Ionic strength effects on the photochemical degradation of acetosyringone in atmospheric deliquescent aerosol particles

A number of laboratory experimental investigations, field campaigns, and modeling results have emphasized the role of aqueous-phase photochemical reactions in the formation of secondary organic aerosols (SOA). However, investigations focused on aqueous-phase reactions under high ionic-strength condi...
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Gespeichert in:

Autor*in:	Zhou, Wentao [verfasserIn] Mekic, Majda [verfasserIn] Liu, Jiangping [verfasserIn] Loisel, Gwendal [verfasserIn] Jin, Biao [verfasserIn] Vione, Davide [verfasserIn] Gligorovski, Sasho [verfasserIn]

Format:	E-Artikel
Sprache:	Englisch

Erschienen:	2018

Schlagwörter:	Aerosol Biomass burning Photochemistry Ionic strength UV-VIS spectroscopy

Übergeordnetes Werk:	Enthalten in: Atmospheric environment - Amsterdam [u.a.] : Elsevier Science, 1967, 198, Seite 83-88
Übergeordnetes Werk:	volume:198 ; pages:83-88

DOI / URN:	10.1016/j.atmosenv.2018.10.047

Katalog-ID:	ELV001243632

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245	1	0	\|a Ionic strength effects on the photochemical degradation of acetosyringone in atmospheric deliquescent aerosol particles
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520			\|a A number of laboratory experimental investigations, field campaigns, and modeling results have emphasized the role of aqueous-phase photochemical reactions in the formation of secondary organic aerosols (SOA). However, investigations focused on aqueous-phase reactions under high ionic-strength conditions are scarce. Here we study the photochemical behavior of a lignin-derived compound, acetosyringone (AcS), upon addition of an inert salt (NaClO4). The increase in the ionic strength modifies the acidic constant of AcS, enhancing its deprotonation. As a consequence, the UV-VIS absorption spectra of AcS undergo modifications due to red shifts at high ionic strength of the electronic transitions n → π* (from λmax = 297 nm to λmax = 354 nm) and π → π* (from λmax = 214 nm to λmax = 247 nm). At fixed pH = 4, representative of moderately acidic atmospheric aerosol deliquescent particles, the pseudo-first-order rate constants (k1st) of AcS increased by ∼6 times from a dilute aqueous phase to a solution with an effective ionic strength Ieff. = 0.46 M. The rate constant then followed a saturation trend at elevated ionic strength up to Ieff. = 3.1 M. A similar saturation effect of the observed rate constants with ionic strength was observed in presence of NaCl and Na2SO4. Differential absorption spectroscopy (DAS) methodology was applied to examine the changes in absorption spectra of AcS upon prolonged light irradiation. The very subtle pH-induced changes of the absorption spectra of irradiated AcS are due to the formation of acidic compounds emerged upon photochemical transformation of AcS.
650		4	\|a Aerosol
650		4	\|a Biomass burning
650		4	\|a Photochemistry
650		4	\|a Ionic strength
650		4	\|a UV-VIS spectroscopy
700	1		\|a Mekic, Majda \|e verfasserin \|4 aut
700	1		\|a Liu, Jiangping \|e verfasserin \|4 aut
700	1		\|a Loisel, Gwendal \|e verfasserin \|4 aut
700	1		\|a Jin, Biao \|e verfasserin \|4 aut
700	1		\|a Vione, Davide \|e verfasserin \|0 (orcid)0000-0002-2841-5721 \|4 aut
700	1		\|a Gligorovski, Sasho \|e verfasserin \|0 (orcid)0000-0003-4151-2224 \|4 aut
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936	b	k	\|a 38.81 \|j Atmosphäre
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Indexfelder

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allfields	10.1016/j.atmosenv.2018.10.047 doi (DE-627)ELV001243632 (ELSEVIER)S1352-2310(18)30737-4 DE-627 ger DE-627 rda eng 550 690 DE-600 38.81 bkl 43.00 bkl 30.00 bkl Zhou, Wentao verfasserin aut Ionic strength effects on the photochemical degradation of acetosyringone in atmospheric deliquescent aerosol particles 2018 nicht spezifiziert zzz rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier A number of laboratory experimental investigations, field campaigns, and modeling results have emphasized the role of aqueous-phase photochemical reactions in the formation of secondary organic aerosols (SOA). However, investigations focused on aqueous-phase