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[Determining the content of trace element in Potentilla parvifolia Fisch at different altitudes]

Chen Chen1, Xiao-hui Zhao, Xing-wang Zhang

  • 1Northwest Institute of Plateau Biology, Chinese Academy of Sciences, Xining 810008, China. chenchen19841014@163.com

Guang Pu Xue Yu Guang Pu Fen Xi = Guang Pu
|February 3, 2011
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.
In the Volhard method, a standard excess of AgNO3 is first added to the...