Ground-based intercomparison of two isoprene measurement techniques

[摘要] An informal intercomparison of two isoprene(C₅H₈) measurement techniques was carried out during Fall of 1998 at a field site locatedapproximately 3 km west of Boulder, Colorado, USA. A new chemical ionizationmass spectrometric technique (CIMS) was compared to a well-established gaschromatographic technique (GC). The CIMS technique utilized benzene cationchemistry to ionize isoprene. The isoprene levels measured by the CIMS wereoften larger than those obtained with the GC. The results indicate that theCIMS technique suffered from an anthropogenic interference associated withair masses from the Denver, CO metropolitan area as well as an additional interference occurring in clean conditions. However, the CIMS technique isalso demonstrated to be sensitive and fast. Especially after introduction ofa tandem mass spectrometric technique, it is therefore a candidate for isoprene measurements in remote environments near isoprene sources.

[学科分类] 大气科学