Spectrophotometric Determination of Al(III) in Environment Water with p-Carboxyarsenazo

Spectrophotometry determination of Al (III) with new color reagent p-Carboxyarsenazo(CAA) was reported, and the chromomeric reaction between CAA and Al (III) was studied. In a buffer medium of pH=4.6 HAc-NaAc, CAA reacts with Al (III) to form a red complex and exhibits an absorption maxima at 614nm; Beer,s law is obeyed for 0.10~0.80 μg/mL of Alumium in color solution, the color reaction exhibited high sensitivity (the apparent molar absorptivity obtained is 1.61×104 L/(mol.cm)), and the absorbance fit linear regression equation is A=0.0105+0.561X(μg/mL), the correlation coefficient is 0.9998, the detection limit of the method is 0.36 μg/L. The results obtained by this method in the determination of environment water samples were rapid, accurate and satisfactorily.