真色色度的檢測一般使用ADMI 3波長或31波長法，只能以人工方式取樣分析，得到批次的真色色度資料，無法掌握水質的變化情形，因此本研究探討以CCD數位攝影機連續拍攝廢水之數位影像，即時、連續監測廢水中真色色度之可行性。 研究結果顯示，數位影像法檢量線呈線性，線性相關係數r在0.99以上，以250ADMI之標準溶液測定時，準確度為104.6±7.1%，精密度RSD%為3.4%，方法偵測極限為49ADMI，數位影像法可以準確的檢測廢水真色色度；在品質管制上，樣品重複分析相對差異百分比在10%以內，品管查核樣品分析回收率在100±6%以內，實驗數據具有一定之品質，可用於檢測廢水之色度。 數位影像法經由Visual Basic撰寫之程式連續監測廢水真色色度，具有即時、連續、自動測定廢水真色色度的功能，可做為廢水處理廠即時控制之水質參數及監測放流水色度，而測定之真色色度值可儲存於資料庫，提供查詢功能，且測定之彩色影像儲存於電腦，可證明廢水之水質狀況，這些是傳統3或及31波長法所沒有的優點。 若將數位影像法、3波長及31波長法測定之結果加以比較，以統計之t檢定來檢定實驗結果，顯示數位影像法和31波長法二種方法檢測值無顯著差異；3波長法檢測值和數位影像法或31波長法檢測值有顯著差異，且3波長法測得真色色度值比數位影像法或31波長法測得色度值高。 Generally, the measurement methods of true color, ADMI 3- or 31-wavelengths, are using artificially grab sampling to obtain a batch measured data. However, these approaches are difficult to know well the variations of water quality. The purpose of this study is to investigate the real-time and continuous monitoring method of true color by digital image produced from CCD digital camera. The study results reveal that the linear correlation coefficient (r) of digital image calibration curves are above 0.99. Using the standard solution of 250 ADMI to measure the feasibility of this method, the degree of accuracy and precision (RSD%) are 104.6±7.1% and 3.4% respectively, and the detection limit is 49ADMI. These results reveal the digital image method can measure the true color of wastewater accurately. Based upon the measurement of quality control to check the reproducibility, the relative errors of sample duplicate analysis is no more than 10%, and the recovery of quality sample analysis is within 100±6%. Combining the digital image method with the Visual Basic programming develops a continuous monitoring true color instrument to real-time automatic measure the true color of wastewater. The measured values and images can be saved in the database, and supply the inquire function. Using statistical t test to compare the measured results of digital image, 3- and 31-wavelength methods, the results reveal that no significant differences between the digital image and 31-wavelength approaches, the 3-wavelength approach measured values are higher than which measured by digital image and 31-wavelength methods.
