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3 results for “Diacids and related compounds”
Year-round observations of stable carbon isotopic composition of diacids and related compounds in fine aerosols at Tianjin, North China – Data set
<p>To better understand the origins and photochemical processing of water-soluble organic aerosols in the Tianjin region, North China, we studied the stable isotopic composition (δ<sup>13</sup>C) of diacids, oxoacids, α-dicarbonyls, citric acid and fatty acids in fine aerosols (PM<sub>2.5</sub>) collected at an urban (Nankai District, ND; <em>n</em> = 121) and a suburban (Haihe Education Park, HEP; <em>n</em> = 40) sites in Tianjin from 5 July 2018 to 4 July 2019. The δ<sup>13</sup>C of diacids and related compounds were measured using a capillary gas chromatography (Agilent 7890B) coupled with isotope ratio mass spectrometry (GC-irMS) system. Based on seasonal variations in δ<sup>13</sup>C of selected species and linear relations with their concentrations and mass ratios, we found that the diacids and related compounds were mainly derived from fossil fuel including coal combustion and biomass burning and photochemical processing, preferably in gaseous- and aqueous-phases in warm (March-September) and cold (October-February) periods, respectively, in Tianjin, North China.</p>
Bulk components and diacids and related compounds in size-segregated aerosols at Tianjin, North China – Data set
<p>To better understand the sources of atmospheric aerosols in winter, we collected size-resolved (9-stage) aerosols at Tianjin, North China, and studied for inorganic ions, carbonaceous components, diacids and related compounds. Inorganic ions were measured using ion chromatography (ICS-5000 System, China, Dai An). Organic carbon (OC) and elemental carbon (EC) were measured using OC/EC analyzer (USA, Sunset Laboratory Inc.), based on thermal light reflectance following the IMPROVE protocol of the protective visual environment. Water-soluble organic carbon (WSOC) was measured using the total organic carbon (TOC) analyzer (model: OI, 1030W + 1088). Concentrations of diacids and related compounds were measured using a capillary gas chromatography (GC; Agilent 7890B). Peak identification was carried out with reference to authentic standards retention time measured by GC-FID and mass spectra performed using a GC-mass spectrometry (GC-MS) system. Based on the results obtained, we found that the atmospheric aerosols over the Tianjin region, North China were derived from mixed: both anthropogenic and biogenic, sources and the subsequent secondary formation/transformations were also important in winter.</p>
Molecular and 13C isotopic composition of diacids and related compounds in wintertime PM2.5 at three sites over Northeast Asia – Data set
<p>To investigate the spatial changes in atmospheric organic aerosols (OA) loading and composition over the northeast Asian region, fine aerosols (PM<sub>2.5</sub>) were collected at three sites: Tianjin (TJ), North China and in Padori (PD) and Daejeon (DJ), South Korea, during winter 2019. We studied the molecular distributions and compound-specific carbon isotopic composition (δ<sup>13</sup>C) of dicarboxylic acids (diacids), oxocarboxylic acids (oxoacids) and α-dicarbonyls as well as the carbonaceous and inorganic ionic components in two sets of selected samples, representing a clean and a polluted period, during the campaign. Based on the molecular distributions and δ<sup>13</sup>C of diacids and related compounds and mass ratios and linear relations of selected species, we discuss the origins of OA and the influence of long-range transported air masses on their loading and composition over Northeast Asia.</p>
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