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Empirical compensation for the precipitation effect in the measurement of gross alpha content in drinking water

Phineas Dickstein1, Lea Broshi, Gustavo Haquin

  • 1Quality Assurance and Reliability, Technion, Haifa, Israel. Dickstein@soreq.gov.il

Health Physics
|October 18, 2008
PubMed

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In determining nickel by gravimetric analysis, a precipitant of ethanolic dimethylglyoxime is added to a hot nickel salt solution. This is quickly followed by the dropwise addition of dilute ammonia solution until precipitation occurs. A...
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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.
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