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Direct determination of brucine by square wave voltammetry on 4-amino-2-mercaptopyrimidine self-assembled monolayer

Xiu-Hua Zhang1, Sheng-Fu Wang, Ni-Juan Sun

  • 1Faculty of Chemistry and Material Science, Hubei University, Wuhan 430062, People's Republic of China.

Bioelectrochemistry (Amsterdam, Netherlands)
|November 4, 2004
PubMed

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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.
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