Fibre-optic titrations-IV Direct complexometric titration of aluminium(III) with DCTA.
The end-point of the direct complexometric titration of Al(3+) in pH 4.6 solution can be determined by monitoring the fluorescence intensity of the aluminium-morin complex, by use of a bifurcated fibre-optic light guide. The method allows the determination of aluminium in the 1-800 ppm range with good precision. The procedure is applicable even when the solutions are strongly coloured or turbid, but because of the slow complexation kinetics requires a titration time of about 20 min.
Wolfbeis
O S
OS
Institute of Organic Chemistry, Karl-Franzens-University, 8010 Graz, Austria.
Schaffar
B P
BP
Chalmers
R A
RA