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[Study on the determination of trace Cu and Mn in foodstuff preconcentration by precipitate flotation and FAAS]

Chun-xiang Li1, Ting-yu Chen, Yong-sheng Yan

  • 1Department of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, China.

Guang Pu Xue Yu Guang Pu Fen Xi = Guang Pu
|March 1, 2008
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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After filtration, the precipitate is washed to remove coprecipitated impurities and any remaining mother liquor. Colloidal precipitates, such as silver chloride, are washed with an electrolyte (such as dilute nitric acid) to prevent the peptization of the precipitate. In the case of slightly soluble precipitates, the wash solution contains a common ion to reduce solubility. Lead sulfate, which is slightly soluble in water, is washed with dilute sulfuric acid. Similarly, wash solutions may be...
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