reactions under high ionic-strength conditions are scarce. Here we study the photochemical behavior of a lignin-derived compound, acetosyringone (AcS), upon addition of an inert salt (NaClO4). The increase in the ionic strength modifies the acidic constant of AcS, enhancing its deprotonation. As a consequence, the UV-VIS absorption spectra of AcS undergo modifications due to red shifts at high ionic strength of the electronic transitions n → π* (from λmax = 297 nm to λmax = 354 nm) and π → π* (from λmax = 214 nm to λmax = 247 nm). At fixed pH = 4, representative of moderately acidic atmospheric aerosol deliquescent particles, the pseudo-first-order rate constants (k1st) of AcS increased by ∼6 times from a dilute aqueous phase to a solution with an effective ionic strength Ieff. = 0.46 M. The rate constant then followed a saturation trend at elevated ionic strength up to Ieff. = 3.1 M. A similar saturation effect of the observed rate constants with ionic strength was observed in presence of NaCl and Na2SO4. Differential absorption spectroscopy (DAS) methodology was applied to examine the changes in absorption spectra of AcS upon prolonged light irradiation. The very subtle pH-induced changes of the absorption spectra of irradiated AcS are due to the formation of acidic compounds emerged upon photochemical transformation of AcS. Aerosol Biomass burning Photochemistry Ionic strength UV-VIS spectroscopy Mekic, Majda verfasserin aut Liu, Jiangping verfasserin aut Loisel, Gwendal verfasserin aut Jin, Biao verfasserin aut Vione, Davide verfasserin (orcid)0000-0002-2841-5721 aut Gligorovski, Sasho verfasserin (orcid)0000-0003-4151-2224 aut Enthalten in Atmospheric environment Amsterdam [u.a.] : Elsevier Science, 1967 198, Seite 83-88 Online-Ressource (DE-627)306654113 (DE-600)1499889-0 (DE-576)081984561 1878-2442 nnns volume:198 pages:83-88 GBV_USEFLAG_U SYSFLAG_U GBV_ELV SSG-OPC-GGO GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_105 GBV_ILN_110 GBV_ILN_150 GBV_ILN_151 GBV_ILN_224 GBV_ILN_370 GBV_ILN_602 GBV_ILN_702 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2027 GBV_ILN_2034 GBV_ILN_2038 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2056 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2118 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2190 GBV_ILN_2336 GBV_ILN_2360 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4242 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4313 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4326 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4393 38.81 Atmosphäre 43.00 Umweltforschung Umweltschutz: Allgemeines 30.00 Naturwissenschaften allgemein: Allgemeines AR 198 83-88
spelling	10.1016/j.atmosenv.2018.10.047 doi (DE-627)ELV001243632 (ELSEVIER)S1352-2310(18)30737-4 DE-627 ger DE-627 rda eng 550 690 DE-600 38.81 bkl 43.00 bkl 30.00 bkl Zhou, Wentao verfasserin aut Ionic strength effects on the photochemical degradation of acetosyringone in atmospheric deliquescent aerosol particles 2018 nicht spezifiziert zzz rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier A number of laboratory experimental investigations, field campaigns, and modeling results have emphasized the role of aqueous-phase photochemical reactions in the formation of secondary organic aerosols (SOA). However, investigations focused on aqueous-phase reactions under high ionic-strength conditions are scarce. Here we study the photochemical behavior of a lignin-derived compound, acetosyringone (AcS), upon addition of an inert salt (NaClO4). The increase in the ionic strength modifies the acidic constant of AcS, enhancing its deprotonation. As a consequence, the UV-VIS absorption spectra of AcS undergo modifications due to red shifts at high ionic strength of the electronic transitions n → π* (from λmax = 297 nm to λmax = 354 nm) and π → π* (from λmax = 214 nm to λmax = 247 nm). At fixed pH = 4, representative of moderately acidic atmospheric aerosol deliquescent particles, the pseudo-first-order rate constants (k1st) of AcS increased by ∼6 times from a dilute aqueous phase to a solution with an effective ionic strength Ieff. = 0.46 M. The rate constant then followed a saturation trend at elevated ionic strength up to Ieff. = 3.1 M. A similar saturation effect of the observed rate