Hanna-instruments HI 84500 Manual do Utilizador descarregar pdf (Página 6)

PRINCIPLE OF OPERATION

The HI 84500 determines the free and total sulfur dioxide concentration in wine using the Ripper

method. Excess iodide added to the wine sample reacts with iodate introduced by the titrant to

produce iodine.

+ 5I

+ 6H

→ 3I

+ 3H

The iodine produced in the sample then reacts with sulfur dioxide in the wine according to the redox

reaction below:

+ I

→ H

+ 2HI

The HI 84500 utilizes an ORP electrode to monitor the redox titration. The integrated algorithm

detects when the reaction is complete (equivalence point). The volume of titrant required to reach the

equivalence point, the titrant concentration and the sample size are used to calculate the sulfur

dioxide concentration in the wine sample.

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Hanna-instruments HI 84500 Manual do Utilizador Página 6