---
id: '45'
doi: 'https://dx.doi.org/10.5194/acp-18-15535-2018'
publication_year: '2018'
first_author_name: 'Wang, D. S., Hildebrandt Ruiz, L.'
title: 'Chlorine-initiated oxidation of n-alkanes under high-NOx conditions: insights into secondary organic aerosol composition and volatility using a FIGAERO?CIMS'
journal_short_name: 'ACPD'
publisher: 'Copernicus'
abstract: "Chlorine-initiated oxidation of n-alkanes (C8?12) under high-nitrogen oxide conditions was investigated. Observed secondary organic aerosol yields (0.16 to 1.65) are higher than those for OH-initiated oxidation of C8?12 alkanes (0.04 to 0.35). A high-resolution time-of-flight chemical ionization mass spectrometer coupled to a Filter Inlet for Gases and AEROsols (FIGAERO?CIMS) was used to characterize the gas- and particle-phase molecular composition. Chlorinated organics were observed, which likely originated from chlorine addition to the double bond present on the heterogeneously produced dihydrofurans. A two dimensional thermogram representation was developed to visualize the\r\ncomposition and relative volatility of organic aerosol components using unit-mass resolution data. Evidence of oligomer formation and thermal decomposition was observed. Aerosol yield and oligomer formation were suppressed under humid\r\nconditions (35 % to 67 % RH) relative to dry conditions (under 5 % RH). The temperature at peak desorption signal, Tmax, a proxy for aerosol volatility, was shown to change with aerosol filter loading, which should be constrained when\r\nevaluating aerosol volatilities using the FIGAERO?CIMS. Results suggest that long-chain anthropogenic alkanes could contribute significantly to ambient aerosol loading over their atmospheric lifetime."
additional_notes: ''
user_id: '686'
publication_created_at: '2020-03-02 11:42:14'
publication_updated_at: '2020-03-02 11:42:14'

---
