Patent ID: 11953479
Assignee: THE RESEARCH FOUNDATION FOR THE STATE UNIVERSITY OF NEW YORK
Field: Measurement (Instruments)
Classification: CPC G  C | IPC C  G

Claim 0:
1. A method of detecting a free sulfite in an aqueous analyte, comprising:
reacting a first amount of the free sulfite in the aqueous analyte, with a compound having a 4-(1H-pyrrol-2-yl)pyridine ligand structure to perform a first bleaching;
measuring a first optical absorption corresponding to the first bleaching of the compound having the 4-(1H-pyrrol-2-yl)pyridine;
adding a second amount of the free sulfite in the aqueous analyte with the compound having the 4-(1H-pyrrol-2-yl)pyridine after the first bleaching, to perform a second bleaching;
measuring a second optical absorption corresponding to the second bleaching of the 4-(1H-pyrrol-2-yl)pyridine; and
calculating the free sulfite concentration in the aqueous analyte based on the measured first optical absorption and the measured second optical absorption.