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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Kin-ichi Tsunoda

Abbrev:
Tsunoda, K.I.
Other Names:
Address:
Department of Chemistry, Faculty of Engineering, Gunma University, 1-5-1 Tenjin-cho, Kiryu, Gunma, 376-8515, Japan
Phone:
+81-277-30-1250
Fax:
+81-277-30-1251

Citations 5

"Liquid Core Waveguide Spectrophotometry For The Sensitive Determination Of Nitrite In River Water Samples"
Anal. Sci. 2006 Volume 22, Issue 7 Pages 1017-1019
Hiromi TAKIGUCHI1), Azusa TSUBATA1), Makoto MIYATA1), Tamao ODAKE1), Hiroki HOTTA1), Tomonari UMEMURA2) and Kin-ichi TSUNODA1)

Abstract: A flow injection analysis system was built with a liquid core waveguide spectrophotometric detector using an 80 cm Teflon AF-1600 capillary tube (2,2-bistrifluoromethyl-4,5-difluoro-1,3-dioxole/tetrafluoroethylene). The system was applied to determine nitrite ion in river water samples. The lower limit of detection for nitrite was 2.1 nmol L-1 (0.1 ng dm -3 as NO2-) and the relative standard deviation of measurements was typically 0.56% (n = 5) at 0.21 ?mol L-1. 2006 © The Japan Society for Analytical Chemistry.

"Determination Of Lead By Hydride Generation Inductively Coupled Plasma Mass Spectrometry"
Anal. Chim. Acta 2000 Volume 419, Issue 1 Pages 65-72
Jinxiang Li, Fang Lu, Tomonari Umemura and Kin-ichi Tsunoda

Abstract: A method for the determination of lead by hydride generation inductively coupled plasma mass spectrometry was explored using oxalic acid-ammonium cerium(IV) nitrate-sodium tetrahydroborate as the reaction matrix and a homemade hydride generator. The sensitivity achieved was ~7.5 times higher than that obtained using an ultrasonic nebulizer. The detection limit (3s) and the signal precision (RSD, n=13) were 0.007 µg L-1 and 0.21% for 1 µg L-1 Pb, respectively, Fe(III) or Ni(II) up to 10 mg L-1 did not affect the hydride generation of 1 µg L-1 Pb. Additionally, the present system equipped with an injector valve and a 500 µl sample loop was also operated in the flow injection mode. Because of the short memory effect (typically 25-30 s), six replicate injections of a solution containing 4 µg L-1 Pb were performed within 5 min. The RSD values (n=13) were 0.33 and 1.41% for peak height and area measurements, respectively. The method was applied to the determination of lead in three environmental reference materials involving natural water, plant tissue and pond sediment. Good agreement was obtained between the certified values and the experimental results with the precisions (RSD, n=5) less than 1.0% for both continuous and flow injection modes.
Lead Environmental Pond Plant Mass spectrometry Interferences Volatile generation Reference material Method comparison

"Application Of The Glass Slab Optical Waveguide To The Spectrophotometric Determination Of The Iron(II)-1,10-phenanthroline Complex By Flow Analysis"
Anal. Chim. Acta 1995 Volume 299, Issue 3 Pages 327-332
Kin-ichi Tsunoda*, Hiromitsu Itabashi and Hideo Akaiwa

Abstract: An Fe(III) solution (25 ml, 0.04-0.32 mM), 1 mL of 10% hydroxylamine solution, 10 mL of 10% sodium acetate solution and 10 mL of 0.1% 1,10-phenanthroline (phen) solution were mixed, allowed to stand for 5 min and the mixture was diluted to 100 mL. A 0.5 mL portion of the color-developed [Fe(phen)3]2+ solution was introduced into a carrier stream of water and 0.2 mM sodium dodecylbenzene sulfate, and an ion pair was formed in a mixing coil. This was absorbed on a glass slab optical waveguide and caused the attenuation of light from a green He-Ne laser at 543.5 nm or an Ar ion laser at 488 and 515 nm. The fabrication of K+-doped and r.f.-sputtered glass slab optical waveguides is described. The waveguide made by r.f. sputtering of Corning 7059 glass and the Ar laser as light source gave the best sensitivity, which was 9.5 times higher than that obtained with a conventional spectrophotometer for a 0.5 mL sample.
Iron(2+) Spectrophotometry Sample preparation Apparatus Detector Ion pair extraction Laser Surfactant

"Characteristics Of Potassium Ion-doped Glass Slab Optical Waveguide As An Absorption Cell And Its Application To The Spectrophotometric Detection Of Methylene Blue"
Anal. Chim. Acta 1993 Volume 276, Issue 1 Pages 133-139
Kin-ichi Tsunoda*, Hiromitsu Itabashi and Hideo Akaiwa

Abstract: The characteristics of the K+-doped glass-slab optical waveguide are discussed in terms of effective path length and relative sensitivity. The waveguide was coated with octadecylsilane and used in the spectrophotometric detection of methylene blue (C. I. Basic Blue 9) by FIA. The coated waveguide could be used for the detection of methylene blue when an ion pair was formed with dodecyl sulfate.
Methylene blue Spectrophotometry Detector Cuvette Apparatus Ion pair formation

"Sensitive Measurement Of Methylene Blue Active Substances By Attenuated Total Reflection Spectrometry With A Trimethylsilane-modified Glass Slab Optical Waveguide"
Analyst 2002 Volume 127, Issue 1 Pages 149-152
Tomonari Umemura, Yuichi Kasuya, Tamao Odake and Kin-ichi Tsunoda

Abstract: Attenuated total reflection spectrometry with a slab optical waveguide (SOWG) was explored for the simple, rapid and sensitive measurement of total anionic surfactants by the methylene blue active substance (MBAS) method. A fused-silica sheet used as a guiding layer was modified with trimethylsilane (TMS) to extract and concentrate the MBASs on the SOWG surface. Based on preliminary studies of the adsorption behavior and visible ATR spectrum of MB on the modified silica surface, a detection wavelength of 600 nm was chosen for the sensitive measurement of anionic surfactants. When the concentration of MB was set at 10 muM in the final measurement solution. the calibration curve for a typical anionic surfactant (sodium dodecylbenzenesulfonate) was linear up to 0.6 muM and the detection limit was 0.07 muM. The proposed method was applied to the determination of total anionic surfactants in river water.