constants with ionic strength was observed in presence of NaCl and Na2SO4. Differential absorption spectroscopy (DAS) methodology was applied to examine the changes in absorption spectra of AcS upon prolonged light irradiation. The very subtle pH-induced changes of the absorption spectra of irradiated AcS are due to the formation of acidic compounds emerged upon photochemical transformation of AcS. Aerosol Biomass burning Photochemistry Ionic strength UV-VIS spectroscopy Mekic, Majda verfasserin aut Liu, Jiangping verfasserin aut Loisel, Gwendal verfasserin aut Jin, Biao verfasserin aut Vione, Davide verfasserin (orcid)0000-0002-2841-5721 aut Gligorovski, Sasho verfasserin (orcid)0000-0003-4151-2224 aut Enthalten in Atmospheric environment Amsterdam [u.a.] : Elsevier Science, 1967 198, Seite 83-88 Online-Ressource (DE-627)306654113 (DE-600)1499889-0 (DE-576)081984561 1878-2442 nnns volume:198 pages:83-88 GBV_USEFLAG_U SYSFLAG_U GBV_ELV SSG-OPC-GGO GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_105 GBV_ILN_110 GBV_ILN_150 GBV_ILN_151 GBV_ILN_224 GBV_ILN_370 GBV_ILN_602 GBV_ILN_702 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2027 GBV_ILN_2034 GBV_ILN_2038 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2056 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2118 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2190 GBV_ILN_2336 GBV_ILN_2360 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4242 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4313 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4326 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4393 38.81 Atmosphäre 43.00 Umweltforschung Umweltschutz: Allgemeines 30.00 Naturwissenschaften allgemein: Allgemeines AR 198 83-88
allfields_unstemmed	10.1016/j.atmosenv.2018.10.047 doi (DE-627)ELV001243632 (ELSEVIER)S1352-2310(18)30737-4 DE-627 ger DE-627 rda eng 550 690 DE-600 38.81 bkl 43.00 bkl 30.00 bkl Zhou, Wentao verfasserin aut Ionic strength effects on the photochemical degradation of acetosyringone in atmospheric deliquescent aerosol particles 2018 nicht spezifiziert zzz rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier A number of laboratory experimental investigations, field campaigns, and modeling results have emphasized the role of aqueous-phase photochemical reactions in the formation of secondary organic aerosols (SOA). However, investigations focused on aqueous-phase reactions under high ionic-strength conditions are scarce. Here we study the photochemical behavior of a lignin-derived compound, acetosyringone (AcS), upon addition of an inert salt (NaClO4). The increase in the ionic strength modifies the acidic constant of AcS, enhancing its deprotonation. As a consequence, the UV-VIS absorption spectra of AcS undergo modifications due to red shifts at high ionic strength of the electronic transitions n → π* (from λmax = 297 nm to λmax = 354 nm) and π → π* (from λmax = 214 nm to λmax = 247 nm). At fixed pH = 4, representative of moderately acidic atmospheric aerosol deliquescent particles, the pseudo-first-order rate constants (k1st) of AcS increased by ∼6 times from a dilute aqueous phase to a solution with an effective ionic strength Ieff. = 0.46 M. The rate constant then followed a saturation trend at elevated ionic strength up to Ieff. = 3.1 M. A similar saturation effect of the observed rate constants with ionic strength was observed in presence of NaCl and Na2SO4. Differential absorption spectroscopy (DAS) methodology was applied to examine the changes in absorption spectra of AcS upon prolonged light irradiation. The very subtle pH-induced changes of the absorption spectra of irradiated AcS are due to the formation of acidic compounds emerged upon photochemical transformation of AcS. Aerosol Biomass burning Photochemistry Ionic strength UV-VIS spectroscopy Mekic, Majda verfasserin aut Liu, Jiangping verfasserin aut Loisel, Gwendal verfasserin aut Jin, Biao verfasserin aut Vione, Davide verfasserin (orcid)0000-0002-2841-5721 aut Gligorovski, Sasho verfasserin (orcid)0000-0003-4151-2224 aut Enthalten in Atmospheric environment Amsterdam [u.a.] : Elsevier Science, 1967 198, Seite 83-88 Online-Ressource (DE-627)306654113 (DE-600)1499889-0 (DE-576)081984561 1878-2442 nnns volume:198 pages:83-88 GBV_USEFLAG_U