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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NIES 7

Classification: Reference Material -> NIES -> 7 -> Tea leaves

Citations 2

"Determination Of Manganese By Flow Injection Analysis Based On Its Catalytic Effect On The Oxidative Coupling Reaction Of 3-methyl-2-benzothiazolinone Hydrazone With NN-dimethylaniline"
Anal. Sci. 1991 Volume 7, Issue 1 Pages 97-101
Y. MIYATA, T. HIRANO, S. NAKANO and T. KAWASHIMA

Abstract: Sample solution was injected into a carrier stream of aqueous 1.2% H2O2 and reacted at 50°C in a reaction coil (3 m) with 0.1 M citrate - 0.2 M Tris buffer solution (pH 11), 30 mM NN-dimethylaniline - 3 mM 3-methyl-2-benzothiazolinone hydrazone - 3 mM 1,10-phenanthroline. The mixture was cooled to 25°C in a 1-m reaction coil and the absorbance was measured at 590 nm. The calibration graph was rectilinear for 4 to 30 ng mL-1 of Mn and the coefficient of variation were 1.9 to 4.2%. The method was applied in the analysis of standard reference materials, the results obtained compared well with certified values.
Manganese Spectrophotometry Buffer Catalysis Heated reaction Reference material

"Flavin Mononucleotide Chemiluminescence For Determination Of Traces Of Copper(II) By Continuous-flow And Flow Injection Methods"
Bull. Chem. Soc. Jpn. 1985 Volume 58, Issue 4 Pages 1137-1142
Masaaki Yamada,Hideshi Kanai and Shigetaka Suzuki

Abstract: Flow injection analysis, with chemiluminescence detection, is used to determine traces of copper(II) by means of the flavin mononucleotide-hydrogen peroxide-phosphate buffer system. This permits the determination of copper(II) more selectively than any other chemiluminescence system with a detection limit of 0.03 ng (20 pL sample injection) or 0.06 ng mL-1 (continuous sample flow). The linear range is 3 orders of magnitude, the sampling rate is 120 h-1, and the relative standard deviation is 3.1% for 1 ng Cu(II) (n=10). Iron(II) and chromium(III and VI), the strongest enhancer after copper(II), provide signals 2-3% of that for copper(II). Effect of surfactant micelles on the signal for copper is also discussed. The method is successfully applied to real samples.
Copper Chemiluminescence Micelle Interferences