ISO 15337:2009 PDF

Ambient air — Gas phase titration — Calibration of analysers for ozone

Название (английский):

ISO 15337:2009

Ambient air — Gas phase titration — Calibration of analysers for ozone

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 14
Дата публикации:: 3 апреля 2009 г.
Издание:: ISO IS 15337 edition 1 version 1
ICS:: 13.040.20

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Описание (английский):

ISO 15337:2009 specifies the gas phase titration (GPT) method for the calibration of ambient air ozone (O3) analysers. The method is applicable to the calibration of O3 concentrations in the range 10 µg m−3 (5 nmol mol−1 mole fraction) to 2 000 µg m−3 (1 000 nmol mol−1 mole fraction). ISO 15337:2009 uses the reference conditions of 25 °C and 101,325 kPa; however, reference temperatures of 0 °C and 20 °C are also acceptable.

Технические детали

Технический комитет: ISO/TC 146/SC 3 - Ambient atmospheres
SKU: ISO 15337:2009

Abstract

Overview

ISO 15337:2009 specifies the gas phase titration (GPT) method for the calibration of ambient air ozone (O3) analysers. The standard defines a traceable secondary calibration technique that titrates ozone with excess nitric oxide (NO) and measures the NO decrease using a chemiluminescence analyser. ISO 15337:2009 covers O3 calibration concentrations from 10 µg m−3 (≈5 nmol·mol−1) to 2 000 µg m−3 (≈1 000 nmol·mol−1) and uses reference conditions of 25 °C and 101 325 kPa (0 °C and 20 °C are also acceptable).

Key topics and requirements

Principle: GPT is based on the bimolecular reaction NO + O3 → NO2 + O2. The molar decrease in NO equals the ozone added (stoichiometric titration).
Traceability: O3 calibration gases are traceable to a certified NO measurement standard (compressed gas cylinder) and to primary standards through the NO analyser.
Required equipment:
- O3 generator (stable output, UV lamps commonly used)
- Chemiluminescence NO analyser (meets ISO 7996 requirements)
- Reaction and dilution chambers made of inert materials (PFA, PTFE, borosilicate glass)
- Gas flow controllers or meters (electronic mass flow controllers recommended)
- Zero reference gas (synthetic air, O2 ≈ 20.9 % ±2 %)
- Temperature and pressure sensors for reference condition corrections
Procedure essentials:
- Generate known NO concentration and measure initial NO
- Add O3 to titrate NO; calculate reacted O3 from NO decrease
- Dilute and deliver calibration ozone to the O3 analyser via output manifold
- Use at least five O3 levels spanning the calibration range and perform linear least squares to obtain slope/intercept and uncertainties
Performance: The method provides high precision; the standard indicates measurement precision expected to be **

Overview

Key topics and requirements

Principle: GPT is based on the bimolecular reaction NO + O3 → NO2 + O2. The molar decrease in NO equals the ozone added (stoichiometric titration).
Traceability: O3 calibration gases are traceable to a certified NO measurement standard (compressed gas cylinder) and to primary standards through the NO analyser.
Required equipment:
- O3 generator (stable output, UV lamps commonly used)
- Chemiluminescence NO analyser (meets ISO 7996 requirements)
- Reaction and dilution chambers made of inert materials (PFA, PTFE, borosilicate glass)
- Gas flow controllers or meters (electronic mass flow controllers recommended)
- Zero reference gas (synthetic air, O2 ≈ 20.9 % ±2 %)
- Temperature and pressure sensors for reference condition corrections
Procedure essentials:
- Generate known NO concentration and measure initial NO
- Add O3 to titrate NO; calculate reacted O3 from NO decrease
- Dilute and deliver calibration ozone to the O3 analyser via output manifold
- Use at least five O3 levels spanning the calibration range and perform linear least squares to obtain slope/intercept and uncertainties
Performance: The method provides high precision; the standard indicates measurement precision expected to be **

ISO 15337:2009 PDF

Технические детали

Abstract

Overview

Key topics and requirements

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Abstract

Overview

Key topics and requirements

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