Innovative cryogen-free monitoring of volatile toxic compounds in ambient air in compliance with Chinese EPA Method HJ 759
Application Note 149
This application note describes the sampling and analysis of toxic volatile organic compounds in ambient air. Compounds were analysed from humidified canisters using a cryogen-free thermal desorption system and GC–MS. Detection of 70 target compounds ranging in volatility from propene to naphthalene and including thermally labile compounds such as methyl mercaptan is demonstrated with excellent peak shape and superb analytical performance well within the criteria set out in Chinese EPA Method HJ 759.
The use of Markes’ ground-breaking Dry-Focus3™ preconcentration and water management technology results in excellent chromatographic peak shape at 100% humidity, full transfer of reactive sulfur compounds and an average method detection limit of 0.104 mg/m3.