| Summary: | 碩士 === 國立成功大學 === 環境工程學系碩博士班 === 90 === Carbonaecous species in ambient particle are emitted from varies sources , for fine particle , most of them are produced from combustion processes , like diesel trucks . gasoline cars . motorcycle . and the combustion processes of fuel and coal . In addition , the secondary organic aerosol produced by photochemical reaction is also the major part of carbonaceous species.
This research discuss the carbonaceous species of ambient particle , fugitive sources and mobile sources. Then , estimate the contribution of of secondary organic carbon by the minimum OC/EC ratio of ambient particle. In addition , we use the result of CMB recept model and emission inventory to estimate the OC/EC ratio of primary sources.
The PM2.5 concentration in this research ranged from about 11.8 to 105 μg/m3 and the PM10 ranged about 30.7 to 110 μg/m3 .The particle concentration in southern Taiwan is higher than in the middle of Taiwan and summer lower than winter.
For mobile sources , the result of motorcycle channel sampling is close to the result of two stroke motorcycle in high r.p.m. condition , and the OC/EC ratio of PM2.5 and PM10 are 5.4 and 6.2 . The result of car channel sampling is different to the result of diesel truck tail pip. The OC/EC ratio of car channel sampling is 0.41 , 0.57 and 0.72 , 1.05 of tail pip .The OC/EC ratio of fugitive sources of PM2.5 and PM10 are : farm soil (1.71 , 3.16) , resuspended dust (4.6 , 3.4) and construction work place (0.65 , 1.64).
The concentration of secondary organic carbon calculated by the minimum OC/EC ratio , for PM2.5 , the concentration ranged 8.87 to 23.7μg/m3 and contribute the total organic carbon from 32% to 90% : ranged 5.54 to 22.1μg/m3 and contribute from 24% to 61% for PM10. But the minimum OC/EC ratio of ambient particle is smaller than the calculated ratio , though the concentration would be over estimated.
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