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Related Experiment Videos

X-ray microanalysis of pyroantimonate-precipitable cations.

J A Simson, H L Bank, S S Spicer

    Scanning Electron Microscopy
    |January 1, 1979
    PubMed
    Summary

    This study clarifies cation identification using the potassium (pyro)antimonate precipitation method. Energy-dispersive X-ray microanalysis confirms sodium, magnesium, and calcium precipitate antimonate under standard conditions.

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    Area of Science:

    • Cell Biology
    • Biochemistry
    • Microscopy

    Background:

    • The Komnick potassium (pyro)antimonate precipitation method is used for cation subcellular localization.
    • Identifying precipitated cations with this method has been challenging and controversial.

    Purpose of the Study:

    • To establish definitive criteria for identifying cations precipitated by the antimonate method.
    • To identify biologically important antimonate-precipitable cations in vitro.

    Main Methods:

    • Precipitation of antimonate salts in vitro.
    • Examination of precipitates using energy-dispersive X-ray microanalysis (EDX).
    • Analysis of crystalline powder and Epon-embedded samples.

    Main Results:

    • Sodium, magnesium, and calcium precipitate antimonate under standard conditions (2.5% antimonate, pH 7.2-7.4, 1% OsO4).
    • Characteristic X-ray emissions confirmed sodium, magnesium, and lead precipitates.
    • Antimony X-ray peaks complicated calcium identification, requiring deconvolution.

    Conclusions:

    • Standardized antimonate precipitates and their X-ray spectra aid in interpreting complex tissue sample spectra.
    • The study provides crucial criteria for accurate cation identification using antimonate precipitation.

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