Method for detecting content of chloroacetic acid by using Raman spectrum
A technology of Raman spectrum detection and Raman spectroscopy, which is applied in the field of spectrum detection, can solve problems such as cumbersome detection process, poor reproducibility, and great impact on human health and the environment, and achieve significant economic benefits, accurate content prediction, and measurement short time effect
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Embodiment 1
[0033] (1) Raman detection of chloroacetic acid, dichloroacetic acid and acetic acid standards using Raman spectroscopy
[0034] Use Raman spectrum to carry out Raman detection respectively to the standard substance of chloroacetic acid, dichloroacetic acid, acetic acid, obtain corresponding Raman spectrogram, as attached figure 1 shown, from figure 1 It can be seen that the Raman signal peaks of the three substances are obvious. The Raman spectrum test parameters are as follows:
[0035] Excitation light wavelength: 785nm, laser power: 500mw, detection time: 1s, cumulative times: 1 time.
[0036] (2) Use Raman spectroscopy to detect the sample in the production process of chloroacetic acid, and obtain the Raman spectrum of the sample.
[0037] Raman detection was performed on 21 samples using Raman spectroscopy. Each sample was detected 3 times, and the average spectrum of each sample was obtained. The concentration range of chloroacetic acid in the 21 samples is 70%-100...
Embodiment 2
[0050] According to the method substantially the same as Example 1, the Raman detection is carried out to the chloroacetic acid production process sample, the difference is: in step (2), the concentration of chloroacetic acid in the chloroacetic acid production process sample is 60%-90%, two The concentration of chloroacetic acid is 5%-30%, and the concentration of acetic acid is 5%-20%. The Raman spectrum detection parameters in step (2) are: excitation light wavelength: 633nm, laser power: 500mw, detection time: 5s, cumulative times: 2 times. In step (3), the preprocessing method is: smoothing, and the rest of the steps are the same as in Example 1. The result that obtains under this condition, the linear fitting degree of the real concentration of sample and predicted concentration is excellent, and deviation is also within the range described in above-mentioned embodiment 1, namely the relative deviation of chloroacetic acid is within ± 0.4%, dichloroacetic acid The relat...
Embodiment 3
[0052] Carry out Raman detection to the chloroacetic acid production process sample according to the method basically the same as embodiment 1, difference is: in the step (2) Raman spectrum detection parameter is: excitation light wavelength: 532nm, laser power: 500mw, detection time : 4s, accumulative times: 3 times. In step (3), the preprocessing method is: smoothing and K-S sample division method, all the other steps are the same as in Example 1, the result is obtained under this condition, the linear fitting degree of the true concentration of the sample and the predicted concentration is excellent , the deviation is also within the range described in the above-mentioned embodiment 1, that is, the relative deviation of chloroacetic acid is within ±0.5%, the relative deviation of dichloroacetic acid is within ±0.2%, and the relative deviation of acetic acid is within ±0.2%. .
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