A method for extracting calibrated volatility information from the FIGAERO-HR-ToF-CIMS and its experimental application

被引:41
作者
Bannan, Thomas J. [1 ]
Le Breton, Michael [2 ]
Priestley, Michael [1 ]
Worrall, Stephen D. [1 ,8 ]
Bacak, Asan [1 ]
Marsden, Nicholas A. [1 ]
Mehra, Archit [1 ]
Hammes, Julia [2 ]
Hallquist, Mattias [2 ]
Alfarra, M. Rami [1 ,3 ]
Krieger, Ulrich K. [4 ]
Reid, Jonathan P. [5 ]
Jayne, John [6 ]
Robinson, Wade [6 ]
McFiggans, Gordon [1 ]
Coe, Hugh [1 ]
Percival, Carl J. [1 ,7 ]
Topping, Dave [1 ]
机构
[1] Univ Manchester, Ctr Atmospher Sci, Sch Earth & Environm Sci, Oxford Rd, Manchester M13 9PL, Lancs, England
[2] Univ Gothenburg, Dept Chem & Mol Biol, Gothenburg, Sweden
[3] Natl Ctr Atmosphere Sci, Manchester, Lancs, England
[4] Swiss Fed Inst Technol, Inst Atmospher & Climate Sci, CH-8092 Zurich, Switzerland
[5] Univ Bristol, Sch Chem, Bristol BS8 1TS, Avon, England
[6] Aerodyne Res Inc, 45 Manning Rd, Billerica, MA 01821 USA
[7] Jet Prop Lab, 4800 Oak Grove Dr, Pasadena, CA 91109 USA
[8] Univ Manchester, Sch Mat, Oxford Rd, Manchester M13 9PL, Lancs, England
关键词
SATURATION VAPOR-PRESSURES; SECONDARY ORGANIC AEROSOL; MASS-SPECTROMETER; ALPHA-PINENE; MOLECULAR COMPOSITION; DICARBOXYLIC-ACIDS; EVAPORATION RATES; KNUDSEN EFFUSION; SOA FORMATION; WATER-UPTAKE;
D O I
10.5194/amt-12-1429-2019
中图分类号
P4 [大气科学(气象学)];
学科分类号
0706 ; 070601 ;
摘要
The Filter Inlet for Gases and AEROsols (FI-GAERO) 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-CH2-CH2)(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.
引用
收藏
页码:1429 / 1439
页数:11
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