SYSFLAG_U GBV_ELV SSG-OPC-GGO GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_105 GBV_ILN_110 GBV_ILN_150 GBV_ILN_151 GBV_ILN_224 GBV_ILN_370 GBV_ILN_602 GBV_ILN_702 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2027 GBV_ILN_2034 GBV_ILN_2038 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2056 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2118 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2190 GBV_ILN_2336 GBV_ILN_2360 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4242 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4313 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4326 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4393 38.81 Atmosphäre 43.00 Umweltforschung Umweltschutz: Allgemeines 30.00 Naturwissenschaften allgemein: Allgemeines AR 198 83-88
allfieldsGer	10.1016/j.atmosenv.2018.10.047 doi (DE-627)ELV001243632 (ELSEVIER)S1352-2310(18)30737-4 DE-627 ger DE-627 rda eng 550 690 DE-600 38.81 bkl 43.00 bkl 30.00 bkl Zhou, Wentao verfasserin aut Ionic strength effects on the photochemical degradation of acetosyringone in atmospheric deliquescent aerosol particles 2018 nicht spezifiziert zzz rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier A number of laboratory experimental investigations, field campaigns, and modeling results have emphasized the role of aqueous-phase photochemical reactions in the formation of secondary organic aerosols (SOA). However, investigations focused on aqueous-phase reactions under high ionic-strength conditions are scarce. Here we study the photochemical behavior of a lignin-derived compound, acetosyringone (AcS), upon addition of an inert salt (NaClO4). The increase in the ionic strength modifies the acidic constant of AcS, enhancing its deprotonation. As a consequence, the UV-VIS absorption spectra of AcS undergo modifications due to red shifts at high ionic strength of the electronic transitions n → π* (from λmax = 297 nm to λmax = 354 nm) and π → π* (from λmax = 214 nm to λmax = 247 nm). At fixed pH = 4, representative of moderately acidic atmospheric aerosol deliquescent particles, the pseudo-first-order rate constants (k1st) of AcS increased by ∼6 times from a dilute aqueous phase to a solution with an effective ionic strength Ieff. = 0.46 M. The rate constant then followed a saturation trend at elevated ionic strength up to Ieff. = 3.1 M. A similar saturation effect of the observed rate constants with ionic strength was observed in presence of NaCl and Na2SO4. Differential absorption spectroscopy (DAS) methodology was applied to examine the changes in absorption spectra of AcS upon prolonged light irradiation. The very subtle pH-induced changes of the absorption spectra of irradiated AcS are due to the formation of acidic compounds emerged upon photochemical transformation of AcS. Aerosol Biomass burning Photochemistry Ionic strength UV-VIS spectroscopy Mekic, Majda verfasserin aut Liu, Jiangping verfasserin aut Loisel, Gwendal verfasserin aut Jin, Biao verfasserin aut Vione, Davide verfasserin (orcid)0000-0002-2841-5721 aut Gligorovski, Sasho verfasserin (orcid)0000-0003-4151-2224 aut Enthalten in Atmospheric environment Amsterdam [u.a.] : Elsevier Science, 1967 198, Seite 83-88 Online-Ressource (DE-627)306654113 (DE-600)1499889-0 (DE-576)081984561 1878-2442 nnns volume:198 pages:83-88 GBV_USEFLAG_U SYSFLAG_U GBV_ELV SSG-OPC-GGO GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_105 GBV_ILN_110 GBV_ILN_150 GBV_ILN_151 GBV_ILN_224 GBV_ILN_370 GBV_ILN_602 GBV_ILN_702 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2027 GBV_ILN_2034 GBV_ILN_2038 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2056 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2118 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2190 GBV_ILN_2336 GBV_ILN_2360 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4242 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4313 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4326 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4393 38.81 Atmosphäre 43.00 Umweltforschung Umweltschutz: Allgemeines 30.00 Naturwissenschaften allgemein: Allgemeines AR 198 83-88
