A new all-season passive sampling system for monitoring NO2 in air

✍ Scribed by Hongmao Tang; Thomas Lau; Bernie Brassard; Walter Cool

• Publisher: John Wiley and Sons
• Year: 1999
• Weight: 258 KB
• Volume: 3
• Category: Article
• ISSN: 1086-900X
• DOI: 10.1002/(sici)1520-6521(1999)3:6<338::aid-fact3>3.0.co;2-u

✦ Synopsis

A new all-season passive sampling system for monitoring NO 2 in air has been developed. This passive sampling system employs the same approach as the allseason sampling system for monitoring SO 2 reported in FACT [Vol. 1(5), 1997] before, but a new collection medium (CHEMIXீ) for sampling NO 2 has been developed and is used. Compared to the existing collection media used for NO 2 passive samplers, such as a triethanolamine (TEA)-coated cellulose fiber filter, CHEMIXீ is less affected by temperature and relative humidity, and has a higher sampling rate. This system has been extensively tested in the lab (temperature from ؊27 to 20 ؇C, relative humidity from 4 to 80%, and wind speed from 0.5 to 150 cm/s) and validated in the field in all climates. Comparing measurements obtained with the use of the new passive sampling system with equivalent measurements with the use of a continuous NO 2 analyzer yielded an accuracy of greater than 85%. The new NO 2 passive sampling system can be used to measure ambient NO 2 concentrations ranging from 0.1 to 50 ppb based on a 1month exposure period.