Sulfadimethoxine of Dye

Sulfadimethoxine is the intermediate matter of dye, and its concentration is measured according to JIS K 4101 1993.
The sample, first hydrochloric acidified is dissolved with potassium bromide, and is titrated with 0.5 mol/L sodium nitrite while maintaining temperature at 0 to 5 °C.
Titration is potentiometric, and the endpoint is determined by the maximum inflexion point on titration curve.
The concentration of sulfadimethoxine is calculated from titration volume of 0.5 mol/L sodium nitrite.

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