Fluorimetric determination of sulfite by the co-quenching effect of formaldehyde and sulfite on the fluorescence of tetra-substituted amino aluminum phthalocyanine
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A spectrofluorimetric determination of sulfite based on the co-quenching effect of sulfite and formaldehyde on the fluorescence of a red-region dye, tetra-substituted amino aluminum phthalocyanine (TAAlPc), is described. The relationship between the fluorescence quenching of TAAlPc and the concentration of sulfite is linear over the concentration range of 8-240 ng ml(-1) under optimum conditions. The 3 sigma limit of detection is 3 ng ml(-1) and the relative standard deviation of six replicate measurements is 3.5% for solution containing a 160 ng ml(-1) sulfite. The possible reaction mechanism is also discussed. This method has been successfully applied to the determination of sulfite in VK3 injections and sugar. (C) 2001 Elsevier Science B.V All rights reserved.