A new kinetic spectrophotometic method for the determination of trace amount manganese(II) in Tea real samples has been described based on it s the catalytic effect on the oxidations of 1 - (2 – Pyridyl Azo) - 2 - Naphthol, (PAN), by potassium bromated in sulfuric acid. The reaction is followed spectrophotometrically by measuring the decrease in the absorbance at 547.5 nm. Under the optimum con...

The organized elements of the Orgueil Meteorite were examined by quantitative fluorescence microscopy. An effort was made to correlate possible morphology with the presence of the amino acid, tyrosine. Relative tyrosine levels were determined by the formation of fluorescent complexes between the tyrosine presem and 1-NITROS O 2-NAPHTHOL. The fluorescence levels produced by the tyrosine-nitroso ...