AS 2365.1.2-1990

1 - AS 2365.1.2-1990 METHODS FOR THE SAMPLING AND ANALYSIS OF INDOOR AIR - DETERMINATION OF NITROGEN DIOXIDE - SPECTROPHOTOMETRIC
1 - PREFACE
1 - CONTENTS
1 - METHOD
1 - 1 SCOPE.
1 - 2 APPLICATION.
2 - 3 REFERENCED DOCUMENTS.
2 - 4 PRINCIPLE.
2 - 5 DEFINITION.
2 - 6 REAGENTS AND MATERIALS.
2 - 6.1 General requirements.
2 - 6.2 Sodium nitrite solution.
2 - 6.3 Triethanolamine solution.
2 - 6.4 Azo dye-forming reagent.
2 - 6.5 Standard dye solution.
2 - 6.6 Reference gas.
2 - 6.7 Diluent gas.
2 - 7 APPARATUS.
2 - 7.1 Passive sampling badge (see Figure 1)
3 - 7.2 Spectrophotometer
3 - 7.3 Chemiluminescence nitrogen dioxide analyser
3 - 7.4 Drying oven
3 - 7.5 Gas mixing manifold
3 - 8 PREPARATION OF PASSIVE SAMPLING BADGES.
3 - 9 SAMPLING.
4 - 10 PROCEDURE.
4 - 10.1 Calibration graph.
4 - 10.2 Calibration constant.
5 - 10.3 Determination.
5 - 11 CALCULATION AND EXPRESSION OF RESULTS.
5 - 12 PRECISION.
6 - 13 TEST REPORT.
6 - 14 BIBLIOGRAPHY.

Sets out a spectrophotometric method for the determination of nitrogen dioxide in indoor air using a passive sampling treated filter technique. This method is applicable to indoor air in which the expected nitrogen dioxide concentration is within the range 0 to 3 ppm (V/V) (0 to 6000µg/m(sup)3(/sup)) for an exposure time of 1h, and has a detection limit of 0.35 ppm for a 2h sampling period.

This Standard sets out a spectrophotometric method for the determination of nitrogen dioxide in indoor air using a passive sampling, treated filter technique. This method is applicable to indoor air in which the expected nitrogen dioxide concentration is within the range 0 to 3 p.p.m. (V/V) (0 to 6 000 mg/m3) for an exposure time of 1 h, and has a detection limit of 0.035 p.p.m. for a 2 h sampling period.

First published as AS 2365.1.2-1990.