Characterization of NMHCs in downtown urban center Kathmandu and rural site Nagarkot in Nepal
Characterization of NMHCs in downtown urban center Kathmandu and rural site Nagarkot in Nepal
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加德满都市中心和尼泊尔纳加阔特农村地区 NMHC 的特征
DOI：
10.1016/s1352-2310(99)00485-9
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发表时间：
2000
影响因子：
5
通讯作者：
H. Akimoto
中科院分区：
文献类型：
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作者：
U. K. Sharma;Y. Kajii;H. Akimoto
1998年11月，尼泊尔首次对从尼泊尔首都加德满都城市和农村的自然和人为来源排放的包括异戊二烯在内的28种不同的C2-C6非甲烷碳氢化合物进行了表征。用GC/FID对38个全空气样品进行了分析。加德满都城市环境空气中的来源特征是乙烯、乙炔和C4-C5烷烃。汽车废气和汽油蒸发源的碳氢化合物排放量被证实超过天然气和生物来源。将加德满都和日本东京的乙炔归一化的NMHCs分布进行比较，发现C2-C5烷烃相对于乙炔有显著差异。农村地区的大量乙烯被归类为生物来源排放，因为它与异戊二烯具有显著的相关性(R2=0.52)。在市区现场观测到的主要异戊二烯(平均278pptv)被归类为来自车辆废气的排放，因为它与其他人类排放的碳氢化合物高度相关(乙炔的R2=0.72)。光化学老化分析表明，城市空气向农村地区输送的混合比变化是通过其OH自由基引发的氧化作用发生的，农村地区观察到的烷烃主要来自于向农村地区输送的空气。
The total of 28 different C2–C6non-methane hydrocarbons including isoprene emitted from natural and anthropogenic sources in urban and rural sites of Kathmandu, capital of Nepal, were characterized for the first time in Nepal, in November 1998. Thirty-eight whole air samples were analyzed by using GC/FID. Ethene, acetylene and C4–C5alkanes were identified as the source signature in Kathmandu urban ambient air. Hydrocarbon emissions from vehicular exhaust and gasoline evaporation sources were confirmed to outweigh natural gas and biogenic sources. Comparison of NMHCs profile normalized by acetylene between Kathmandu and Tokyo, Japan showed prominent difference in C2–C5alkanes relative to acetylene. Significant amount of ethene at the rural site was assigned as emitted from biogenic sources because of its significant correlation with isoprene (R2=0.52). Predominant amount of isoprene (average 278pptv) observed at the urban site were assigned to be emitted from vehicular exhaust as it exhibited high correlation with other anthropogenically emitted hydrocarbons (R2=0.72 with acetylene). Photochemical aging analysis showed that the mixing ratio variation of urban air transporting towards the rural site took place through its OH radical initiated oxidation and the observed alkanes in the rural site were mostly from the transported urban air.
1）利用DnaJ序列的细菌检测和鉴定方法
DOI：
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发表时间：
2006
期刊：
影响因子：
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作者：
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