第八届青年地学论坛

With the sustained strict control of combustion-related emissions over last decades, volatile chemical products (VCPs) have become an increasingly important anthropogenic source of gas-phase reactive organic carbon (ROC) emissions. In the present work, on-site measurements of gas-phase ROC were performed for typical VCPs manufacturing, including coatings, pesticides, asphalts, consumer products and plastics. Herein, we comprehensively characterized a wide volatility range of organic compounds using a thermal desorption two-dimensional gas chromatography coupled with a quadrupole mass spectrometer (TD-GC×GC-qMS) and a GC coupled with MS and flame ionization detection (GC-MS/FID). In total, 623 species were resolved at the molecular level. Similarity analysis using the Euclidean metric (d) and Pearson correlation coefficient (r) revealed that VCPs manufacturing emissions were product-specific and varied significantly from product to product. Mass fractions of IVOCs ranged from 3.48‰ to 34.97%. Detergents, water-based coatings, asphalts and hair cosmetics possessed high proportions of IVOCs (15.09-34.97%). VOCs dominated OFP, while IVOCs contributed as much as VOCs to SOAP. IVOCs contributed even more to SOAP than VOCs in water-based coating, asphalt and detergent emissions. In terms of chemical components, aromatics were the primary control compounds for the synergistic reduction of O₃ and SOA. This work demonstrates that IVOCs from VCPs manufacturing are non-negligible. Our measured source profiles containing IVOCs can provide supports for model simulations and parameter estimations, allowing for a more accurate estimate of the impacts of VCPs manufacturing on China's ambient atmosphere.

挥发性化学品,半挥发性有机物,二次有机气溶胶