本研究於94 年的4 月份到95 年的3 月份於大寮地區進行四次對粒
狀物水溶性離子和氣相前驅物採樣，研究目的為解析於大氣中次微米
(submicron)水溶性離子及氣相前驅物隨事件日發生而產生的差異，環境
因子對粒狀物事件日的影響，估量偵測極限遂訂定以12 小時為週期的採
樣。
粒狀物以MOUDI 和Nano-MOUDI 濾紙收集，而氣狀物部分則以
ADS 同心圓管柱吸附。於高屏重點污染地區大寮測站分別取得事件日
(PM10 濃度>125μg/m3)有效樣品11 組和非事件日(PM10 濃度<125μg/m3) 8
組樣品；以探討於事件日和非事件日條件下粒狀物次微米粒徑範圍(dp<1
μm)與氣相前驅物物種關係的差別。
實驗結果，事件日和非事件日主要分佈差異在於細粒徑範圍的
0.32~1.8μm 和粗粒徑的3.2~18μm 粒徑範圍之間；以日夜變化來看，粒徑
波峰在事件日夜間時主要增量波峰於1.0~1.8μm 之間，明顯與其他非事件
日日夜間與事件日日間細粒徑增量在0.56~1μm 為高峰不同；而粗粒徑則
同在3.2~18μm 粒徑範圍間。
事件日和非事件日增加重量濃度最多在2.5μm 以下的細粒徑範圍，
與硫酸根、硝酸根及銨根增量的表現相符；於細粒徑增量最多的粒徑範
圍0.32~1.8μm 對事件日和非事件日累積濃度值差異做相關矩陣得到硫酸
根、硝酸根及銨根相關係數R2 均高達0.9 以上。
事件日和非事件日分組相比，較高的前驅氣體物種為HNO2、HNO3
和SO2 而非事件日前驅氣體物種較高的則為HCl 和NH3，以所有前趨氣
體來看，濃度最高的為NH3，其次為SO2，餘前趨氣體大約在5ppb 以下；
並以離子與氣相前驅物做相關矩陣可知，離子與氣相前驅物多在細粒徑
(PM2.5)以下相關性較高。
iv
於事件日和非事件日對環境因子溫濕度做回歸曲線發現，濃度值差
異最大細粒徑粒徑範圍部分與濕度成正相關，與溫度成負相關，可能與
潮解現象有關；為了進一步探討事件日成因，於0.32~1.8μm 粒徑範圍，
以事件日和非事件日差異影響最大的硫酸根、硝酸根及銨根離子的質量
中數粒徑對溫濕度做回歸曲線分析；亦發現與濕度成正相關，其中以連
續採樣時段事件日日間的NH4
+(R2=0.8534)和SO4
2-(R2=0.8062)顯示與濕
度高度相關；和溫度比較，可發現與溫度無甚相關。
以前驅氣體的轉化指數SOR、NOR 對硫和氮的轉化做討論，SOR 於
粒徑分佈中，轉化均集中於0.1~1.8μm 之間，NOR 於粒徑分佈則顯示粗
細粒徑均有相當的轉化程度，唯在0.1~1.8μm 的粒徑範圍轉化程度於事件
日大於非事件日，夜間大於日間的顯示關係上有明顯的差異。

This study investigates the relationship between concentration of ambient
submicron and episode day .The experiments were implemented from
October, 2005 to March, 2006. Four times field sampling have been
conducted to collect particles with MOUDI and Nano-MOUDI system and
adsorb gas-phase components with Annular Denuder System (ADS) regard 12
hours as a cycle. The framework of research included three parts: (1) to
investigate the difference of concentration of aerosol and precursors between
PM episode days and the Non-episode day, (2) the relationship between
water-soluble inorganic ions and precursors, and (3) the daily variation of
submicron aerosol and precursors composition.
Test data shows that 0.32~1.8μm in fine fraction and 3.2~18μm in coarse
part have the most difference in size distribution between episode day and
non-episode day. Nocturnal size distribution in episode day has unique
phenomenon is the droplet mode between 1.0 to 1.8μm peak in fine fraction
and it is larger than the other three types: daytime of episode day, daytime of
non-episode day, and night time of non-episode. In coarse part, all peak are
show the same size range between 3.2~18μm. Correlation matrix is using to
evaluate the most relevant ions, which are sulfate, nitrate and ammonium, at
the increase mass concentration between episode day and non-episode day.
The results show R2 for all ions are higher than 0.9.
Gas phase pollutants, HNO2、HNO3 and SO2, are higher in PM episode
day and HCl、NH3 are not. In average, ammonia of ambient concentration is
the highest precursors, sulfur dioxide is the next, and others in average are
almost below 5 ppb. With our observation, while water-soluble ions
diameter in fine fraction (PM2.5) or even smaller are relevant the higher
relationship between gas phase pollutants. Considering the effect of
vi
atmosphere temperature and the relative humidity, the mass media diameter
grows up with higher relative humidity and decline as temperature raise in
fine fraction. Furthermore, the most critical size range observed in episode
day has the positive correlation with RH, especially in daytime. On the
contrary, temperature has low correlation or no relationship.
Considering the transformation of gas phase to particle, SOR and NOR as
indicator of sulfur and nitrogen, respectively. The result indicated that SOR
or NOR are both higher in size range 0.1~1.8 μm in the episode day than
Non-episode day. For this size fraction, nitrous has the most difference on
gas to particle transformation, the result is episode larger than non-episode,
and night time larger than daytime, respectively.

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