Determination of submicrogram amounts of gallium by ion-exchanger fluorimetry Determination of gallium in natural waters.
A method for microdetermination of gallium at ng/ml level has been developed, based on ion-exchanger fluorimetry. The gallium reacts with salicylidene-o-aminophenol to give a highly fluorescent complex, which is fixed on a dextran-type cationic resin. The fluorescence of the resin, packed in a 1-mm silica cell, is measured directly with a solid-surface attachment. The range of concentration of the method is 2.0-10.0 ng/ml, the RSD 1.3% and the detection limit 0.3 ng/ml. The method has been applied to the determination of gallium in natural waters. The gallium content found in tap water was higher than that in raw water. This is related to the use of commercial aluminium salts in the water-treatment plant.
Capitan
F
F
Department of Analytical Chemistry, University of Granada, 18071-Granada, Spain.
Navalon
A
A
Vilchez
J L
JL
Capitan-Vallvey
L F
LF