A kind of infrared spectroscopic analysis method of binary mixture and its application
A technology of infrared spectrum analysis and infrared spectroscopy, which is applied in the fields of material analysis, color/spectral characteristic measurement, material weighing, etc. It can solve the problems of identification of various components, overlapping release characteristics of different gas components, etc.
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Embodiment approach
[0066] According to a preferred embodiment of the present invention, the lack of peak in the system refers to: in the one-dimensional infrared spectrum of the binary mixture, there are absorption peaks at wavelength x and wavelength y, but in the two-dimensional asynchronous spectrum, the point ( There is no cross peak at x, y), then in the two-dimensional asynchronous spectrum, the point (x, y) is a system missing peak.
[0067] Specifically, such as figure 1 Middle (A) shows the two-dimensional asynchronous spectrum of the binary mixture composed of substance m and substance n, and the one-dimensional infrared spectrum of the binary mixture is shown above and to the right. In the one-dimensional infrared spectrum of the mixture it can be seen that at a wavelength of 588 cm -1 And wavelength 730cm -1 The accessories all have absorption peaks, but there is no cross peak near the midpoint (588,730) of the two-dimensional asynchronous spectrum. Similar phenomena appear in all...
Embodiment 1
[0117] Example 1 CO and CO 2 Infrared Analysis of Binary Mixed System
[0118] Thermogravimetric-infrared detection of calcium oxalate, in which calcium oxalate is thermally decomposed, CO and CO in 400-900s 2 Simultaneous release
[0119] Specifically, 20 g of calcium oxalate was loaded on a TGA-FTIR instrument. Heat from 30°C to 900°C at a heating rate of 50°C / min, then hold the sample at 900°C for 5 minutes. Use nitrogen to purge the gas throughout the experiment. The FTIR spectrum of the emitted gas sample was recorded every 6 seconds, and the spectrum of the vapor was collected, resulting in a raw data matrix.
[0120] Then in the MATLAB software, according to the formula (3), data correlation processing is carried out to obtain CO and CO 2 The one-dimensional infrared spectrum and the two-dimensional asynchronous spectrum of the mixture are respectively as figure 2 (B) Curve 2 and figure 2 (A) shown.
[0121] exist figure 2 It can be seen in (A) that there ...
Embodiment 2
[0124] Infrared resolution of embodiment 2 aqueous system
[0125] The thermogravimetric-infrared detection was carried out on the system of water and isopropanol. The boiling points of water and isopropanol were 100°C and 88°C, respectively. Due to the small difference in boiling point, the release curves of the two substances overlapped.
[0126] Specifically, pure water and pure isopropanol and H 2 A mixture of O / isopropanol (31.2 mg, v:v=1:1) was loaded separately on the TGA-FTIR instrument. Each sample was heated from 30°C to 150°C at a heating rate of 30°C / min, and then the sample was held at 150°C for 5 minutes. Use nitrogen to purge the gas throughout the experiment. The FTIR spectrum of the emitted gas sample was recorded every 6 seconds, and the spectrum of the vapor was collected, resulting in a raw data matrix.
[0127] Then in the MATLAB software, data correlation processing is carried out according to the formula (3), and the one-dimensional infrared spectru...
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