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D5110-22 – Standard Test Method Technical Guide
🔬 Principle and Scope of the UV Photometric Method
ASTM D5110 – 22a provides a standardized methodology for calibrating ozone monitors used in ambient, workplace, and indoor air quality monitoring. It also establishes the protocol for certifying transfer standards for this purpose. The core principle is the photometric assay of ozone (O3) concentrations in a dynamic flow system.
Concentration is determined by measuring the absorption of 253.7 nm ultraviolet light. An accurate determination requires knowledge of three parameters: (1) the absorption coefficient of O3 at 253.7 nm, (2) the optical path length through the absorption cell, and (3) the transmittance of the sample. Values are stated in SI units.
⚠️ Safety Warning: This standard does not address all safety concerns. Users must establish appropriate safety practices and determine regulatory applicability. Refer to Section 8 for specific precautionary statements.
📊 Standard Classification and Terminology
D5110-22a defines a hierarchy of standards to ensure traceability. The following formal definitions provide a consistent framework for ozone calibration.
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