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Personal sampler for NOx.

E D Palmes, C Tomczyk

    American Industrial Hygiene Association Journal
    |July 1, 1979
    PubMed
    Summary
    This summary is machine-generated.

    A new personal sampler accurately monitors nitrogen oxides (NOx) and nitrogen dioxide (NO2) in workplace air. This system uses a chromic acid disc to convert nitric oxide (NO) to NO2 for measurement.

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    Area of Science:

    • Environmental Science
    • Occupational Health
    • Analytical Chemistry

    Background:

    • Workplace air quality monitoring is crucial for occupational health.
    • Accurate measurement of nitrogen oxides (NOx) and nitrogen dioxide (NO2) is essential for assessing exposure risks.

    Purpose of the Study:

    • To develop and describe a personal sampler system for simultaneous monitoring of NOx and NO2 in workplace environments.
    • To enable the measurement of nitric oxide (NO) by difference between NOx and NO2 concentrations.

    Main Methods:

    • A personal sampler system was developed, building upon a previously reported NO2 sampler.
    • The NOx sampler incorporates a chromic acid impregnated disc to convert NO to NO2.
    • NO2 is trapped using triethanolamine, and both NO2 and trapped NO2 are determined colorimetrically as nitrite. NO is calculated by subtracting NO2 from NOx values.

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    Main Results:

    • The developed NOx sampler provides accurate and reproducible results.
    • Optimal performance is achieved when the chromic acid disc is in place for 24 hours or less, requiring timely insertion and removal.

    Conclusions:

    • The personal sampler system offers a viable method for monitoring workplace NOx and NO2 levels.
    • The operational requirement for disc management is considered a minor issue for users.