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Related Experiment Videos

Direct complexometric titration of calcium phosphates

M M Tuckerman, M E Sanchez de Ramos

    Journal of Pharmaceutical Sciences
    |September 1, 1977
    PubMed
    Summary

    This study presents a method for determining calcium in calcium phosphate samples using a specific titration technique. Optimizing the addition of a complexing agent before pH adjustment saves time and prevents precipitate formation during analysis.

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    Area of Science:

    • Analytical Chemistry
    • Inorganic Chemistry

    Background:

    • Accurate determination of calcium is crucial for characterizing calcium phosphate materials.
    • Traditional titration methods can be time-consuming and prone to precipitate formation.

    Purpose of the Study:

    • To optimize the titration method for calcium determination in calcium phosphate samples.
    • To improve efficiency and prevent precipitate formation during analysis.

    Main Methods:

    • Dissolving calcium phosphate samples in hydrochloric acid.
    • Using hydroxynaphthol blue indicator and triethanolamine.
    • Adjusting pH to 12.3-12.5 with potassium hydroxide.
    • Titrating with disodium ethylenediaminetetraacetate solution.

    Main Results:

    • A modified procedure involving pre-addition of the complexing agent significantly reduces analysis time.
    • The optimized method avoids the formation of precipitates, simplifying the titration process.
    • Accurate calcium quantification was achieved in calcium phosphate samples.

    Conclusions:

    • The optimized titration method offers a more efficient and reliable approach for calcium determination.
    • Pre-adding the complexing agent is key to improving the practicality of this analytical technique.

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