Rapid and high-precision cavity-enhanced spectroscopic measurement of HONO and NO2: Application to emissions from heavy-duty diesel vehicles in chassis dynamometer tests and in mobile monitoring

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dc.check.date2026-12-16en
dc.check.infoAccess to this article is restricted until 24 months after publication by request of the publisheren
dc.contributor.authorWang, Mengen
dc.contributor.authorLiu, Wenyangen
dc.contributor.authorDing, Xiangen
dc.contributor.authorLiu, Taoen
dc.contributor.authorZhou, Wenxinen
dc.contributor.authorLou, Shengrongen
dc.contributor.authorVenables, Dean S.en
dc.contributor.authorVarma, Ravien
dc.contributor.authorHuang, Chengen
dc.contributor.authorChen, Junen
dc.contributor.funderNational Natural Science Foundation of Chinaen
dc.contributor.funderNational Key Research and Development Program of Chinaen
dc.contributor.funderScience Foundation Irelanden
dc.date.accessioned2025-01-14T11:18:21Z
dc.date.available2025-01-14T11:18:21Z
dc.date.issued2025-12-16en
dc.description.abstractNitrous acid (HONO) is crucial in atmospheric chemistry as it is a major precursor for hydroxyl radicals (OH), the dominant atmospheric oxidant. Hydroxyl radicals are essential in the formation of secondary air pollutants like ozone and particulate matter. This study presents a newly developed Incoherent Broadband Cavity Enhanced Absorption Spectroscopy (IBBCEAS) system for precise and rapid measurements of HONO and nitrogen dioxide (NO2) emissions. The instrument's optical cavity (formed by two mirrors separated by 96 cm and with reflectivity of 0.99955 at 378 nm) resulted in an effective optical path length of 1.4 km. With an integration time of 5 s, the 1σ measurement precisions for HONO and NO2 were 0.19 ppb and 0.48 ppb with overall measurement uncertainties of 10 % and 7 %, respectively. Comparative analysis of the IBBCEAS and a commercial cavity-attenuated phase shift (CAPS) systems under non-emission conditions demonstrated excellent agreement (slope = 1.01 and R2 = 0.98). The instrument was applied to study HONO and NO2 emissions from heavy-duty vehicles in chassis dynamometer tests and mobile monitoring. Chassis dynamometer tests revealed that HONO and NO2 emissions depend strongly on vehicle speed and driving conditions. We find a HONO/NOX ratio of 1.01 × 10−2 across the entire China-World Transient Vehicle Cycle (C-WTVC) driving cycle. Mobile monitoring in urban areas shows emission characteristics similar to those observed in chassis dynamometer tests. Frequent acceleration-deceleration patterns of diesel vehicles under congested traffic conditions lead to higher HONO and NO2 emissions compared to driving under steady speed conditions. Improving traffic flow conditions will help reduce HONO and NO2 emissions.en
dc.description.sponsorshipNational Natural Science Foundation of China (22176129); National Key Research and Development Program of China (2022YFE0137100)en
dc.description.statusPeer revieweden
dc.description.versionAccepted Versionen
dc.format.mimetypeapplication/pdfen
dc.identifier.articleid127386en
dc.identifier.citationWang, M., Liu, W., Ding, X., Liu, T., Zhou, W., Lou, S., Venables, D. S., Varma, R., Huang, C. and Chen, J. (2024) 'Rapid and high-precision cavity-enhanced spectroscopic measurement of HONO and NO2: Application to emissions from heavy-duty diesel vehicles in chassis dynamometer tests and in mobile monitoring', Talanta, 285, 127386 (11pp). https://doi.org/10.1016/j.talanta.2024.127386en
dc.identifier.doihttps://doi.org/10.1016/j.talanta.2024.127386en
dc.identifier.endpage11en
dc.identifier.issn0039-9140en
dc.identifier.journaltitleTalantaen
dc.identifier.startpage1en
dc.identifier.urihttps://hdl.handle.net/10468/16813
dc.identifier.volume285en
dc.language.isoenen
dc.publisherElsevier B.V.en
dc.relation.ispartofTalantaen
dc.relation.projectinfo:eu-repo/grantAgreement/SFI/SFI Frontiers for the Future::Projects/21/FFP-P/10220/IE/LOw COst MOnitoring using Spectroscopy for High quality information on Urban Nitrogen dioxide (LOCOMOSHUN)/en
dc.rights© 2024, Elsevier B.V. All rights are reserved, including those for text and data mining, AI training, and similar technologies. This manuscript version is made available under the CC BY-NC-ND 4.0 license.en
dc.rights.urihttps://creativecommons.org/licenses/by-nc-nd/4.0/en
dc.subjectNitrous acid (HONO)en
dc.subjectNitrogen dioxide (NO2)en
dc.subjectDiesel vehicleen
dc.subjectIncoherent broadband cavity-enhanced absorption spectroscopyen
dc.subjectChassis dynamometeren
dc.subjectMobile monitoringen
dc.titleRapid and high-precision cavity-enhanced spectroscopic measurement of HONO and NO2: Application to emissions from heavy-duty diesel vehicles in chassis dynamometer tests and in mobile monitoringen
dc.typeArticle (peer-reviewed)en
oaire.citation.volume285en
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