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Infrared spectrum non-linear modeling quantitative anslysis method

A technology of infrared spectroscopy and quantitative analysis, applied in the field of quantitative analysis, can solve problems such as large errors, achieve the effect of reducing measurement errors and improving measurement accuracy

Inactive Publication Date: 2009-02-18
HUAIYIN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When resonance is formed, the change trend at a specific wavelength (wavenumber) is obviously nonlinear. If the traditional linear equation is used to establish a standard curve model, the error is obviously large

Method used

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  • Infrared spectrum non-linear modeling quantitative anslysis method
  • Infrared spectrum non-linear modeling quantitative anslysis method
  • Infrared spectrum non-linear modeling quantitative anslysis method

Examples

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example 1

[0022] Example 1: Determination of water content in aspirin by infrared spectroscopy nonlinear modeling method

[0023] ① Samples and reagents: Aspirin enteric-coated tablets (commercially available), KBr analytically pure;

[0024] ② Instruments: Nicolet 5700 Fourier transform infrared spectrometer (Thermo ELECTRONCORPORATION), YP-2 tablet press (Shanghai Shanyue Scientific Instrument Co., Ltd.), HW-10 infrared drying oven (Gongyi Yingyu Yuhua Instrument Factory), 1810-B Type quartz automatic double pure water distiller (Danyangmen Quartz Glass Factory, Jintan City), KQ-250B ultrasonic cleaner (Dianshanhu Town, Kunshan City, Jiangsu Province), AY120 electronic balance (SHIMADZUCORPORATION JAPAN).

[0025] ③Parameters of infrared spectrometer: number of scans 32 times; resolution 4cm -1 ;Data interval 1.926cm -1 ; Light source IR; scanning spectrum range 4000 ~ 400cm -1 ; detector DTGSKBr;

[0026] ④ Aspirin (Aspirin) tablet moisture content determination method: infrared ...

example 2

[0039] Example 2: Determination of sugar content in tomatoes by infrared spectroscopy

[0040] ①Samples and reagents: tomato, commercially available; glucose, analytically pure; KBr analytically pure;

[0041] ② Instruments: Nicolet 5700 Fourier transform infrared spectrometer (Thermo ELECTRONCORPORATION), YP-2 tablet press (Shanghai Shanyue Scientific Instrument Co., Ltd.), HW-10 infrared drying oven (Gongyi Yingyu Yuhua Instrument Factory), 1810-B Type quartz automatic double pure water distiller (Jintan City Danyangmen Quartz Glass Factory), KQ-250B type ultrasonic cleaner (Dianshanhu Town, Kunshan City, Jiangsu Province), AY120 electronic balance (SHIMADZUCORPORATION JAPAN);

[0042] ③Infrared spectrometer parameters: scan times 32; resolution 2; data point interval 0.964cm -1 ; Light source IR; scanning spectrum range 4000 ~ 400cm -1 ; Detector DTGS KBr; ④ Determination method of sugar content: infrared spectroscopic analysis KBr tablet method, the quantitative results ...

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Abstract

The invention discloses an infrared spectrum non-linear modeling quantitative analysis method based on the molecular vibration theory; the method makes use of Matlab software programming and Statistica software data processing to establish a non-linear model and obtain the final quantitative result through the model. Through the establishment of the non-linear model, the invention realizes quantitative analysis and reduces measurement error to improve the measurement accuracy, precision and feasibility.

Description

technical field [0001] The invention relates to a quantitative analysis method, in particular to an infrared spectrum nonlinear modeling quantitative analysis method. Background technique [0002] Infrared spectroscopy is often used for qualitative analysis. The infrared spectrum is derived from the vibration of molecules, and the molecular vibration causes the change of the dipole moment. The greater the change of the dipole moment, the greater the infrared absorption intensity. When the polar group vibrates, it is accompanied by a large dipole moment change, resulting in strong infrared absorption. Different groups have different positions of absorption fronts, which have obvious characteristics. Such as 1540~2500cm -1 The frequency region is generally the vibration frequency region of the unsaturated group. The typical carbon-carbon double bond C=C absorption peak is at 1600-1700cm -1 And 3000~3100cm -1 Nearby, the typical hydroxyl-OH absorption peak is at 1000-1200...

Claims

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Application Information

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IPC IPC(8): G01N21/35G01J3/42
Inventor 张恒许兆棠
Owner HUAIYIN INSTITUTE OF TECHNOLOGY
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