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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Norimasa Yoza

Abbrev:
Yoza, N.
Other Names:
Address:
Department of Chemistry, Faculty of Science, Kyushu University, Hakozaki, Fukuoka 812 Japan
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Citations 14

"Flow Injection Analysis And Its Application To Environmental Analysis"
Kankyo to Sokuteigijutsu 1982 Volume 10, Issue NA Pages 22-NA
Yoza, N.

Abstract: NA
Chemical oxygen demand Phosphate Phosphates Environmental Spectrophotometry

"High Performance Of Photodiode Array Detection In FIA"
J. Flow Injection Anal. 1990 Volume 7, Issue 1 Pages 34-34
N . Yoza

Abstract: A review is presented, with four references, on the advantages of photodiode-array detection in FIA (flow injection analysis), in which improvement of performance as well as simplicity and economy of its use are discussed.
HPLC Spectrophotometry Review

"Flow Injection Analysis For Phosphorus Compounds"
J. Flow Injection Anal. 1987 Volume 4, Issue 2 Pages 86-97
Norimasa YOZA,* Tokunori YOKOTA,* Annika SJODIN,** and Jurgen MOLLER**

Abstract: A review is presented, with 26 references, of flow injection and HPLC methods for the determination of inorganic and biochemical P. Various Mo reagents are investigated for the determinations and the design of a flow system that can be used convertibly for both flow injection analysis and HPLC is described.
Phosphorus Water Spectrophotometry Review Speciation

"Flow Injection Analysis Bibliography (5)"
J. Flow Injection Anal. 1986 Volume 3, Issue 1 Pages 49-65
Yoshinobu Baba and Norimasa Yoza*

Abstract: Refs 342-500 (259 citations)
Bibliography

"Fate Analysis Of Phosphorus Compounds In Environmental Waters By Flow Injection Analysis And High Performance Liquid Chromatography"
J. Flow Injection Anal. 1986 Volume 3, Issue 1 Pages 37-46
Norimasa YOZA,* Yasushi SAGARA, Hitomi MORIOKA, Takashi HANDA, Hisanobu HIRANO,Yoshinobu BABA and Shigeru OHASHI

Abstract: The concept of 'fate analysis' of phosphorus compounds in aquatic media was explained with several examples; a phosphorus compound is dissolved in a sample water to be examined and the conversion of its chemical form is monitored as a function of time to evaluate the quality - the chemical property and biological activity - of the water. The difference between the concepts of speciation and fate analysis was described. The interchangeable use of a high-pressure flow injection system as an HPLC detector was recommended to achieve such fate analysis of pyrophosphate and tripolyphosphate in deionized water and river water. The FIA system was improved with respect to the preparation method of a Mo(V)-Mo(V1) reagent and the use of a dry reactor with a heating aluminum block (140°C). Fate analysis in deionized water indicated the abnormally high catalytic activity of the deionized water for the hydrolysis of pyrophosphate and tripolyphosphate. The catalyst with pseudo-enzymatic function in the deionized water was deactivated by being autoclaved at 121°C . Pyrophosphate and tripolyphosphate in river water were hydrolyzed more rapidly than one could expect from kinetic data in chemical hydrolysis, but more slowly than in the deionized water.
Phosphorus Environmental Environmental HPLC Spectrophotometry

"Flow Injection Analysis Bibliography (4)"
J. Flow Injection Anal. 1985 Volume 2, Issue 2 Pages 168-180
Yoshinobu Baba and Norimasa Yoza*

Abstract: Refs 226-341 (116 citations)
Bibliography

"Flow Injection Analysis Bibliography (3)"
J. Flow Injection Anal. 1985 Volume 2, Issue 1 Pages 61-68
Yoshinobu Baba and Norimasa Yoza*

Abstract: Refs 108-225 (118 citations)
Bibliography

"Flow Injection Analysis Bibliography (2)"
J. Flow Injection Anal. 1984 Volume 1, Issue 2 Pages 49-55
Norimasa Yoza*

Abstract: Refs 51-107 (55 citations)
Bibliography

"Flow Injection Analysis Bibliography (1)"
J. Flow Injection Anal. 1984 Volume 1, Issue 1 Pages 32-39
Baba, Y.;Yoza, N.

