Determination of gaseous acidic compounds by measuring fluorescence after their reaction with tetra-substituted amino aluminum phthalocyanine.

Overview

Based on the fluorescence enhancement of a red-region fluorescent dye, tetrasubstituted amino aluminum phthalocyanine (TAAlPc), in strongly acidic medium, a new method was developed for the detection of four strong acids (HCl, HBr, HNO(3) and H(2)SO(4)). Under optimal conditions the linear ranges of the calibration curves were 0.04-0.67 mol/l (HCl), 0.04-0.67 mol/l (HBr), 0.04-0.80 mol/l (HNO(3)) and 0.02-0.80 mol/l (H(2)SO(4)), respectively. The detection limits were 0.007 mol/l for HCl, 0.006 mol/l for HBr, 0.005 mol/l for HNO(3) and 0.007 mol/l H(2)SO(4.) This method has been applied to the analyses of four artificial samples with satisfactory results.