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.&nbsp;Inorganic ions were measured&nbsp;using ion chromatography (ICS-5000 System, China, Dai An). Organic carbon (OC) and elemental carbon&nbsp;(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).&nbsp;Concentrations of diacids and related compounds were measured using&nbsp;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.&nbsp;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>