University of North Florida
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Contact Info

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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Norio Teshima

Abbrev:
Teshima, N.
Other Names:
Address:
Department of Applied Chemistry, Aichi Institute of Technology, 1247, Yachigusa, Yakusa-cho, Toyota-shi, Aichi 470-0392, Japan
Phone:
NA
Fax:
+81-565-48-0076

Citations 7

"Flow Injection Determination Of Copper(II) Based On Its Catalysis On The Redox Reaction Of Cysteine With Iron(III) In The Presence Of 1,10-phenanthroline"
Talanta 1999 Volume 50, Issue 1 Pages 41-47
Norio Teshima, Hideyuki Katsumata, Makoto Kurihara, Tadao Sakai and Takuji Kawashima

Abstract: A redox reaction of cysteine with iron(III) proceeds slowly in the presence of 1,10-phenanthroline (phen). However, this reaction is accelerated in the presence of copper(II) as a catalyst, producing an iron(II)-phen complex (lambda(max) = 510 nm). A sensitive spectrophotometric flow injection method is proposed for the determination of copper(II) based on its catalytic action on this redox reaction. The dynamic range was 0.1-10 ng mL-1 of copper(II) with a relative standard deviation of 1.0% (n = 10) for 1.0 ng mL-1 of copper(II) at a sampling rate of 30 h-1. The detection limit (S/N = 3) is 0.04 ng mL-1. The proposed method was successfully applied to the determination of copper in river water as a certified reference material.

"Flow Injection Analysis Bibliography (28)"
J. Flow Injection Anal. 1997 Volume 14, Issue 2 Pages 203-217
Teshima, N.

Abstract: FIA bibliography
Bibliography

"Flow Injection Analysis Bibliography (27)"
J. Flow Injection Anal. 1997 Volume 14, Issue 1 Pages 68-87
Teshima, N.

Abstract: NA
Bibliography

"Portable Battery-powered Flow Injection Analyser"
J. Flow Injection Anal. 1996 Volume 13, Issue 2 Pages 169-170
Teshima, N.

Abstract: An overview is presented of the development of the cited analyzer. equipped with a Ni-Cd rechargeable battery. An example is given of a portable flow injection analyzer. for volatile ethanol using semiconductor gas sensors. (6 references).
Ethanol Sensor Portable Instrumentation

"Application Of FIA To The Measurement Of NOx And SOx In Air And Environmental Water Samples At Nagoya And Its Environs"
Bunseki Kagaku 2000 Volume 49, Issue 6 Pages 455-462
Norio Teshima, Tadao Sakai, Seiji Yasuda and Keiro Higuchi

Abstract: Flow injection analysis (FIA) was applied to the simultaneous determination of nitrogen monoxide (NO), nitrogen dioxide (NO2) and sulfur dioxide (SO2) as air pollutants collected by using a passive sampling device. NO and NO2 were determined based on a diazotization/coupling reaction with a copperized cadmium (Cd/Cu) reduction column installed in the FIA system. A NOx (NO + NO2) collection filter was coated with PTIO (2-phenyl-4,4,5,5-tetramethylimidazoline-3-oxide-1-oxyl), which oxidized NO to NO2, together with triethanolamine for collecting NO2. However, the residual PTIO that coexisted in the extract for a FIA. measurement interfered with the diazotization/coupling reaction. We found that the interference of the residual PTIO can be completely removed by using an on-line Cd/Cu column in the FIA system. An FIA method using dimethylsulfonazo III-barium chelate was used for SO2 determination. By using these FIA systems, NO, NO2, NOx and SO2 in air samples collected at Nagoya and its environs were monitored, and the relation between the results and the weather conditions was considered. On the other hand, the same proposed FIA methods were applied to monitoring the concentrations of nitrite nitrogen and nitrate nitrogen in river water, pond water, rain water and seawater, and of sulfate ion in seawater. The proposed FIA systems provide simple and rapid methods with high precision for the determinations of nitrogen oxides and sulfur oxides, and are thus useful for investigating the movement of these pollutants in air and water samples.

"Development Of Novel Redox Systems In Potentiometry And Its Application To Analytical Chemistry"
Bunseki Kagaku 1996 Volume 45, Issue 12 Pages 1151-1152
Teshima, N.

Abstract: A brief account is given of analytical applications arising from the modification of the redox potential of a metal/metal-ion system by complexation of the ions with a ligand. Thus, V(IV) can be titrated potentiometrically with Fe(III), and Co(II) with V(V) or Cr(VI), in the presence of 1,10-phenanthroline or 2,2'-bipyridyl. Flow injection spectrophotometric procedures based on this principle are also mentioned. These are applicable to determination of the ligands as well as the metals; a method for measuring the complexing capacity of natural water was developed on this basis.
Environmental Environmental Potentiometry Spectrophotometry Redox

"Simultaneous Flow Injection Determination Of Ascorbic Acid And Cysteine Using Double Flow Cell"
Anal. Chim. Acta 2001 Volume 438, Issue 1-2 Pages 21-29
Norio Teshima, Takuya Nobuta and Tadao Sakai

Abstract: A spectrophotometric method was developed for the simultaneous determination of ascorbic acid (AA) and cysteine (Cys) by flow-injection (FI) system equipped with a double flow cell, which was installed in a double-beam spectrophotometer. Iron(III) is quantitatively reduced to iron(II) with AA or Cys in the presence of 1,10-phenanthroline (phen), producing an iron(II)-phen complex(lambda (max) = 510 nm). It was found that copper(II) greatly accelerated the reduction reaction of iron(III) with Cys, while that with AA was little affected by copper(II). On the basis of the difference in the rate between the two reactions, AA and Cys can be determined in the ranges 2 x 10^-7 to 4 x 10^-5 M and 1 x 10^-6 to 9 x 10^-5 M, respectively at a rate of 45 samples per hour. The limits of detection (S/N = 3) were 1 x 10^-7 M for AA acid 2 x 10^-7 M for Cys. A batchwise method for the simultaneous determination of both reductants was also studied. The proposed Fl method was successfully applied to the simultaneous determination of both analytes in pharmaceutical formulation.
Ascorbic acid