. The coefficient of variation was 1.2%.
Terbium(III) Fluorescence pH Injection technique Chelation Interferences

"Flow Injection Spectrofluorimetric Determination Of Cerium(IV) With 1-amino-4-hydroxyanthraquinone"
Fukuoka Joshi Daigaku Kaseigakubu Kiyo 1988 Volume 19, Issue 1 Pages 99-103
AIHARA Makoto, KOBAYAKAWA Michiyo

Abstract: 1-Amino-4-hydroxyanthraquinone is oxidized by Ce(IV), with 5 mM KClO3 as catalyst, and the fluorescent product is determined at 541 nm (excitation at 489 nm). The calibration graph is rectilinear for 30 to 100 µM-Ce. The sampling rate is 45 h-1.
Cerium(4+) Fluorescence Stopped-flow