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頁籤選單縮合
題名 | 環境水質溶氧變化之連續監測=Continued Monitoring of Dissolved Oxygen Variations in the Environment |
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作者姓名(中文) | 黃平志; 許永輝; 吳漢鐘; | 書刊名 | 行政院環境保護署環境監測及資訊處技術彙刊 |
卷期 | 6 2011.05[民100.05] |
頁次 | 頁77-101 |
分類號 | 445.982 |
關鍵詞 | 環境水質監測; 溶氧; 連續監測; Water quality monitoring; Dissolved oxygen; Continuously monitoring; |
語文 | 中文(Chinese) |
中文摘要 | 為能掌握水質狀況,以作為水資源規劃、利用及污染防治政策擬訂之參考,行政院環境保護署(以下簡稱環保署)以委託計畫方式統一辦理「環境水質北、中、南區監測計畫」,監測對象包括河川、地下水、水庫、海域及海灘等環境水體。由於該計畫呈現之數據中,部分河川測站偶有發生有機污染測項測值較高且溶氧飽和率過飽和之狀況,鑑此選擇曾發生類似狀況之測站辦理24小時水質連續監測,以了解其日夜間溶氧測值之差異。 24小時水質連續監測之辦理方式,係針對具上述狀況之測站,記錄溶氧相關之各項指標如水溫、pH值、溶氧、葉綠素a等項目的連續變化以探討各測項相關性及其日夜差之測值差異。由溶氧連續監測結果發現,當白天日照充足而使水溫升高時,會使水中藻類光合作用較為旺盛,使水中溶氧測值及溶氧飽和度隨之升高,即使為分解有機污染物會消耗水中溶氧,旺盛的光合作用仍提供足夠,甚至是過量的氧氣;夜間時,藻類未如日間行光合作用而僅行呼吸作用,惟水中有機物的分解仍持續消耗水中溶氧,在未能補充水中的溶解態氧的狀況下,即造成溶氧測值降低之現象,部分測站在夜間時溶氧甚至降至1 mg/L以下。故由本研究可得知,由日間採樣分析所得的高溶氧測值,其來源可能為水中藻類行光合作用所提供之氧氣,在此狀況下,應為水中營養鹽甚為豐富而導致水生植物過度生長,其代表的可能非為水質良好,而有可能是水質惡化的警訊。 |
英文摘要 | The states of environmental water qualities are important references for planning and utilizing natural water resources and drafting pollution prevention policies. Therefore, the Environmental Protection Administration (EPA), Executive Yuan, R. O. C. (Taiwan) established the Environmental Water Quality Monitoring (EWQM) Program in 2002 to monitor the quality of various water bodies including rivers, groundwater, reservoirs, ocean and beaches in Taiwan. It is interesting that the data obtained from this program showed occasions of high concentrations of Dissolved Oxygen (DO) observed along with high values of organic pollutants at some river stations. Thus, we continuously monitored some stations which had similar conditions over 24 hours, to review the variation of DO values in daytime and night time. We recorded the continuous variation of related factors such as water temperature, pH value, DO and chlorophyll a to examine differences in their concentrations between daytime and night time. The results showed that the DO concentration rose with the vigorous photosynthesis of the algae in water if the water temperature went up with sufficient sunlight. Thus it provided overdosing oxygen to over-saturation although the organic pollutants consumed the DO in water. At night, the algae only respired and the organic pollutants depleted DO continuously. Therefore, the DO concentration in water obviously decreased and it was even lower than 1 mg/L at some stations. From the results of this study, high DO values in water obtained in daytime may be due to the vigorous photosynthesis of the algae. It indicated that there might be rich nutrients in the water and this condition did not represent good water quality but a warning of worsening water quality. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。