STUDY OF ABSORBENCY OF THE ALUMINUM CHROME AZUROL S-COMPLEX IN SOLUTION

The reaction between aluminum(III) and Chrome Azurol S (GAS) at pH 5 w as reinvestigated. It was shown that the optical properties of the com plex permit trace amounts of aluminum in water from a coalmine well to be determined sensitively and accurately. It was found that the ordin ary spectrophotometric method gives no satisfactory results. The beta- correction principle and the updated theory can be applied to determin ing the characteristic parameters of the chelate. The molar absorptivi ty and the instability constant of the chelate were evaluated. The res ults showed that the dependence of the absorbance at 620 mm on the Al concentration is described well by a logarithmic function; however the corrected absorbance at 580 nm is a Linear function of the element co ncentration. The analysis of minewell waters showed that the recovery of Al was 92-110% (at 620 nm) and 92-107% (at 580 nm), and the relativ e standard deviation was less than 4.5% (at 620 nm) and 2.4% (at 580 n m).