A thermal-dissociation–cavity ring-down spectrometer (TD-CRDS) for the detection of organic nitrates in gas and particle phases

Keehan, Natalie I.; Brownwood, Bellamy; Marsavin, Andrey; Day, Douglas A.; Fry, Juliane L.

A thermal-dissociation–cavity ring-down spectrometer (TD-CRDS) was developed to measure inline-formulaNO2, peroxy nitrates (PNs), alkyl nitrates (ANs), and inline-formulaHNO3 in the gas and particle phase, built using a commercial Los Gatos Research inline-formulaNO2 analyzer. The detection limit of the TD-CRDS is 0.66 ppb for ANs, PNs, and inline-formulaHNO3 and 0.48 ppb for inline-formulaNO2. For all four classes of inline-formulaNOy, the time resolution for separate gas and particle measurements is 8 min, and for total gas inline-formula+ particle measurements it is 3 min. The accuracy of the TD-CRDS was tested by comparison of inline-formulaNO2 measurements with a chemiluminescent inline-formulaNOx monitor and aerosol-phase ANs with an aerosol mass spectrometer (AMS). inline-formulaN2O5 causes significant interference in the PN and AN channel under high oxidant concentration chamber conditions, and ozone pyrolysis causes a negative interference in the inline-formulaHNO3 channel. Both interferences can be quantified and corrected for but must be considered when using TD techniques for measurements of organic nitrates. This instrument has been successfully deployed for chamber measurements at widely varying concentrations, as well as ambient measurements of inline-formulaNOy.

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Keehan, Natalie I. / Brownwood, Bellamy / Marsavin, Andrey / et al: A thermal-dissociation–cavity ring-down spectrometer (TD-CRDS) for the detection of organic nitrates in gas and particle phases. 2020. Copernicus Publications.

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Rechteinhaber: Natalie I. Keehan et al.

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