Measurement method of polycyclic aromatic hydrocarbon emission of diesel engine

The polycyclic aromatic hydrocarbons (PAHs) of diesel engine exhaust were measured by a method of using Teflon filter and XAD-2 collection, as well as ultrasonic extraction, Soxhlet extraction and GC-MS analysis. The results showed that concentration of different component in PAHs and the peak area had a good linear relationship in the experimental concentration range, and the linear correlation coefficient was above 0.99. Linear range was wider with 0.0125-80 μg/mL. The method was more efficient for samples collection, and extraction efficiency was above 95%. The method had more repeatability, and relative standard deviation was less than 15%. Recoveries of filter samples were 70.1%-95.9%, the recoveries of adsorbent samples were 77.0%-102.6%. The method had higher sensitivity with minimum detection limit of 0.04 μg/m3, so it can be used for rapid analysis of PAHs content on diesel engine.