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Quantitative method for solute in water based on Raman spectrum background deduction

A Raman spectroscopy, solute technology, applied in Raman scattering, material excitation analysis, etc., can solve the problems of easy introduction of more errors, poor reproducibility, large changes in peak intensity, etc., to achieve scientific and reasonable design and simplification Calculation steps, the effect of improving accuracy

Active Publication Date: 2022-03-15
JIANGSU OCEAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

When measuring homogeneous substances such as liquids, under the same experimental conditions such as laser power and exposure time, quantitative analysis using the Raman characteristic peak intensity of the object to be measured is easily affected by various factors such as laser power and equipment fluctuations. Influence, so the reproducibility is not good, will reduce the accuracy of quantitative analysis
[0003] The Raman characteristic peak intensity of a substance is used as an internal standard to calculate the Raman characteristic peak intensity of the analyte and the known Raman characteristic peak intensity, and the method of establishing a standard curve related to concentration and ratio after calculating the intensity ratio needs to be treated The Raman characteristic peak of the measured object and the known object is fitted to obtain its intensity. After multiple fittings, it is easy to introduce more errors, especially when the Raman characteristic peak of water is used as the internal standard, the Raman characteristic spectrum of water is more complicated. , and the peak intensity changes greatly due to the influence of salinity and pH, so the results of quantitative analysis of liquids are inaccurate

Method used

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  • Quantitative method for solute in water based on Raman spectrum background deduction
  • Quantitative method for solute in water based on Raman spectrum background deduction
  • Quantitative method for solute in water based on Raman spectrum background deduction

Examples

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Embodiment 1

[0057] After sodium sulfate is dissolved in water, sodium sulfate exists in the aqueous solution in the form of sodium ions and sulfate ions, and the Raman characteristic spectrum peak shape of water does not change. Quantitative analysis of sulfate in sodium sulfate aqueous solution is suitable for containing In the Raman spectrum of the aqueous solution of the solute, there is no change in the Raman characteristic spectrum of water and the Raman characteristic spectrum of pure water.

[0058] The method for quantifying solutes in water based on Raman spectrum background subtraction provided by this embodiment specifically includes the following steps:

[0059] Step 1: Measure and obtain the Raman spectrum L of pure water 0 ,Such as figure 1 shown.

[0060] Step 2: configure the aqueous sodium sulfate solution of 839mg / L, measure and obtain the Raman spectrum L of the aqueous sodium sulfate solution of 839mg / L 1 ,Such as figure 2 shown.

[0061] Step 3: Take L 0 As a s...

Embodiment 2

[0068] This embodiment provides a method for quantifying solutes in water based on Raman spectrum background subtraction. This quantitative method is applicable to the Raman characteristic spectrum of water and the Raman characteristic spectrum of pure water in the Raman spectrum of aqueous solutions containing solutes. Changes, specifically include the following steps:

[0069] 1) Measure and obtain the Raman spectrum L of pure water 0 ;

[0070] 2) The preparation concentration is N 0 The aqueous solution of solute P, the Raman characteristic spectrum of water in the aqueous solution of solute P is identical with the Raman characteristic spectrum of pure water;

[0071] 3) The measured concentration is N 0 Raman spectrum of an aqueous solution of solute P L 3 ;

[0072] 4) with L 0 As a subtrahend, L 3 As the minuend, choose the appropriate minuend coefficient a 1 and subtrahend factor b 1 , the L 3 The signal strength corresponding to a specific Raman frequency sh...

Embodiment 3

[0087] This example is basically the same as Example 2, except that the solvent water is replaced by ethanol.

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Abstract

The invention belongs to the technical field of Raman spectrum substance detection, and particularly relates to a quantitative method for solute in water based on Raman spectrum background deduction, the quantitative method is used for detecting the solute in an aqueous solution by a Raman spectrum method and quantitatively analyzing the concentration C of the solute; taking the Raman characteristic spectrum of the pure water as a subtrahend of deduction, taking an aqueous solution containing the solute as a minuend, adjusting the coefficient to obtain the Raman spectrum of the aqueous solution of the solute of a Raman characteristic peak without water, then solving the Raman characteristic peak intensity of the solute, and calculating to obtain the standard intensity. And establishing a relational expression according to the standard strength and the concentration of the solute of the water solution with the known solute concentration, and substituting the standard strength of the solute of the water solution with the unknown solute concentration into the relational expression to calculate the concentration of the solute. The method is scientific and reasonable in design, only the Raman characteristic peak intensity of the solute needs to be obtained, and the accuracy of quantitative analysis of the solute in water is improved.

Description

technical field [0001] The invention belongs to the technical field of Raman spectrum substance detection, and in particular relates to a method for quantifying solutes in water based on Raman spectrum background subtraction. Background technique [0002] The measurement of Raman spectroscopy has the characteristics of accurate qualitative, non-destructive, non-contact, and can detect a variety of mixed substances, and can be applied to solid, liquid, gas detection and other fields. When measuring homogeneous substances such as liquids, under the same experimental conditions such as laser power and exposure time, quantitative analysis using the Raman characteristic peak intensity of the object to be measured is easily affected by various factors such as laser power and equipment fluctuations. Therefore, the reproducibility is not good, which will reduce the accuracy of quantitative analysis. [0003] The Raman characteristic peak intensity of a substance is used as an inter...

Claims

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Application Information

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IPC IPC(8): G01N21/65
CPCG01N21/65
Inventor 黄保坤赵倩男朱琳张鸿
Owner JIANGSU OCEAN UNIV