Tropospheric Chemistry: VOC Instruments

Organic Acid - Chemical Ionization Mass Spectrometer (Acid CIMS)

Decommissioned

Principle of the Measurement

Chemical ionization of organic acids by transfer with acetate ions
Detection using a quadrupole mass spectrometer

Species Measured

1. Mono and di-carboxylic acids

Time Response / Detection Limit

1-10 seconds / 10-100 pptv

Field Projects

• INDOEX 1999
• MINOS 2001
• ITCT 2002
• NEAQS 2002
• ICARTT 2004
• MILAGRO 2006
• TexAQS 2006
• BEARPEX 2007
• ARCPAC 2008
• ICEALOT 2008
• CalNex 2010
• NACHTT 2011
• BioCORN 2011
• SONNE 2012
• UBWOS 2012
• SENEX 2013

Key Publications

P. Veres, J.M. Roberts, C. Warneke, D. Welsh-Bon, M. Zahniser, S. Herndon, R. Fall and J. de Gouw, Development of negative-ion proton-transfer chemical-ionization mass spectrometry (NI-PT-CIMS) for the measurement of gas-phase organic acids in the atmosphere, International Journal of Mass Spectrometry, doi:10.1016/j.ijms.2008.04.032, 2008.