ISO 6768:1998 PDF
Ambient air — Determination of mass concentration of nitrogen dioxide — Modified Griess-Saltzman method
Ambient air — Determination of mass concentration of nitrogen dioxide — Modified Griess-Saltzman method
- Статус документа:
- Действующий
- Формат:
- Электронный (PDF)
- Количество страниц:
- 10
- Дата публикации:
- 23 июля 1998 г.
- Издание:
- ISO IS 6768 edition 2 version 1
- ICS:
- 13.040.20
Abstract
Overview
ISO 6768:1998 specifies a modified Griess–Saltzman colorimetric method for determination of the mass concentration of nitrogen dioxide (NO2) in ambient air. The method uses an azo‑dye formation reaction in an absorption solution and spectrophotometric measurement of the resulting pink colour (wavelength 540–550 nm). It is intended for ambient and confined‑space air monitoring and for analytical checking of calibration gas mixtures (see ). The method is not suitable for personal breathing‑zone sampling.
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