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Related Experiment Videos

Rapid seven-hour fecal coliform test.

D J Reasoner, J C Blannon, E E Geldreich

    Applied and Environmental Microbiology
    |August 1, 1979
    PubMed
    Summary

    A new 7-hour test accurately detects fecal coliforms (FC) in water using a specialized medium. This rapid method is suitable for surface waters and wastewater, offering a quick alternative to traditional 24-hour tests.

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    Letters in applied microbiology·1996

    Area of Science:

    • Environmental microbiology
    • Water quality analysis
    • Microbial detection methods

    Background:

    • Traditional fecal coliform (FC) testing requires 24 hours, delaying crucial water quality assessments.
    • There is a need for rapid methods to detect fecal contamination in various water sources.

    Purpose of the Study:

    • To develop and evaluate a rapid 7-hour test for fecal coliform detection in water.
    • To assess the accuracy and suitability of the rapid test for different water types.

    Main Methods:

    • A membrane filter technique using a buffered lactose-based medium (m-7-h FC medium) with a pH indicator.
    • Incubation at 41.5°C for 7 to 7.25 hours.
    • Comparison of 7-hour test results with standard 24-hour fecal coliform counts.

    Main Results:

    • The 7-hour test yielded results comparable to 24-hour tests for surface waters (mean ratio 1.08).
    • The test showed higher counts in unchlorinated wastewater (ratios 1.95-5.05), indicating its sensitivity.
    • Verification of colonies was high (average 97%), and field tests showed good agreement with standard methods (96% of 24-h counts).

    Conclusions:

    • The 7-hour fecal coliform test is a reliable and rapid method for water quality monitoring.
    • It is suitable for examining surface waters and unchlorinated sewage.
    • The test can serve as an emergency tool for detecting fecal contamination in potable water.

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