河水做為水循環的一部份，在生態環境中是不可或缺的淡水資源，若因為人類活動對河水造成過多的汙染，不僅會影響流域生態，也可能會因為匯入海水而擴大影響範圍。除了用各種元素濃度作為簡單的指標，許多研究利用硼同位素或鍶同位素在河水不同端源的差異性，來了解風化作用與人為汙染對河水的影響，從而更深入理解水循環的機制。台灣二仁溪在1970~1980年代，因為工業發展導致嚴重的重金屬汙染，重創當地的生態環境。除此之外，二仁溪流域內的人為活動，包括農作物施肥、畜牧放流以及民生汙水，也對河水化學組成和生態造成不同程度的影響。
本研究旨在探討二仁溪河水於空間及時間上是否有明顯的化學組成變化，嘗試區分自然環境與人為汙染端源，並判別近年人為汙染程度的變動。我們於2021年7月採集二仁溪從上至下游的河水樣品，作為探討空間上變化的依據，並結合前人文獻的數據，探討河水化學組成於時間上的變化。河水的陰離子濃度是利用離子層析儀(IC)量測，並以感應耦合電漿原子放射光譜儀(ICP-OES)與四極柱感應耦合電漿質譜儀(ICP-QMS)測定其他主要元素與微量元素濃度。硼和鍶同位素分析則是先於無塵室中分別使用微昇華法及管柱層析法，進行硼、鍶純化，再以多接收器感應耦合電漿質譜儀(MC-ICP-MS)精確測量硼同位素(δ11B)與鍶同位素(87Sr/86Sr)用於後續討論。
結果顯示，二仁溪流域的河水在空間上的組成差異主要受岩石風化與海水的影響，其中δ11B範圍為+4.8到+30.4‰，差異約26‰；而87Sr/86Sr範圍落在0.709679~0.71044。結合前人文獻中2000、2001與2012年，相同採樣點的河水樣品數據共同探討，透過元素濃度及δ11B、87Sr/86Sr的數據分析，顯示二仁溪上游地區河水主要受矽酸鹽風化影響，而下游地區則是受海水、海水鹽沫或天水的影響較為顯著，與區域地質和水文條件吻合。另外，根據δ11B與Cl⁻/Na、NO3⁻/B濃度比值分析，近年二仁溪中下游地區的支流可能仍有受到些微的人為汙染。

River water, as a part of the water cycle, is an essential resource for ecosystems and the most accessible freshwater resource for human development. Beside using various element concentrations as simple indicators, many studies utilize the different indexes, such as boron isotopes or radiogenic strontium isotopes in river water end-members, to understand the relationship between river water, weathering processes, and anthropogenic pollution. This study investigates whether there are significant spatial and temporal variations in the chemical composition of the Erren River water, aiming to distinguish between natural and anthropogenic contribution to the river and to determine if there is ongoing anthropogenic pollution in recent years. We collected river water samples from the Erren River, spanning from upstream to downstream, to examine spatial variations. The river water samples were processed through micro-sublimation or column chromatography, followed by isotope measurement using MC-ICP-MS. The δ11B ranges from +4.8‰ to +30.4‰, with a variation of about 26‰, while the 87Sr/86Sr ranges from 0.709679 to 0.710446. Analysis of major ion and element concentrations, along with boron and strontium isotopic composition, indicates that the upstream river water is mainly influenced by silicate weathering, whereas the downstream areas are significantly affected by seawater, sea spray, and precipitation, consistent with regional geological and hydrological conditions. Additionally, analysis of δ11B and Cl⁻/Na and NO3⁻/B concentration ratios suggests that tributaries in the mid to lower parts of the Erren River may still be affected by anthropogenic pollution in recent years.

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