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• W2074366922 abstract "Abstract Chamber studies establish that oxygenated and polar organics such as carbonyls, dicarbonyls, hydroxy carbonyls, epoxy carbonyls, oxo acids, and hydroxy carboxylic acids are photooxidation products of biogenic and anthropogenic hydrocarbons. To date, with the exception of carbonyls and carboxylic acids, few studies report ambient measurements of oxygenated and polar organics because of a lack of suitable methodologies. Such measurements are critical to establish the accuracy of photochemical models that incorporate chamber data, and are formulated to devise strategies to improve air quality. Here, we demonstrate the power and utility of pentafluorobenzyl alcohol (PFBOH) to identify pentafluorobenzyl derivatives of oxygenated and polar organics. The PFBOH chemical ionization (CI) mass spectrum comprises three primary ions at m/z 181 (C 6 F 5 CH 2 ) + , 197 (C 6 F 5 CH 2 O) + , and 198 (C 6 F 5 CH 2 OH) +· . We report the presence of (M − H) + , (M) +· , (M + H) + , and (M + 181) + ions in the PFBOH mass spectra that create a unique pattern which facilitates molecular weight determinations. By conducting experiments in which the reagent ions were selected prior to reaction with the derivative molecules, we established that the m/z 181 reagent ion effects the formation of an (M + 181) + adduct ion. The data also suggest that the m/z 197 ion primarily affects proton addition reactions, and that the m/z 198 ion promotes charge exchange and hydride abstraction reactions. We establish the practicality and power of PFBOH to identify pentafluorobenzyl derivatives in this and previous work. The knowledge gained regarding ion/molecule reactions of PFBOH chemical ionization (CI) was utilized to identify a pentafluorobenzyl derivative in an extract of fine particulate matter of diesel motor vehicle exhaust in a traffic tunnel. The combination of pentafluorobenzyl derivatization, PFBOH, and ion trap mass spectrometry assisted the identification of 4-hydroxybenzoic acid as a component of the particulate organic matter." @default.
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• W2074366922 date "1999-08-01" @default.
• W2074366922 modified "2023-09-23" @default.
• W2074366922 title "The power of pentafluorobenzyl alcohol chemical ionization/ion trap mass spectrometry to identify pentafluorobenzyl derivatives of oxygenated polar organics" @default.
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• W2074366922 doi "https://doi.org/10.1016/s1387-3806(99)00026-3" @default.
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