紫外线吸收光谱法在水质COD检测中的应用

Application of Ultraviolet Absorption Spectrometry in the Detection of COD in Water

本文开展紫外线吸收光谱谱法在水质COD检测中的应用分析,并给出了COD测试流程。现场测试结果表明,当COD值增加时,样品吸收光谱出现了两个特征峰,即290、570 nm处。以275 nm波长的频谱建立模型,拟合计算结果为y=0.005 6x+0.085 1。比较不同波长模式下COD预测结果和实际值,呈现明显的线型特征,回归方差为0.998 54,均方误差为0.375 81。该研究有助于提高水质检测能力,也可以拓宽到其他相关的检测领域。

In this paper,the application of ultraviolet absorption spectrometry in the detection of COD in water is analyzed,and the testing process of COD concentration is given.The field test results show that when the COD concentration increases,two characteristic peaks appear in the absorption spectrum of the sample,namely,the first absorption peak appears at 290 nm,and the second absorption peak appears at 570 nm.The model was fitted with the spectrum of 275 nm wavelength and the result was y=0.0056x+0.00851.Comparing the predicted COD concentration with the actual COD concentration under different wavelength modes,the linear characteristics are obvious,the regression variance is 0.99854,and the mean square error is 0.37581.This research is helpful to improve the ability of water quality detection,and can also be extended to other chemical related detection fields.