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 18:
19. A method of determining a free sulfite concentration in an aqueous analyte, comprising:
providing 4-(1H-pyrrol-2-yl)pyridine,
adding a first amount of the aqueous analyte to the 4-(1H-pyrrol-2-yl)pyridine, and measuring a first bleaching of an optical absorption of the 4-(1H-pyrrol-2-yl)pyridine;
adding a second amount of the aqueous analyte to the 4-(1H-pyrrol-2-yl)pyridine after the first bleaching, and measuring a second bleaching of an optical absorption of the 4-(1H-pyrrol-2-yl)pyridine, and
calculating the free sulfite concentration in the aqueous analyte based on at least the second bleaching.