Abstract: First of a series of papers detailing the literature in FIA. 51 Citations (Refs 1-51)
Bibliography

"Detection Systems With A Photodiode-array Detector For Flow Injection And High Performance Liquid Chromatographic Determination Of Phosphinate, Phosphonate [phosphite] And Diphosphonate"
J. Chromatogr. A 1993 Volume 641, Issue 2 Pages 221-227
Tetsuya Nakazato and Norimasa Yoza

Abstract: Two flow-injection spectrophotometry systems and one HPLC system with post-column derivatization and spectrophotometric detection are described for the detection of the cited compounds. In system (i), sample was injected in to a stream of water (1 mL/min) which merged with a color reagent stream of 4.3 mM ammonium molybdate in 0.3 M H2SO4 (0.5 mL/min) before passing through a PTFE reaction coil (10 m x 0.5 mm) at room temp; the absorbance of the complex formed was measured from 200-800 nm. In system (ii), sample was injected into a stream of water (1 ml/min) which merged with an oxidant stream of 0.5 or 1% peroxodisulfate (0.5 mL/min) and passed through a PTFE reaction coil (10 m x 0.5 mm) at 140°C. The stream was merged with the color reagent stream (0.8 ml/min), passed through a reaction coil and subjected to spectrophotometric detection as above. System (iii), the HPLC method, was similar to system (ii), except sample was injected into a carrier stream of 0.02-0.10 M K2SO4 containing 0.1% sodium EDTA (1 mL/min) which was passed through a column (25 cm x 4 mm) of TSKgel SAX before merging with the oxidant stream. Use of a photodiode-array spectrophotometer was advantageous not only for quantitative purposes but for the spectral characterization of the colored reaction products. System (iii) was confirmed to be powerful for the quantitative analysis of mixed samples of the lower oxo-acids of phosphorus.
Phosphinate Phosphonate HPLC Spectrophotometry Photodiode Post-column derivatization

"Rapid And Sensitive Determination Of Nucleoside H-phosphonates And Inorganic H-phosphonates By High Performance Liquid Chromatography Coupled With Flow Injection Analysis"
J. Chromatogr. A 1990 Volume 507, Issue 1 Pages 103-111
Yoshinobu Baba, Mitsutomo Tsuhako, and Norimasa Yoza

Abstract: A solution (100 µL) containing phosphate, phosphonate, hypophosphonate and isohypophosphonate was injected into a stream (1 mL min-1) of 0.1 to 0.3 M KCl containing 0.1% of Na4EDTA, and the phosphonates were separated on a column (25 cm x 4.0 mm) of TSKgel SAX (10 µm) and then mixed with chromogenic reagent (MoV - Mo(VI); 0.8 mL min-1) and oxidizing agent [aqueous NaHSO3 (104 g l-1); 0.2 mL min-1]. After detection at 260 nm, the solution was passed through a 20-m reaction coil at 140°C and the absorbance of the heteropoly blue complex was measured at 830 nm. The detection limit was ~1 µM for inorganic, sugar and nucleoside phosphonates.
Phosphonates HPLC Spectrophotometry Column Detection limit Chromogenic reagent

"Measurement Of Enzymic Activity Of Inorganic Pyrophosphatase For Pyrophosphate By Flow Injection Analysis"
Chem. Lett. 1983 Volume 12, Issue 9 Pages 1433-1436
Norimasa Yoza, Hisanobu Hirano, Mayumi Okamura, Shigeru Ohashi, Yukio Hirai and Katsumaro Tomokuni

Abstract: The sample, containing phosphate, was injected into a stream of water (1 mL min-1), which was then merged with a stream of reagent (1 mL min-1) containing 0.03 M-Mo(VI), 0.3 M H2SO4 and 0.01 mM KH2PO4 (the phosphate was added to stabilize the baseline). After passing through a reaction coil (5 m x 0.5 mm; 30°C), the absorbance of the resulting solution was measured. The coefficient of variation was <1%. Phosphate could be determined in the range 0.01 to 1 mM. The method could be used to determine phosphate produced by the action of inorganic pyrophosphatase on pyrophosphate, and thus to assay the enzyme.
Phosphate Enzyme, pyrophosphatase Biochemical analysis Spectrophotometry Heated reaction Enzyme

"Flow Injection Analysis"
Bunseki 1984 Volume 33, Issue 7 Pages 513-522
Yoza, N.

Abstract: A review is presented, with 313 references mainly of 1980 to 1983 literature. A comprehensive table of elements, ions and compounds which can be determined by flow injection analysis is given, including detection methods, reagents used and relevant references.
Review

"Flow Injection Analysis"
Bunseki 1980 Volume 29, Issue 9 Pages 555-561
Yoza, N.

Abstract: A review with 100 references. (SFS)
Review