本研究旨在建立適用於臺灣環境之大氣硫與氮乾沉降標準採樣方法，參考美國國家大氣沉降計畫（National Atmospheric Deposition Program， NADP）之氨氣監測網（Ammonia Monitoring Network， AMoN）和東亞酸沉降監測網（Acid Deposition Monitoring Network in East Asia， EANET）之監測架構，於國立中央大學氣象站建立示範站，在 2025 年 10 至 2026 年 5 月期間進行雙週採樣，運用 Radiello 被動式氨氣擴散採樣管（Passive Ammonia Diffusive Sampler， PS）與主動式濾紙匣（Filter Pack， FP）系統，皆以離子層析儀（Ion Chromatography， IC）進行陰、陽離子分析。本研究建立之採樣與分析具備高可靠性，各項空白、加標和重複樣品分析均符合品管標準。 被動式氨氣採樣所獲得濃度為 1.74-4.47 μg m-3，示範站的濃度落在 AMoN 監測網呈現都市與低密度鄉村環境之過渡區間。主動式濾紙匣氣態物種中以 NH3 為主要成分，濃度介於 3.05-10.43 ppb；顆粒物部分則以 p-NO3- 與 p-SO42- 為主要成分。為評估大氣中硫與氮前驅物的氧化轉化程度，透過硫氧化率（Sulfur Oxidation Ratio， SOR）和氮氧化率（Nitrogen Oxidation Ratio， NOR）進行分析，各採樣期間 SOR 和 NOR 的平均值分別為 0.61 與 0.15，顯示大氣中具有二次轉化特徵，離子當量比值則顯示研究期間伴隨著氯損失現象。此外，將 FP 濃度資料與國際監測網資料相比，示範站呈現都會近郊污染特徵，並參考與示範站地表特性相近之國內外研究乾沉降速度，進行初步乾沉降通量估算，結果顯示氣態與顆粒物乾沉降皆以氮化合物貢獻最高，其中氣態以 NH3，顆粒物為 p-NO3- 為主。以氨氣物種，被動式擴散採樣管與主動式濾紙匣所得到的監測結果在時間變化上呈現良好一致性（r = 0.919），皆能有效反映環境 NH3 濃度之相對變化。;This study aims to establish a standardized sampling protocol for atmospheric sulfur and nitrogen dry deposition applicable to Taiwan， with reference to the monitoring frameworks of the Ammonia Monitoring Network (AMoN) under the U.S. National Atmospheric Deposition Program (NADP) and the Acid Deposition Monitoring Network in East Asia (EANET). A demonstration station was established at the meteorological station of National Central University， where biweekly sampling was conducted from October 2025 to May 2026 using Radiello passive ammonia diffusive samplers (PS) and an active Filter Pack (FP) system. Anions and cations collected by both sampling systems were analyzed using ion chromatography (IC). The sampling and analytical methods established in this study demonstrated good reliability， with blank， spiked， and duplicate samples all meeting quality control criteria. Atmospheric NH3 concentrations measured using the passive samplers ranged from 1.74 to 4.47 μg m-3， placing the demonstration site within the transitional range between urban and low-density rural environments represented in the AMoN network. Among the gaseous species measured using the active filter-pack system， NH3 was the dominant component， with concentrations ranging from 3.05 to 10.43 ppb. In the particulate phase， p-NO3- and p-SO42⁻ were the major ionic components. The sulfur oxidation ratio (SOR) and nitrogen oxidation ratio (NOR) were further used to evaluate the oxidative conversion of atmospheric sulfur- and nitrogen-containing precursors. The mean SOR and NOR values during the study period were 0.61 and 0.15， respectively， indicating the occurrence of secondary atmospheric transformation processes. Ionic equivalent ratios also suggested the occurrence of chloride depletion during the monitoring period. Compared with data from international monitoring networks， the demonstration site exhibited pollution characteristics typical of a peri-urban environment. Preliminary dry deposition fluxes were estimated using dry deposition velocities from domestic and international studies with land-use characteristics similar to those of the demonstration site. The results indicated that nitrogen compounds were the major contributors to both gaseous- and particulate-phase dry deposition， with NH3 dominating the gaseous phase and p-NO3- dominating the particulate phase. For atmospheric ammonia， the passive diffusive sampler and active filter-pack system showed strong agreement in their temporal variations (r = 0.919)， indicating that both methods effectively captured relative changes in ambient NH3 concentrations.