allfieldsSound	10.1016/j.atmosenv.2018.10.047 doi (DE-627)ELV001243632 (ELSEVIER)S1352-2310(18)30737-4 DE-627 ger DE-627 rda eng 550 690 DE-600 38.81 bkl 43.00 bkl 30.00 bkl Zhou, Wentao verfasserin aut Ionic strength effects on the photochemical degradation of acetosyringone in atmospheric deliquescent aerosol particles 2018 nicht spezifiziert zzz rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier A number of laboratory experimental investigations, field campaigns, and modeling results have emphasized the role of aqueous-phase photochemical reactions in the formation of secondary organic aerosols (SOA). However, investigations focused on aqueous-phase reactions under high ionic-strength conditions are scarce. Here we study the photochemical behavior of a lignin-derived compound, acetosyringone (AcS), upon addition of an inert salt (NaClO4). The increase in the ionic strength modifies the acidic constant of AcS, enhancing its deprotonation. As a consequence, the UV-VIS absorption spectra of AcS undergo modifications due to red shifts at high ionic strength of the electronic transitions n → π* (from λmax = 297 nm to λmax = 354 nm) and π → π* (from λmax = 214 nm to λmax = 247 nm). At fixed pH = 4, representative of moderately acidic atmospheric aerosol deliquescent particles, the pseudo-first-order rate constants (k1st) of AcS increased by ∼6 times from a dilute aqueous phase to a solution with an effective ionic strength Ieff. = 0.46 M. The rate constant then followed a saturation trend at elevated ionic strength up to Ieff. = 3.1 M. A similar saturation effect of the observed rate constants with ionic strength was observed in presence of NaCl and Na2SO4. Differential absorption spectroscopy (DAS) methodology was applied to examine the changes in absorption spectra of AcS upon prolonged light irradiation. The very subtle pH-induced changes of the absorption spectra of irradiated AcS are due to the formation of acidic compounds emerged upon photochemical transformation of AcS. Aerosol Biomass burning Photochemistry Ionic strength UV-VIS spectroscopy Mekic, Majda verfasserin aut Liu, Jiangping verfasserin aut Loisel, Gwendal verfasserin aut Jin, Biao verfasserin aut Vione, Davide verfasserin (orcid)0000-0002-2841-5721 aut Gligorovski, Sasho verfasserin (orcid)0000-0003-4151-2224 aut Enthalten in Atmospheric environment Amsterdam [u.a.] : Elsevier Science, 1967 198, Seite 83-88 Online-Ressource (DE-627)306654113 (DE-600)1499889-0 (DE-576)081984561 1878-2442 nnns volume:198 pages:83-88 GBV_USEFLAG_U SYSFLAG_U GBV_ELV SSG-OPC-GGO GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_105 GBV_ILN_110 GBV_ILN_150 GBV_ILN_151 GBV_ILN_224 GBV_ILN_370 GBV_ILN_602 GBV_ILN_702 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2027 GBV_ILN_2034 GBV_ILN_2038 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2056 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2118 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2190 GBV_ILN_2336 GBV_ILN_2360 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4242 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4313 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4326 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4393 38.81 Atmosphäre 43.00 Umweltforschung Umweltschutz: Allgemeines 30.00 Naturwissenschaften allgemein: Allgemeines AR 198 83-88
language	English
source	Enthalten in Atmospheric environment 198, Seite 83-88 volume:198 pages:83-88
sourceStr	Enthalten in Atmospheric environment 198, Seite 83-88 volume:198 pages:83-88
format_phy_str_mv	Article
bklname	Atmosphäre Umweltforschung Umweltschutz: Allgemeines Naturwissenschaften allgemein: Allgemeines
institution	findex.gbv.de
topic_facet	Aerosol Biomass burning Photochemistry Ionic strength UV-VIS spectroscopy
dewey-raw	550
isfreeaccess_bool	false
container_title	Atmospheric environment
authorswithroles_txt_mv	Zhou, Wentao @@aut@@ Mekic, Majda @@aut@@ Liu, Jiangping @@aut@@ Loisel, Gwendal @@aut@@ Jin, Biao @@aut@@ Vione, Davide @@aut@@ Gligorovski, Sasho @@aut@@
publishDateDaySort_date	2018-01-01T00:00:00Z
hierarchy_top_id	306654113
dewey-sort	3550
id	ELV001243632
language_de	englisch
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spellingShingle	Zhou, Wentao ddc 550 bkl 38.81 bkl 43.00 bkl 30.00 misc Aerosol misc Biomass burning misc Photochemistry misc Ionic strength misc UV-VIS spectroscopy Ionic strength effects on the photochemical degradation of acetosyringone in atmospheric deliquescent aerosol particles
