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A method for detecting dissolved organic matter in water by combining three-dimensional fluorescence spectroscopy with quadratic differential

A technology of dissolved organic matter and three-dimensional fluorescence, which is applied in the direction of fluorescence/phosphorescence, material analysis through optical means, and measurement devices, can solve the problems of parallel factor analysis method failure and unreliable analysis results, and achieve accurate results and processing efficiency high effect

Active Publication Date: 2021-03-30
BEIHANG UNIV
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Problems solved by technology

However, when the number of samples is too small, or the fluorescence peaks of the samples are too different from each other, the parallel factor analysis method will fail, and the analysis results will become unreliable

Method used

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  • A method for detecting dissolved organic matter in water by combining three-dimensional fluorescence spectroscopy with quadratic differential
  • A method for detecting dissolved organic matter in water by combining three-dimensional fluorescence spectroscopy with quadratic differential
  • A method for detecting dissolved organic matter in water by combining three-dimensional fluorescence spectroscopy with quadratic differential

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Embodiment 1

[0045] The above method was used for the fluorescence spectrum analysis of commercially pure humic acid (Sigma Aldrich, St.Louis, MO, USA), and the validity and reliability of the traditional parallel factor analysis and the second differential analysis were compared.

[0046](1) Dissolve 0.40 g of humic acid in 400 mL of potassium hydroxide (0.05 M) to prepare a humic acid stock solution. The pH of the humic acid stock solution was adjusted to about 8 with 0.1 M hydrochloric acid. The humic acid stock solution was filtered through a 0.45 μm membrane to remove suspended particles. Obtain humic acid stock solution with initial TOC concentration of 318.2mg / L.

[0047] (2) Dilute the humic acid stock solution to 3ppm, and measure the three-dimensional fluorescence spectrum data. During the measurement, the emission and excitation wavelengths are both 200-600nm, the voltage is 700V, the step size is 5nm, and the scanning speed is 1200nm / min. The three-dimensional fluorescence s...

Embodiment 2

[0054] The above method was used for fluorescence spectrum analysis of Taihu Lake water samples, and the consistency of traditional parallel factor analysis and quadratic differential analysis was compared.

[0055] (1) Filter the Taihu Lake water sample with a 0.45 μm filter membrane, and measure its TOC value to be less than 10 ppm. The three-dimensional fluorescence spectrum was measured after diluting the water sample twice.

[0056] (2) During measurement, the excitation wavelength range is 200-450nm, the emission wavelength range is set at 220nm-550nm, the voltage is 700V, the step size is 5nm, and the scanning speed is 1200nm / min.

[0057] (3) Apply this method and the traditional parallel factor molecule to the original data of the three-dimensional fluorescence spectrum of the Taihu Lake water sample, the results are as follows Figure 5 as shown, Figure 5 The results of the parallel factor analysis are shown in the small figures at the four corners. The Taihu Lake...

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Abstract

The invention discloses a method for detecting soluble organic matters of a water body by combining a three-dimensional fluorescence spectrum and secondary differentiation, which comprises the following steps of: 1, measuring the three-dimensional fluorescence spectrum of a water body by a fluorescence spectrometer, and acquiring the three-dimensional fluorescence spectrum data of ultraviolet to visible light wave bands; 2, removing Raman and Rayleigh scattering peaks of the three-dimensional fluorescence spectrum; step 3, performing secondary full differential treatment on the three-dimensional fluorescence spectrum; and making the positive value after the secondary full differential processing become zero; 4, carrying out correlation analysis on the TOC value of the soluble organic matter and the secondary full differential value of the fluorescence spectrum, and obtaining the correlation relationship between the TOC value of the soluble organic matter with different characteristicsand the peak value of the fluorescence spectrum, and realizing rapid detection of the species and concentration of the organic maters in the water body. The method has no requirement on the quantity of the sample and has the advantages of high sensitivity, no damage to the sample, simple operation, convenient popularization and application and the like.

Description

technical field [0001] The invention belongs to the technical field of environmental engineering waste water quality detection, in particular to a method for detecting dissolved organic matter in a water body by combining three-dimensional fluorescence spectrum with secondary differential. Background technique [0002] Dissolved organic matter occurs in a variety of aquatic ecosystems and is defined as a complex and heterogeneous mixture comprising compounds with a wide range of molecular weights and chemical properties. As an important indicator of water quality, solubility is critical for metal toxicity, soil biological activity, and wastewater treatment performance. Therefore, the study of the properties of dissolved organic matter in water is a major topic in the field of environment. [0003] At present, three-dimensional fluorescence method is widely used in the determination of dissolved organic matter in water. However, because the peaks of various types of phospho...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/64
CPCG01N21/6402
Inventor 柳姝范文宏左金星张优
Owner BEIHANG UNIV
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