Nitrogen Dioxide Technical Data Sheet

Technical Data Sheet: TDS 1 DIF 100 RTU - NITROGEN DIOXIDE (NO2) This tube is designed for passively monitoring gaseous airborne Nitrogen dioxide. Description: Acrylic tube fitted with colored* and white thermoplastic rubber caps. The colored cap contains the absorbent. The concentrations of Nitrite ions and hence NO2 chemically adsorbed are quantitatively determined by UV/ Visible Spectrophotometry with reference to a calibration curve derived from the analysis of standard nitrite solutions (ISO Accredited Methods). Suitable for carrying out spatial or localized assessments for NO2 in ambient air or workplace monitoring. It can be used for co-location projects alongside an automatic analyzer to obtain bias correction factors. Tube Dimensions: 71.0mm length x 11.0mm internal diameter. Absorbent: Two preparations of Triethanolamine (TEA) absorbent are available: 20% Triethanolamine / De-ionized Water - *GREY CAP 50% Triethanolamine / Acetone – *RED CAP *Colors of the absorbent cap can be changed to suit customer requirements. Recommended Exposure Periods: 2 -4 weeks. Air Velocity: Influence of Wind Speed < 10% between 1.0 and 4.5 msec-1 (* based on original data). Storage: Store in a dark, cool environment preferably between 5-10°C. Shelf Life: 12 weeks from preparation date. Desorption Efficiency: d = 0.98 (determined using N.I.S.T. Standard Analytes). TDS 1:V1 March 2012 Limit of detection: 20%TEA/Water – less than 1.5 ugm-3 over a 4-week exposure period. Specific values available upon request. 50%TEA/Acetone – less than 2 ugm-3 over a 4-week exposure period. Specific values available upon request. Analytical Expanded Measurement Uncertainty: available upon request. Relevant Standards: BS EN 13528 Parts 1-3: 2002/3 Reference document: ED48673043 Issue-1A Feb 2008 – AEA Energy and Environment Special Factors: Potential interference from Nitrous Acid , Peroxy Acetyl Nitrate, which could increase levels of nitrate. TDS 1:V1 March 2012