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topic_title	550 690 DE-600 38.81 bkl 43.00 bkl 30.00 bkl Ionic strength effects on the photochemical degradation of acetosyringone in atmospheric deliquescent aerosol particles Aerosol Biomass burning Photochemistry Ionic strength UV-VIS spectroscopy
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title	Ionic strength effects on the photochemical degradation of acetosyringone in atmospheric deliquescent aerosol particles
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title_full	Ionic strength effects on the photochemical degradation of acetosyringone in atmospheric deliquescent aerosol particles
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title_sort	ionic strength effects on the photochemical degradation of acetosyringone in atmospheric deliquescent aerosol particles
title_auth	Ionic strength effects on the photochemical degradation of acetosyringone in atmospheric deliquescent aerosol particles
abstract	A number of laboratory experimental investigations, field campaigns, and modeling results have emphasized the role of aqueous-phase photochemical reactions in the formation of secondary organic aerosols (SOA). However, investigations focused on aqueous-phase reactions under high ionic-strength conditions are scarce. Here we study the photochemical behavior of a lignin-derived compound, acetosyringone (AcS), upon addition of an inert salt (NaClO4). The increase in the ionic strength modifies the acidic constant of AcS, enhancing its deprotonation. As a consequence, the UV-VIS absorption spectra of AcS undergo modifications due to red shifts at high ionic strength of the electronic transitions n → π* (from λmax = 297 nm to λmax = 354 nm) and π → π* (from λmax = 214 nm to λmax = 247 nm). At fixed pH = 4, representative of moderately acidic atmospheric aerosol deliquescent particles, the pseudo-first-order rate constants (k1st) of AcS increased by ∼6 times from a dilute aqueous phase to a solution with an effective ionic strength Ieff. = 0.46 M. The rate constant then followed a saturation trend at elevated ionic strength up to Ieff. = 3.1 M. A similar saturation effect of the observed rate constants with ionic strength was observed in presence of NaCl and Na2SO4. Differential absorption spectroscopy (DAS) methodology was applied to examine the changes in absorption spectra of AcS upon prolonged light irradiation. The very subtle pH-induced changes of the absorption spectra of irradiated AcS are due to the formation of acidic compounds emerged upon photochemical transformation of AcS.
abstractGer	A number of laboratory experimental investigations, field campaigns, and modeling results have emphasized the role of aqueous-phase photochemical reactions in the formation of secondary organic aerosols (SOA). However, investigations focused on aqueous-phase reactions under high ionic-strength conditions are scarce. Here we study the photochemical behavior of a lignin-derived compound, acetosyringone (AcS), upon addition of an inert salt (NaClO4). The increase in the ionic strength modifies the acidic constant of AcS, enhancing its deprotonation. As a consequence, the UV-VIS absorption spectra of AcS undergo modifications due to red shifts at high ionic strength of the electronic transitions n → π* (from λmax = 297 nm to λmax = 354 nm) and π → π* (from λmax = 214 nm to λmax = 247 nm). At fixed pH = 4, representative of moderately acidic atmospheric aerosol deliquescent particles, the pseudo-first-order rate constants (k1st) of AcS increased by ∼6 times from a dilute aqueous phase to a solution with an effective ionic strength Ieff. = 0.46 M. The rate constant then followed a saturation trend at elevated ionic strength up to Ieff. = 3.1 M. A similar saturation effect of the observed rate constants with ionic strength was observed in presence of NaCl and Na2SO4. Differential absorption spectroscopy (DAS) methodology was applied to examine the changes in absorption spectra of AcS upon prolonged light irradiation. The very subtle pH-induced changes of the absorption spectra of irradiated AcS are due to the formation of acidic compounds emerged upon photochemical transformation of AcS.
