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Optical fiber based methodology for assessment of thiocyanate in seawater

Lurdes I B Silva1, Celine I L Justino, Isabel Lopes

  • 1CESAM & Department of Chemistry, University of Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal. lisilva@ua.pt

Journal of Environmental Monitoring : JEM
|April 16, 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...