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Selective Spectrophotometric Determination of Th(IV) with 2- 2-(5-Bromo-2-Pyridylazo)-5-diethylaminophenol

Authors: 
Ali Z. Abu Zuhri
Journal Name: 
Microchemical Journal
Volume: 
29
Issue: 
3
Pages From: 
345
To: 
349
Date: 
Friday, June 1, 1984
Abstract: 
A spectrophotometric study of the Th(IV) complex of a new reagent 2-(5-Bromo-2- pyridylazo)-5-diethylaminophenol (5-Br-PADAP) is presented. A reddish brown complex is formed at pH 4.86, and shows maximal absorbance at 580 nm with molar absorptivity of 1.66 × 10^5 mol−1 cm−1 liter. Beer's law is obeyed over the range 0.0 to 15 μg of thorium. Rare earths ions like La3+, Ce3+, and Y3+ do not interfere because they form complexes with 5-Br-PADAP at higher pH's (>9.94) (1). A new method for determining trace amounts of thorium is proposed, which possesses the advantages of high sensitivity and selectivity.