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=0.005 6x+0.008 51.Comparing the predicted COD concentration with the actual COD concentration under different wavelength modes,the linear characteristics are obvious,the regression variance is 0.998 54,and the mean square error is 0.375 81.This research is helpful to improve the ability of water quality detection,and can also be extended to other chemical related detection fields.
关键词
水质检测/紫外线吸收光谱/特征峰/线性回归
Key words
water quality detection/ultraviolet absorption spectrum/characteristic peak/linear regression
维普
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