Pyridine-2-carbaldehyde derivative of Girard-P as a fluorimetric reagent for the determination of gallium in aluminium

Abstract

A fluorimetric method for the determination of gallium, based on the formation of a fluorescent 1 : 1 chelate with PAHP (the pyridine-2-carbaldehyde derivative of Girard-P), is described. In aqueous solution, the fluorescent species has excitation and emission maxima at 388 and 442 nm, respectively, and the calibration graph is linear over the range 10–500 p.p.b. at pH 3.7. The method has been employed for the determination of gallium in aluminium.