Determination and Characteristic Analysis of Atmospheric Non-Methane Hydrocarbons in a Regional Hub City of North China Plain

Atmospheric non-methane hydrocarbons were measured continuously for one month in east urban area of Jinan in September, 2017. A total of 46 kinds of non-methane hydrocarbons were determined, and studies were performed on their concentration level, diurnal variations, chemical reactivities, and sources as well. The results showed that the total non-methane hydrocarbons concentration was 15.44 ppbv, among them alkanes, alkenes, aromatic hydrocarbons, and acetylene were the major components and their concentration also ranked by this order. The diurnal variation showed bimodal trend and two peaks appeared at 7:00-10:00 and 19:00-21:00, respectively, while the lowest value appeared at 14:00-16:00. Non-vehicle emission sources contributed 86%, 15% and 62.5% to ethylene, methylbenzene and xylene, respectively. Alkenes had higher atmospheric chemical activity and contributed the most to LOH and OFP and the second most contributors were aromatics and alkanes, while the contribution from acetylene was almost zero.