Nitrogen Dioxide

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 coloured* and white thermoplastic rubber caps. The coloured cap contains the absorbent with Triethanolamine. The concentrations of Nitrite ions and hence NO2 chemically adsorbed are quantitatively determined by U.V. / Visible Spectrophotometry with reference to a calibration curve derived from the analysis of standard nitrite solutions. 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 : Three types of Triethanolamine absorbent are available: 50% Triethanaolamine / DeIonised Water - * RED CAP 20% Triethanolamine / DeIonised Water - * GREY CAP 50% Triethanolamine / Acetone – *BLUE CAP Colours of the absorbent cap can be changed to suit customer requirements. Recommended Exposure Periods : 2 –4 weeks Uptake Rate : 72.0cm3 hr-1 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 degrees centigrade Shelf Life : 12 weeks from preparation date Desorption Efficiency : d = 0.98 ( determined using N.I.S.T. Standard Analytes) Analytical Expanded Measurement Uncertainty : +/- 3.69% L.O.D. : 0. 4ppb ( 0. 34ugm3) over a 2 week exposure period Relevant Standards : BS EN 13528 Parts 1-3 : 2002/3 BS EN 838 :1996 Special Factors : Potential interference from Nitrous Acid , Peroxy Acetyl Nitrate, which could increase levels of nitrate.