本論文於2018年9月與12月及2019年4月至淡水河河口海域採樣，調查分析樣水中溶解態、懸浮態氮及沉積物氮與碳物種的分佈及其汙染情形，溶解態氮物種分析包含氨氮、亞硝酸鹽、硝酸鹽與總氮，懸浮物樣品分別分析總氮、無機氮，總碳與無機碳，其中樣品中有機氮與碳物種係由總濃度扣減無機氮濃度而得，包括溶解態有機氮與懸浮態有機氮及有機碳。

淡水河河口海域中溶解態以及懸浮態總氮濃度分別為29.39-488.56μM與0.11-4.40%，其中溶解態總氮濃度佔水中總氮(溶解態+懸浮態)濃度90%以上，而懸浮態氮濃度大都小於10%，顯示樣水中總氮濃度主要以溶解態氮存在，其濃度分別為: 氨氮 8.23-369.17 μM; 亞硝酸鹽 1.59-9.40 μM; 硝酸鹽5.22-52.36 μM與溶解有機氮 2.50-112.05μM，溶解態無機氮佔溶解態總氮60~98%，其中又以氨氮為主要物種，佔約21~89%，多數測站達50~80%之間，其次為溶解有機氮與硝酸鹽濃度，各佔2~39%與4~34%之間，百分比隨鹽度而異，亞硝酸鹽只佔1~9%，溶解態氮各物種在淡水河河口海域幾乎皆呈現增加行為分佈。

懸浮態氮的濃度分別為無機態0.02-1.37%與有機態 0.04-3.33%，在三次調查中所得有機氮與無機氮所佔百分比有差異，但整體而言上游河段以有機氮為主，但中下游河段懸浮態無機氮百分比會增加，倆者濃度在中游河段明顯減少，基本上呈現移除行為。樣水中氮在溶解態與懸浮態之分佈係數(Kd)值範圍為2.75~3.88，此值受鹽度與懸浮物濃度的影響並不明顯。沉積物氮與總有機碳濃度範圍為0.18-1.03%與0.11-2.00%，不同時間調查其濃度差異明顯，但其濃度與粒徑大小關係似乎不明顯。整體而言，淡水河河口海域氮濃度極高汙染非常嚴重，且以氨氮為主，造成嚴重優養化現象及氮的地化循環，與世界其他河口海域以硝酸鹽為主要物種亦呈現明顯差異。

The estuarine water and sediment samples were taken from the Danshuei River Estuary, the northern Taiwan, during September and December, 2018, and April, 2019. The water samples were analyzed different speciation of N, including ammonium, nitrite, nitrate, total dissolved N (TDN), particulate inorganic N (PIN) and total particulate N (TPN), and the partitioning distributions were studied. The sediment samples were determined the total N and total organic C. The associated organic N in each phase was obtained from the total concentration deduction the inorganic concentration.

The total dissolved and particulate N concentrations found in the Danshuei River Estuary ranged within 29.39-488.56μM and 0.11-4.40%, respectively. The contribution of TDN to the TN (TDN+TPN) pool generally exceeded 90% within the estuary, suggesting that the TDN dominated the TN concentrations. The concentration ranges of dissolved N within the estuary were as follows: ammonium, 8.23-369.17 μM; nitrite, 1.59-9.40 μM; nitrate, 5.22-52.36 μM and DON, 2.50-112.05μM. DIN dominated the TDN concentrations and occupied 60~98% of TDN pool. Ammonium ranked the first species and occupied 21~89% of TDN pool. Nitrate and DON were the second and the third species and occupied 4~34% and 2~39% of TDN pool, respectively. Nitrite was the minor species and the contribution was generally < 9% of TDN pool. Basically, these species of N generally exhibited the additional behavior within the estuary.

The particulate inorganic and organic N concentrations found in the Danshuei River Estuary ranged within 0.02-1.37% and 0.04-3.33%, respectively, and exhibited the temporal variation during the different surveys. The particulate organic N generally dominated the TPN pool, but the contribution seemed to decrease from the mid-estuary. Overall, both PIN and PON concentrations significantly decreased from the mid-estuary and exhibited the removal behavior within the estuary. The partitioning distributions of N between dissolved and particulate phases ranged within 2.75-3.88 and the values seemed to be independent upon the salinity and SPM concentrations. The concentrations of N and TOC in the estuarine sediments ranged within 0.18-1.03% and 0.11-2.00%, respectively, and did not inversely correlate with the grain size. Finally, the N data analyzed in the present study suggest that the Danshuei River Estuary is seriously polluted by N element and is an eutrophic estuary. In addition, ammonium is the major species of DIN within the Danshuei River Estuary, completely differing from the other estuaries worldwide where nitrate generally dominates the major species of DIN.

致謝 I
摘要 II
Abstract III
第一章 前言 1
第二章 研究地區及採樣 5
2.1研究地區 5
2.2採樣方法 6
2.3樣品前處理 7
第三章 分析方法 9
3.1基本水質分析 9
3.2溶解態氮分析 9
3.1.1溶解態無機氮(DIN) 9
3.1.2溶解態總氮(TDN) 11
3.3碳氮元素分析 13
3.2.1懸浮態碳與氮 13
3.2.2沉積物總氮 15
3.4沉積物總有機碳分析(TOC) 15
3.5沉積物粒徑分析 16
第四章 結果與討論 17
4.1 基本水質資料 17
4.2溶解態氮之分佈 20
4.3懸浮態碳氮之分佈 27
4.4分佈係數 34
4.5沉積物碳氮之分佈 36
4.6碳氮比 41
第五章 結論 44
參考文獻 45

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