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Related Experiment Videos

Stability of sodium hypochlorite solutions

T M Fabian, S E Walker

    American Journal of Hospital Pharmacy
    |June 1, 1982
    PubMed
    Summary

    Diluted sodium hypochlorite solutions remain stable for extended periods. Stored in amber glass, these solutions are recommended to have a 23-month expiry date for optimal chemical stability.

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    Area of Science:

    • Chemistry
    • Materials Science

    Background:

    • Sodium hypochlorite solutions are widely used disinfectants.
    • Understanding the stability of diluted solutions is crucial for practical applications.

    Purpose of the Study:

    • To assess the chemical stability of diluted sodium hypochlorite solutions.
    • To determine an appropriate expiry date for stored solutions.

    Main Methods:

    • Sodium hypochlorite (1%) solutions were diluted (1:8, 1:12, 1:20) and stored in amber-glass bottles.
    • Samples were analyzed over six months using iodometric titration to determine available chlorine content.
    • Degradation rates were calculated using least-squares regression analysis.

    Main Results:

    • All dilutions exhibited negative degradation rates for available chlorine.
    • The fastest degradation rate was observed in the 1:12 dilution (-8.1 X 10^-6).
    • Estimated annual loss of available chlorine was 5.24%, maintaining over 90% concentration for 22.9 months.

    Conclusions:

    • Diluted sodium hypochlorite solutions demonstrate good chemical stability when stored in amber-glass bottles.
    • A 23-month expiry date is recommended for these solutions based on chemical stability.
    • Proper storage conditions are vital for maintaining the efficacy of sodium hypochlorite solutions.

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