cis-Pinonic Acid Oxidation by Hydroxyl Radicals in the Aqueous Phase under Acidic and Basic Conditions: Kinetics and Mechanism
PBN-AR
Instytucja
Wydział Chemii (Uniwersytet Warszawski)
Informacje podstawowe
Główny język publikacji
en
Czasopismo
Environmental Science & Technology (45pkt w roku publikacji)
ISSN
0013-936X
EISSN
1520-5851
Wydawca
AMER CHEMICAL SOC
DOI
URL
Rok publikacji
2017
Numer zeszytu
17
Strony od-do
9765-9773
Numer tomu
51
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Język
en
Treść
Aqueous-phase oxidation of cis-pinonic acid (CPA) by hydroxyl radicals (OH) was studied using a relative rate technique under acidic and basic conditions. Liquid chromatography (LC) coupled to the negative electrospray ionization (ESI) quadrupole tandem mass spectrometry (MS/ MS) was used to monitor the concentrations of CPA and reference compounds. The measured second order reaction rate coefficients of CPA with OH were: 3.6 ± 0.3 × 109 M−1 s−1 (pH 2) and 3.0 ± 0.3 × 109 M−1 s−1 (pH 10) - combined uncertainties are 2σ. These results indicated that the lifetimes of CPA in the atmosphere are most likely independent from the aqueous-phase pH. LC-ESI/MS/MS was also used to tentatively identify the CPA oxidation products. Formation of carboxylic acids with molecular weight (MW) 216 Da (most likely C10H16O5) and MW 214 Da (C10H14O5) was confirmed with LC-ESI/MS/MS. When the initial CPA concentration was increased from 0.3 to 10 mM, formation of additional products was observed with MW 188, 200, 204, and 232 Da. Hydroperoxy, hydroxyl and carbonyl-substituted CPA derivatives were tentatively identified among the products. Similar products were formed by the CPA oxidation by OH in the gas-phase, at the air−water interface as well as in the solid phase (dry film). Formation of the stable adduct of CPA and H2O2 was also observed when the reaction mixture was evaporated to dryness and redissolved in water. Acquired mass spectrometric data argues against formation of oligomers.
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Original article presents the results of original research or experiment.
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System-identifier
PX-5d1c83b4d5de54b6a0a5c80d
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