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Method for measuring content of hydrogen peroxide through low-field nuclear magnetic resonance

A technology of low-field nuclear magnetic resonance and measurement methods, applied in the direction of analysis by nuclear magnetic resonance, etc., can solve problems such as short measurement time, environmental pollution, and poor accuracy of measurement results, and achieve the effect of short detection cycle

Pending Publication Date: 2021-07-16
ANJI MICROELECTRONICS TECH (SHANGHAI) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

CN103712930A discloses a method for quickly measuring hydrogen peroxide content using spectrophotometry, which can realize rapid measurement and does not require expensive instruments, but at the same time, the reaction reagents used are toxic and easily cause environmental pollution and other problems
CN103439323A discloses a method for quickly measuring residual hydrogen peroxide in a test sample by using detection test paper. The method has short measurement time and high sensitivity, but also has the disadvantages of high test paper preparation cost and poor accuracy of measurement results

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  • Method for measuring content of hydrogen peroxide through low-field nuclear magnetic resonance
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  • Method for measuring content of hydrogen peroxide through low-field nuclear magnetic resonance

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Embodiment 1

[0033] First use the standard oil sample to calibrate the low-field NMR; then prepare standard hydrogen peroxide with different concentrations (0.10%, 0.50%, 1.00%, 1.99%, 3.00%, 3.99%), and record the signal values ​​of each concentration with a low-field NMR analyzer Si; take the prepared standard hydrogen peroxide concentration as the abscissa, convert the signal to the ordinate, and draw a Si and Ci scatter diagram; then use a one-dimensional linear equation to fit, calculate the regression equation, and calculate the working curve of hydrogen peroxide.

[0034] The concentration of the standard hydrogen peroxide provided in Example 1 of the present invention and the measured corresponding signal values ​​are recorded in Table 1.

Embodiment 2

[0036] First, a standard oil sample is used to calibrate the low-field NMR; then, standard hydrogen peroxide is added to formula 1, which is a neutral formula solution. Using a low-field nuclear magnetic resonance analyzer, first measure the base signal S0 of the formula when hydrogen peroxide is not added (C=0); For the standard hydrogen peroxide sample, its signal value is recorded as Si respectively; with the concentration of the added standard hydrogen peroxide as the abscissa and the signal value as the ordinate, draw a Si and Ci scatter diagram; Obtain the working curve of hydrogen peroxide; take the sample to be tested, measure its relaxation signal value S, and calculate the corresponding concentration of hydrogen peroxide according to the working curve.

[0037] The concentration of the standard hydrogen peroxide provided in Example 2 of the present invention and the measured corresponding signal values ​​are recorded in Table 2.

Embodiment 3

[0039]First, a standard oil sample is used to calibrate the low-field NMR; then, standard hydrogen peroxide is added to formula 2, which is an alkaline formula solution. Using a low-field nuclear magnetic resonance analyzer, first measure the base signal S0 of the formula (C=0) without adding hydrogen peroxide; then measure a plurality of standard hydrogen peroxide samples with different concentrations (0.155%, 0.488%, 1.003%, 1.963%) , its signal value is denoted as Si respectively; With the concentration of standard hydrogen peroxide added as abscissa, the signal value is ordinate, draw Si and Ci scatter diagram; Working curve: take the sample to be tested, measure its relaxation signal value S, and calculate the corresponding hydrogen peroxide concentration according to the working curve.

[0040] The concentration of the standard hydrogen peroxide provided in Example 3 of the present invention and the measured corresponding signal values ​​are recorded in Table 3.

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Abstract

The invention relates to a method for measuring the content of hydrogen peroxide through low-field nuclear magnetic resonance. The method comprises the following steps of: measuring a plurality of standard hydrogen peroxide samples with different concentrations of Ci by using a low-field nuclear magnetic resonance analyzer, respectively acquiring signal values Si of the standard hydrogen peroxide samples, and drawing a working curve of the standard hydrogen peroxide samples by taking Ci and Si as coordinate values; measuring a sample to be measured by using the low-field nuclear magnetic resonance analyzer to obtain a relaxation signal value S of the sample to be measured; and substituting the relaxation signal value S into the working curve of the standard hydrogen peroxide sample, and calculating to obtain the concentration C of the sample to be detected. Compared with other methods for measuring the content of hydrogen peroxide, the method has the advantages that the testing speed is high, the sample does not need to be pretreated in the testing process, the solvent and the sample do not need to be consumed, the method is safe and environmentally friendly, and the risk that other components in the sample cause the inaccurate concentration result of hydrogen peroxide is avoided.

Description

technical field [0001] The present application relates to the field of hydrogen peroxide content analysis, in particular to an analysis method for measuring hydrogen peroxide content by low-field nuclear magnetic resonance technology. Background technique [0002] The determination methods of hydrogen peroxide mainly include titration, chemiluminescence, chromatography, spectrophotometry, test paper colorimetry, amperometric analysis, etc. The main titration methods are iodometric method and potassium permanganate method. At present, the laboratory uses the potassium permanganate method to determine the accurate concentration of hydrogen peroxide solution. This method is to directly titrate hydrogen peroxide with potassium permanganate standard solution at room temperature with dilute sulfuric acid as the medium and manganese sulfate as the catalyst. When titrating, potassium permanganate itself is used as an indicator to determine the end point of the titration. Although ...

Claims

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Application Information

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IPC IPC(8): G01N24/08
CPCG01N24/08
Inventor 王雨春王春梅
Owner ANJI MICROELECTRONICS TECH (SHANGHAI) CO LTD
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