BS 1747-9:1987

National foreword
Committees responsible
Method
1 Scope and field of application
2 References
3 Principle
4 Reactions
5 Apparatus
6 Procedure
7 Expression of results
8 Test report
Annex
      Typical performance characteristics
Figures
1(a) Schematic representation of a dual type
      chemiluminescence analyser (two reaction chambers
      and photomultipliers)
1(b) Schematic representation of a dual type
      chemiluminescence analyser utilizing a double
      reaction chamber and one photomultiplier
1(c) Schematic representation of a cyclic type
      chemiluminescence analyser
2 Schematic representation of arrangement for
      checking analyser converter efficiency
3 Schematic representation of a typical calibration
      system using a nitrogen dioxide permeation cell

Applicable to the measurement of NO up to a concentration of 12.5 mg/m³ and of NO₂ up to 19 mg/m³ at 25°C and 101.3 kPa.

This International Standard specifies a chemiluminescence method for the determination of the mass concentration of nitrogen oxides present in ambient air.

The method is applicable to the determination of the mass concentration of nitrogen monoxide present in ambient air up to approximately 12,5 mg/m³ and of nitrogen dioxide up to approximately 19 mg/m³ respectively¹⁾ at 25 °C and 101,3 kPa.

For interferents, see 6.6.

¹⁾ At the temperature and pressure given, the following conversion factors apply.