The effect of HNO(3), HCl and HBr on the fluorescence of the aluminium complex of 1-(2-pyridylazo)-2-naphthol and an improved fluorometric procedure for determination of aluminium.
The fluorescence of the aluminium complex of 1-(2-pyridylazo)-2-naphthol (PAN) is both stabilized and enhanced by 10(-3)M HNO(3) . HCl or HBr. Other acids tested have no effect. An improved flourometric procedure with a detection limit of 0.001 ppm, increased precision and reduced interferences over the existing Al-PAN method is described. It is satisfactory for the determination of aluminium in bronze when an ion-exchange separation is used, but is not suitable for the determination of aluminium in plants. The acidified Al-PAN is unsuitable for the determination of nickel(II) and fluoride by fluorescence quenching.
Haddad
P R
PR
Department of Analytical Chemistry, University of New South Wales, P.O. Box 1, Kensington, N.S.W., Australia 2033.
Alexander
P W
PW
Smythe
L E
LE