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Method for measuring concentrations of sulfate, nitrate solutions by utilizing terahertz time-domain spectroscopy

A terahertz time-domain and spectral detection technology, which is applied in the field of solution concentration detection to achieve the effects of good repeatability, simple operation and rapid detection.

Inactive Publication Date: 2013-10-02
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, so far there is no report on the use of terahertz time-domain spectroscopy to detect the concentration of sulfate and nitrate solutions

Method used

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  • Method for measuring concentrations of sulfate, nitrate solutions by utilizing terahertz time-domain spectroscopy
  • Method for measuring concentrations of sulfate, nitrate solutions by utilizing terahertz time-domain spectroscopy
  • Method for measuring concentrations of sulfate, nitrate solutions by utilizing terahertz time-domain spectroscopy

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Embodiment 1

[0039]The present embodiment provides a method for detecting the concentration of copper sulfate solution using terahertz time-domain spectroscopy, which includes the following steps:

[0040] 1. Select the sample cell: the sample cell used is a polyethylene film with a thickness of 0.12mm.

[0041] 2. Preparation of standard copper sulfate solution: Mix copper sulfate and deionized water in proportion to prepare a standard copper sulfate solution of known concentration. The concentration of the standard copper sulfate solution increases sequentially from pure water to saturated solution, respectively copper sulfate / Deionized water = 4g / 100g, 8g / 100g, 10g / 100g, 12g / 100g, 14g / 100g, 16g / 100g, 18g / 100g.

[0042] 3. Detection of standard copper sulfate solution: Use a transmission terahertz time domain spectrometer to detect each standard copper sulfate solution, use the terahertz time domain waveform of the empty sample cell as the reference signal, and use the terahertz time do...

Embodiment 2

[0054] This embodiment provides a method for detecting the concentration of potassium sulfate solution using terahertz time-domain spectroscopy. The operation steps are exactly the same as in Embodiment 1, except that the sample to be tested is potassium sulfate solution of unknown concentration. Wherein, the absorption coefficient spectrogram of standard potassium sulfate solution is shown in Figure 4 .

Embodiment 3

[0056] This embodiment provides a method for detecting the concentration of ammonium sulfate solution using terahertz time-domain spectroscopy technology. The operation steps are exactly the same as in Embodiment 1, except that the sample to be tested is an ammonium sulfate solution of unknown concentration. Among them, the absorption coefficient spectrogram of standard ammonium sulfate solution is shown in Figure 5 .

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Abstract

The invention relates to a method for measuring concentrations of sulfate, nitrate solutions by utilizing the terahertz time-domain spectroscopy. The method comprises the following steps: sample cells are selected, standard solution samples with different concentrations are prepared, terahertz time-domain spectra of the standard solution samples are measured, a terahertz time-domain spectra database of the standard solution samples is built, and the database comprises time-domain spectra, frequency-domain spectra, relation spectra of concentrations and absorption coefficients, relation spectra of concentrations and refractive indexes, relation spectra of concentrations and extinction coefficients of the standard solution samples. Terahertz time-domain spectra of the solutions to be measured are measured, the data is processed to obtain absorption coefficients of the solutions to be measured, and according to the terahertz time-domain spectra database of the standard solution samples, the concentrations of the solutions to be measured are analyzed and determined. The method utilizes the terahertz time-domain spectroscopy to measure solution concentrations, and is advantaged by simple operations, rapid measurement, simple data processing procedures, good repeatability, and high accuracy of results.

Description

technical field [0001] The invention relates to a method for detecting the concentration of sulfate and nitrate solutions by using terahertz time-domain spectroscopy, and belongs to the technical field of solution concentration detection. Background technique [0002] The determination of solution concentration is an extremely important indicator in analysis and detection, and it is one of the main parameters to characterize the characteristics of medium solution. Sulfate and nitrate solutions are widely used in chemical, pharmaceutical and other industries. The detection of their concentration is Many quality inspection departments are one of the indispensable links for product classification and quality control. [0003] Terahertz wave (terahertz, THz) refers to electromagnetic waves with a frequency in the range of 0.1-10THz, which is between microwave and infrared. The characteristics make terahertz non-destructive testing technology have important applications in many ...

Claims

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Application Information

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IPC IPC(8): G01N21/35
Inventor 赵昆李倩
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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