Alummmm was determined m a flow-llyection system mvolvmg the formation of the alummmmUII)-l,Zdihydroxyanthraqumone-3-sulphomc acid (DASA) complex at pH 9 0 and amperometrlc measurement of excess of DASA at +0 50 V on a gold electrode Electrode fouhng by adsorption of DASA oxldatlon products was mmumzed by use of a double pumpmg system to provide a reagent cycle and a wash cycle During the wash cycle the gold electrode surface was reactivated electrochemically by cathodic-anodic voltage cychng The hnear workmg range was governed by the DASA concentration For 2 x 10e5, 5 x 10m5 and 5 x 10e4 M DASA the hnear ranges were (0 05-l 0) X lo-', (0 l-2 2) x 10e5 and (0 l-l 2) X 10e4 M Al(III), respectwely
The detectIon hnut when using 2 X 10m5 M DASA was 2 5 x 10e7 M Al(III) and the R S D for 9 x 10W6 M Al(W) was 4 3% (n = 6) Nitnlotnacetic aad, tannins and Fe(III) interfered, no interference was observed with F-, PO:-, citnc, oxalic and fulvrc acids, Mg2+ or Ca2+ The method was applied to the determmation of Al(II1) m soil extracts