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
Website: @unf

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Citations 1

"Determination Of The Sum Of Rare-earth Elements By Flow Injection Analysis With Arsenazo III, 4-(2-pyridylazo) Resorcinol, Chrome Azurol S And 5-bromo-2-(2-pyridylazo) 5-diethylaminophenol Spectrophotometric Reagents"
Talanta 1988 Volume 35, Issue 4 Pages 259-265
D. B. Gladilovich, V. Kubán and L. Sommer

Abstract: The interactions of La(III) with the four cited spectrophotometric reagents were studied in both stationary and flow systems. In the stationary systems pH and unconsumed reagent most affected sensitivity; the most sensitive reagents were Chrome Azurol S [I (C. I. Mordant Blue 29), with cationic surfactant] and 4-(2-pyridylazo)resorcinol(II). Rare-earth chelates with 2-(5-bromo-2-pyridylazo)-5-diethylaminophenol decomposed in alkaline medium, making it an unsuitable reagent. Arsenazo III produced the lowest absorbances, but gave the best detection limits for Eu and Dy when the method was extended to all rare-earth metals. In flow systems only arsenazo III proved suitable for determining the sum of rare-earth elements if light rare earths occurred in the sample. Results are also given for spectrophotometric determination of La, Ce and Nd with I plus cationic surfactant and II. The flow injection method was applied in the analysis of oxide concentrates and apatites with good results.
Metals, rare earth Cerium Dysprosium Europium Lanthanum Metals, lanthanides Neodymium Spectrophotometry Chelation