GB/T 15438-1995 in English
SUPERSEDEDAmbient air--Determination of ozone--Ultraviolet photometric method
- Issued on:1995-01-04
- Implemented on:1995-08-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
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《GB/T 15438-1995环境空气 臭氧的测定 紫外光度法》由467（生态环境部）归口，主管部门为生态环境部。
本标准规定了测定环境空气中臭氧的紫外光度法。本标准规定了在测定条件25℃和101.325kPa时，臭氧的测定范围为2.14μg/m?3（0.001ppm?V/V?）至2mg/m 3（1ppm?V/V?）。
Introduction
GB/T 15438-1995 Standard Overview
This standard specifies the ultraviolet photometric method for determining ozone in ambient air, applicable to the determination of ozone concentration in the range of $2.14~\mu\mathbf{g}/\mathbf{m}^3$ to $2~\mathbf{mg}/\mathbf{m}^3$ under the conditions of $25\,^\circ\text{C}$ and $101.325~\mathbf{kPa}$. This method is not applicable to environments with particle concentrations exceeding $100~\mu\mathbf{g}/\mathbf{m}^3$.
Comparison of Standard Frameworks
| Chapter Contents | Main Contents | Scope of Application |
|---|---|---|
| 1. Subject Content and Scope of Application | Specifies the method and applicable conditions for determining ozone by ultraviolet photometry | All ambient air monitoring scenarios |
| 2. Terminology | Defines key terms such as zero air and transfer standard | Professional terminology specifications in the ozone determination process |
| 3. Principle | Based on the Lambert-Beer law, ozone concentration is measured using the ultraviolet absorption characteristics | Optical analysis field |
| 4. Reagents and Materials | Specifies requirements for sampling pipelines, filter membranes, zero air, etc. | Experimental condition control |
Instrument and technical requirements
UV ozone analyzer is the core equipment and must meet the following conditions:
- The absorption cell material is inert, with a loss rate of $\leq 5\%$
- The UV lamp wavelength is $254~\mathsf{nm}$ and the radiation accounts for $\geq 99.5\%$
- The sensitivity of the light detector: the standard deviation does not exceed $3\%$ of the concentration or $0.01~\mathbf{mg}/\mathbf{m}^3$
Implementation Advice
Calibration Procedure:
- Preheat system $48~\mathsf{h}$
- Zero Calibration: Use zero air to adjust response
- Span Calibration: Adjust analyzer at full scale conditions
- Multi-point Calibration: Verify with at least $5$ ozone concentrations
Operational Advice:
- Check zero/span and operating parameters weekly
- Perform multi-point calibration quarterly
- Ensure sample lines and filters meet inertness requirements
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