论文信息 - Spectrophotometric Determination of Iron by 2-(5-Bromo-2-pyridylazo) 5-diethylaminophenol

Spectrophotometric Determination of Iron by 2-(5-Bromo-2-pyridylazo) 5-diethylaminophenol

Abstract The system Fe3+ -5-Br-PADAP, in the presence of Triton X-100, has been studied. The molar ratio of Fe3+ /5-Br-PADAP in the complex is 1:2 at pH 2–6; the molar absorptivity is 8.64 × 104 at 595 nm and the apparent stability constant is 1.84 × 1013 . A more sensitive spectrophotometric method for iron determination was developed. The iron contents of Chinese leaf tea samples determined by this method are 0.024% for Qimen Black Tea and 0.037% for Tunxi Green Tea. The results are in agreement with those obtained by the o-phenanthroline method.

Y. Fang | W. Fu-sheng | Z. Yu-rui

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