abstract_unstemmed	A number of laboratory experimental investigations, field campaigns, and modeling results have emphasized the role of aqueous-phase photochemical reactions in the formation of secondary organic aerosols (SOA). However, investigations focused on aqueous-phase reactions under high ionic-strength conditions are scarce. Here we study the photochemical behavior of a lignin-derived compound, acetosyringone (AcS), upon addition of an inert salt (NaClO4). The increase in the ionic strength modifies the acidic constant of AcS, enhancing its deprotonation. As a consequence, the UV-VIS absorption spectra of AcS undergo modifications due to red shifts at high ionic strength of the electronic transitions n → π* (from λmax = 297 nm to λmax = 354 nm) and π → π* (from λmax = 214 nm to λmax = 247 nm). At fixed pH = 4, representative of moderately acidic atmospheric aerosol deliquescent particles, the pseudo-first-order rate constants (k1st) of AcS increased by ∼6 times from a dilute aqueous phase to a solution with an effective ionic strength Ieff. = 0.46 M. The rate constant then followed a saturation trend at elevated ionic strength up to Ieff. = 3.1 M. A similar saturation effect of the observed rate constants with ionic strength was observed in presence of NaCl and Na2SO4. Differential absorption spectroscopy (DAS) methodology was applied to examine the changes in absorption spectra of AcS upon prolonged light irradiation. The very subtle pH-induced changes of the absorption spectra of irradiated AcS are due to the formation of acidic compounds emerged upon photochemical transformation of AcS.
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title_short	Ionic strength effects on the photochemical degradation of acetosyringone in atmospheric deliquescent aerosol particles
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author2	Mekic, Majda Liu, Jiangping Loisel, Gwendal Jin, Biao Vione, Davide Gligorovski, Sasho
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However, investigations focused on aqueous-phase reactions under high ionic-strength conditions are scarce. Here we study the photochemical behavior of a lignin-derived compound, acetosyringone (AcS), upon addition of an inert salt (NaClO4). The increase in the ionic strength modifies the acidic constant of AcS, enhancing its deprotonation. As a consequence, the UV-VIS absorption spectra of AcS undergo modifications due to red shifts at high ionic strength of the electronic transitions n → π* (from λmax = 297 nm to λmax = 354 nm) and π → π* (from λmax = 214 nm to λmax = 247 nm). At fixed pH = 4, representative of moderately acidic atmospheric aerosol deliquescent particles, the pseudo-first-order rate constants (k1st) of AcS increased by ∼6 times from a dilute aqueous phase to a solution with an effective ionic strength Ieff. = 0.46 M. The rate constant then followed a saturation trend at elevated ionic strength up to Ieff. = 3.1 M. A similar saturation effect of the observed rate constants with ionic strength was observed in presence of NaCl and Na2SO4. Differential absorption spectroscopy (DAS) methodology was applied to examine the changes in absorption spectra of AcS upon prolonged light irradiation. The very subtle pH-induced changes of the absorption spectra of irradiated AcS are due to the formation of acidic compounds emerged upon photochemical transformation of AcS.</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">Aerosol</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">Biomass burning</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">Photochemistry</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">Ionic strength</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">UV-VIS spectroscopy</subfield></datafield><datafield tag="700" ind1="1" ind2=" "><subfield code="a">Mekic, Majda</subfield><subfield code="e">verfasserin</subfield><subfield code="4">aut</subfield></datafield><datafield tag="700" ind1="1" ind2=" "><subfield code="a">Liu, Jiangping</subfield><subfield code="e">verfasserin</subfield><subfield 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Ionic strength effects on the photochemical degradation of acetosyringone in atmospheric deliquescent aerosol particles

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