[Determination of soluble organic fraction in diesel exhaust particulates by gas chromatography/mass spectrometry].
The soluble organic fractions (SOF) in diesel exhaust particulates have been extracted with ultrasonic separator and analyzed by gas chromatography/mass spectrometry (GC/ MS). The GC/MS conditions were as follows: an HP SE-50 capillary column (30 m x 0.2 mm i. d. x 0.2 microm); temperature programming started at 100 degrees C, holding for 2.0 min, then increased to 160 degrees C at a rate of 4.0 degrees C /min, then to 250 degrees C at 8 degrees C/min, finally, kept at 250 degrees C for 31.75 min; boiling chamber temperature 260 degrees C; helium gas as carrier; chapiter pressure 45 kPa; sample size 1 microL; electron impact energy of mass spectrometer 70 eV; multiplier voltage 1 800 V; mass range 300 - 500 u. The results showed that under exhaust temperature, about 80% of SOF in particulates were normal or isomeric alkanes with carbon numbers from 9 to 28. The rest of the fractions of SOF were polycyclic aromatic hydrocarbons (homologs of indene, fluorene, phenanthrene, naphthalene etc.) and other organic substances. It is demonstrated that most of SOF were from unburned diesel and engine oils. The testing conclusion should be useful in designing and evaluating particulate filters.
Wang
Guihua
G
School of Energy & Power Engineering, Shandong University, Jinan 250061, China. sdwangguihua@yahoo.com.cn
Wang
Junxiao
J
Huang
Xuezheng
X
Lu
Jiaxiang
J
Liu
Na
N
D000393:Air Pollutants / Q000032:analysis*; D008401:Gas Chromatography-Mass Spectrometry / Q000379:methods*; D005742:Gasoline; D009930:Organic Chemicals / Q000032:analysis*; D010316:Particle Size; D001335:Vehicle Emissions / Q000032:analysis*
D000393:Air Pollutants; D005742:Gasoline; D009930:Organic Chemicals; D001335:Vehicle Emissions