北台灣火山岩和沉積岩流域化學風化率和對大氣二氧化碳消耗率

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题名:	北台灣火山岩和沉積岩流域化學風化率和對大氣二氧化碳消耗率 Weathering Rate and Carbon-dioxide Consumption of Volcanic Rocks and Sedimentary Rocks in Northern Taiwan's Watershed
作者:	陳彥嘉 Chen, Yen-Chia
贡献者:	化學系應用化學碩士班
关键词:	沉積岩火成岩二氧化碳消耗率 Volcanic Rocks Sedimentary Rocks Carbon-dioxide Consumption
日期:	2015
上传时间:	2015-08-19 14:16:01 (UTC+8)
摘要:	由於人類活動促使大氣二氧化碳濃度逐年增加，引起地球溫室效應，進而影響生態環境與人類健康。而岩石礦物化學風化需要水、二氧化碳和酸，其化學風化產物最後流入溪水。為了解北台灣火山岩和沉積岩流域的化學風化率和二氧化碳消耗率，本研究從2012年6月至2013年9月在台灣北部內雙溪流域的不同地點設立12個測站，每月採集一次溪水樣本，使用離子層析儀分析溪水中的Na+、K+、Ca2+、Mg2+、NH4+、Cl-、NO3-、SO42-各主要離子濃度，並利用電位滴定和Gran plot測定檢度，進而換算次碳酸根離子濃度，用以探討內雙溪流域：(1)溪水成份受氣候因素的影響；(2)岩石化學風化率以及大氣二氧化碳消耗率。結果發現冬季時溪水pH值明顯偏低、而夏季pH明顯偏高，顯示季節會影響溪水的pH。季節和雨量對溪水總溶解固體量(TDS)影響較小。從吉布斯圖解(Gibbs, 1970)內雙溪流域溪水成份主要來自岩石風化，但流域上游(站1和站6)溪水成分受稀釋做用的影響。內雙溪流域化學風化率145 t/km2/yr和二氧化碳消耗率9.52 x 106 mole/km2/yr。 Human activities made concentrations of carbon dioxide in the atmosphere has been increased year by year, then caused global warming. Thus global warming affect the ecological environment and human health. The chemical weathering of rocks and minerals need water, carbon dioxide and acid. Finally, the chemical weathering products of rocks and minerals drain into the river. In order to understand the rate of chemical weathering and carbon dioxide consuming of volcanic rocks and sedimentary rocks basin in northern Taiwan, this study ran from June 2012 to September 2013. We set up 12 stations at different locations within the Northern of Taiwan of Neishuangxi Basin. Creek water samples collected once a month. We used Ion Chromatograph to analyses the stream of concentration of major ions (Na+, K+, Ca2+, Mg2+, NH4+, Cl-, NO3-, SO42-). And used potential titration method and Gran plot to obtain the alkalinity of the sample. The study explores within the Neishuangxi Basin: (1) The stream composition by the impact of climatic factors. (2) The rate of chemical weathering of rock and atmospheric carbon dioxide consumption. This results showed that when the pH value is significantly lower in winter, while significantly higher pH in summer. Seasonal and rainfall is little effect on stream of Total Dissolved Solids (TDS). Diagram from Gibbs (Gibbs, 1970) within the Neishuangxi Basin streams ingredients mainly from the weathering of rocks, but basin upstream (Station 1 and Station 6) stream composition made by dilution with impact. Chemical weathering rates in the Neishuangxi Basin is 145 t / km2 / yr and carbon dioxide consumption rates is 9.52 x 106 mole / km2 / yr.
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