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Fluorometric determination of total and bound sulfite in wine by N-(9-acridinyl)maleimide

K Akasaka1, H Ohrui, H Meguro

  • 1Tohoku University, Faculty of Agriculture, Sendai, Japan.

Journal of AOAC International
|November 1, 1993
PubMed

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Precipitation Titration: Endpoint Detection Methods01:19

Precipitation Titration: Endpoint Detection Methods

In argentometric precipitation titrations, endpoints can be detected visually by the Mohr, Volhard, and Fajans methods. In the Mohr method, adding a soluble chromate indicator gives an initial yellow color to the analyte solution. As the titrant is added, the first excess of silver ions forms a red silver chromate precipitate, marking the endpoint. The solution pH should be maintained at about 8 by adding solid CaCO3.
In the Volhard method, a standard excess of AgNO3 is first added to the...