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

Based on the fluorescence enhancement of a red-region fluorescent dye, tetr asubtituted amino aluminum phthalocyanine (TAAlPc), in strongly acidic medi um, a new method was developed for the detection of four strong acids (HCl, HBr, HNO3 and H2SO4). Under optimal conditions the linear ranges of the ca libration curves were 0.04-0.67 mol/l (HCl), 0.03-0.67 mol/l (HBr), 0.04-0. 80 mol/l (HNO3) and 0.02-0.80 mol/l (H2SO4), respectively. The detection li mits were 0.007 mol/l for HCl, 0.006 mol/l for HBr, 0.005 mol/l for HNO3 an d 0.007 mol/l H2SO4. This method has been applied to the analyses of four a rtificial samples with satisfactory results. (C) 1999 Published by Elsevier Science B.V. All rights reserved.