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首页> 外文期刊>International journal of PIXE >CHARACTERIZATION OF ATMOSPHERIC PARTICULATE DURING THE RICE STRAW BURNING PERIOD IN A MIDSIZE CITY IN NORTHERN JAPAN
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CHARACTERIZATION OF ATMOSPHERIC PARTICULATE DURING THE RICE STRAW BURNING PERIOD IN A MIDSIZE CITY IN NORTHERN JAPAN

机译：日本北部中型城市稻秸秆燃烧期的大气颗粒特征

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摘要

Total suspended particulate (TSP) samples were collected from three areas (commercial, residential and agricultural) in and near Akita City in northern Japan, October 1996 (rice straw burning period), over three days with a one-hour sampling interval for each area. The elemental composition and particle shape of TSP samples were determined and/or observed by PIXE and a Scanning Electron Microscope (SEM) combined with Energy Dispersive X-ray (EDX) analysis. In the hourly TSP samples collected during the rice straw burning period, values of 24 elements were determined for each area, and Na, Mg, Al, Si, S, K, Ca and Fe were the major components. Comparing the arithmetic means of elemental concentrations in TSP for the rice straw burning and non-snow-clad period (May – June 1996), in the residential and agricultural areas the Si concentration in the rice straw burning period was approximately two times that in the non-snow-clad period, and K and Ca concentrations in the rice straw burning period were a little higher than those in the non-snow-clad period. In the residential and agricultural areas, change in SPM concentration and change in Si, K and Ca concentrations were in relative agreement during the hours that smoke from rice straw burning was present in the atmospheric space. With the aid of SEM- EDX analysis, many cubic particles were observed for almost all hourly TSP samples. The cubic particles were of the silicon-rich type, and their morphology was rice straw fragments or aggregation of fragments.
机译：1996年10月（稻草燃烧期），从日本北部秋田市及其附近的三个地区（商业，住宅和农业）收集了总悬浮颗粒（TSP）样本，历时三天，每个区域采样间隔为一小时。通过PIXE和扫描电子显微镜（SEM）结合能量色散X射线（EDX）分析来确定和/或观察TSP样品的元素组成和颗粒形状。在稻草燃烧期间每小时收集的TSP样品中，每个区域的24种元素的值均被确定，其中Na，Mg，Al，Si，S，K，Ca和Fe是主要成分。比较稻草燃烧和非积雪时期（1996年5月至6月）中TSP中元素浓度的算术平均值，在居民区和农业区中，稻草燃烧期的Si浓度大约是稻草燃烧期中Si含量的两倍。稻草燃烧期的钾，钙含量略高于非积雪期。在居民区和农业区，在大气空间中存在稻草燃烧所产生的烟气期间，SPM浓度的变化以及Si，K和Ca浓度的变化相对一致。借助SEM-EDX分析，几乎每小时的TSP样品都观察到许多立方颗粒。立方颗粒为富硅型，其形态为稻草碎片或碎片聚集。

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