摘要
China's aluminum-products industry, a large-scale consumer of industrial paints, is a potentially significant source of full-volatility organic compounds (F-VOCs). However, the emission characteristics of F-VOCs, including VOCs, intermediate-, semi-, and low-volatility organic compounds (I/S/LVOCs), and their role in ozone formation potentials (OFP), and secondary organic aerosol formation potentials (SOAP) remain unclear. In this study, we collected in-field samples from three industrial paints (solvent-based, water-based and powder paints) at spraying and drying processes, and treatment devices to analyze the emission characteristics of F-VOCs, OFP, SOAP. Results revealed water-based and powder paints—often marketed as eco-friendly—emitted non-negligible SOA precursors. The F-VOC emission factors of three paints based on the field measurement method and the material balance method were 3.3–57.3 and 1.5–61.8 (kg/t-raw materials), respectively. Due to overlooking I/S/LVOCs, conventional material balance methods underestimated F-VOC emissions from powder by 46.9–53.9 %, and SOAP and OFP from three paints by 18.1–80.9 % and 14.5–77.8 %, respectively. Despite comprising less than 25.0 % of total emissions, I/S/LVOCs dominated 70.0–80.0 % SOAP. The paint types and treatment devices rather than industrial processes are the main factors influencing volatility, phase distributions, and source profiles. Current controls reduce OFP by ∼80.0 % but SOAP by only ∼20.0 %, highlighting the evasion of I/S/LVOCs from mitigation strategies. In 2023, China's aluminum-products industry emitted 258.4 kt of F-VOCs, comparable to those from on-road diesel transportation. The findings indicate substantial F-VOC emissions from aluminum production and inadequate I/S/LVOC controls, necessitating their inclusion in emission inventories and air-quality models to enhance pollution control.
危险品化学品经营许可证（带存储）