TY - JOUR
T1 - A method for extracting calibrated volatility information from the FIGAERO-HR-ToF-CIMS and its experimental application
AU - Bannan, Thomas J.
AU - Le Breton, Michael
AU - Priestley, Michael
AU - Worrall, Stephen D.
AU - Bacak, Asan
AU - Marsden, Nicholas A.
AU - Mehra, Archit
AU - Hammes, Julia
AU - Hallquist, Mattias
AU - Alfarra, M. Rami
AU - Krieger, Ulrich K.
AU - Reid, Jonathan P.
AU - Jayne, John
AU - Robinson, Wade
AU - McFiggans, Gordon
AU - Coe, Hugh
AU - Percival, Carl J.
AU - Topping, Dave
N1 - © Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
PY - 2019/3/5
Y1 - 2019/3/5
N2 - The Filter Inlet for Gases and AEROsols (FIGAERO) is an inlet specifically designed to be coupled with the Aerodyne High-Resolution Time-of-Flight Chemical Ionization Mass Spectrometer (HR-ToF-CIMS). The FIGAERO-HR-ToF-CIMS provides simultaneous molecular information relating to both the gas- and particle-phase samples and has been used to extract vapour pressures (VPs) of the compounds desorbing from the filter whilst giving quantitative concentrations in the particle phase. However, such extraction of vapour pressures of the measured particle-phase components requires use of appropriate, well-defined, reference compounds. Vapour pressures for the homologous series of polyethylene glycols (PEG) ((H-(O-CH2CH2)n-OH) for n = 3 to n = 8), covering a range of vapour pressures (VP) (10-1 to 10-7 Pa) that are atmospherically relevant, have been shown to be reproduced well by a range of different techniques, including Knudsen Effusion Mass Spectrometry (KEMS). This is the first homologous series of compounds for which a number of vapour pressure measurement techniques have been found to be in agreement, indicating the utility as a calibration standard, providing an ideal set of benchmark compounds for accurate characterization of the FIGAERO for extracting vapour pressure of measured compounds in chambers and the real atmosphere. To demonstrate this, single-component and mixture vapour pressure measurements are made using two FIGAERO-HR-ToF-CIMS instruments based on a new calibration determined from the PEG series. VP values extracted from both instruments agree well with those measured by KEMS and reported values from literature, validating this approach for extracting VP data from the FIGAERO. This method is then applied to chamber measurements, and the vapour pressures of known products are estimated.
AB - The Filter Inlet for Gases and AEROsols (FIGAERO) is an inlet specifically designed to be coupled with the Aerodyne High-Resolution Time-of-Flight Chemical Ionization Mass Spectrometer (HR-ToF-CIMS). The FIGAERO-HR-ToF-CIMS provides simultaneous molecular information relating to both the gas- and particle-phase samples and has been used to extract vapour pressures (VPs) of the compounds desorbing from the filter whilst giving quantitative concentrations in the particle phase. However, such extraction of vapour pressures of the measured particle-phase components requires use of appropriate, well-defined, reference compounds. Vapour pressures for the homologous series of polyethylene glycols (PEG) ((H-(O-CH2CH2)n-OH) for n = 3 to n = 8), covering a range of vapour pressures (VP) (10-1 to 10-7 Pa) that are atmospherically relevant, have been shown to be reproduced well by a range of different techniques, including Knudsen Effusion Mass Spectrometry (KEMS). This is the first homologous series of compounds for which a number of vapour pressure measurement techniques have been found to be in agreement, indicating the utility as a calibration standard, providing an ideal set of benchmark compounds for accurate characterization of the FIGAERO for extracting vapour pressure of measured compounds in chambers and the real atmosphere. To demonstrate this, single-component and mixture vapour pressure measurements are made using two FIGAERO-HR-ToF-CIMS instruments based on a new calibration determined from the PEG series. VP values extracted from both instruments agree well with those measured by KEMS and reported values from literature, validating this approach for extracting VP data from the FIGAERO. This method is then applied to chamber measurements, and the vapour pressures of known products are estimated.
UR - http://www.scopus.com/inward/record.url?scp=85062620018&partnerID=8YFLogxK
UR - https://www.atmos-meas-tech.net/12/1429/2019/
U2 - 10.5194/amt-12-1429-2019
DO - 10.5194/amt-12-1429-2019
M3 - Article
AN - SCOPUS:85062620018
SN - 1867-1381
VL - 12
SP - 1429
EP - 1439
JO - Atmospheric Measurement Techniques
JF - Atmospheric Measurement Techniques
IS - 3
ER -