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Method for detecting the content of peroxysulphate

A technology of peroxodisulfate and detection method, which is applied in material analysis by observing the influence on chemical indicators, measurement of color/spectral properties, and analysis by chemical reaction of materials, etc., can solve the problem of narrow application range, human body and environmental hazards, long measurement time, etc., to achieve the effect of wide application, environmental friendliness and high accuracy

Inactive Publication Date: 2019-05-31
BCEG ENVIRONMENTAL REMEDIATION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the analysis process of the iodometric method is complicated, the measurement time is long, and the requirements for the operator's experimental operation level are relatively high.
[0004] Disclosed in the Chinese patent document CN106908439A is a kind of rapid determination method of peroxodisulfate content in the solution, with N,N-diethyl-p-phenylenediamine as indicator, utilize ferrous ion to activate peroxodisulfate to generate sulfate radical free radical, quickly oxidize N,N-diethyl-p-phenylenediamine to generate red free radicals, so as to quickly determine the content of peroxodisulfate in the sample to be tested. The method is simple and easy, and the determination time is short, but the method can be determined The pH range of the peroxodisulfate salt sample is 2.5-6, and the scope of application is relatively narrow. In addition, the toxic substance N,N-diethyl-p-phenylenediamine needs to be added during the determination process, and toxic waste water will be generated during the determination process, which may affect the Hazards to humans and the environment

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  • Method for detecting the content of peroxysulphate
  • Method for detecting the content of peroxysulphate
  • Method for detecting the content of peroxysulphate

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Embodiment 1

[0041] The present embodiment provides a kind of detection method of peroxodisulfate content, comprises the following steps:

[0042] S1. Add 1ml of potassium iodide solution with a concentration of 1.807mmol / L and 1ml of sodium bicarbonate solution with a concentration of 0.148mmol / L into 38ml of deionized water to obtain mixture A, adjust the pH value of mixture A to 4, and measure mixture A The absorbance value at the characteristic absorption wavelength of 352nm is recorded as a; add 0.1ml of sodium peroxodisulfate with a concentration of 0, 2, 5, 8, 10, 20, 50, 100, 150, 200mmol / L to mixture A After the standard sample was reacted at 25°C for 15 minutes, the absorbance value of the reaction mixture at the characteristic absorption wavelength of 352nm was measured respectively, which was recorded as b; the difference between b and a was recorded as ΔA352, and ΔA352 was used as the abscissa. The sodium disulfate standard sample concentration is the ordinate, and the standar...

Embodiment 2

[0048] The present embodiment provides a kind of detection method of peroxodisulfate content, comprises the following steps:

[0049] S1, the sodium iodide solution that 1ml concentration is 1.807mmol / L and the potassium bicarbonate solution that 1ml concentration is 0.148mmol / L are added to 38ml deionized water, obtain mixture A, adjust the pH value of mixture A to be 8, and measure The absorbance value of mixture A at the characteristic absorption wavelength of 352nm is denoted as a; add 0.1ml of peroxide with concentration of 0, 2, 5, 8, 10, 20, 50, 100, 150, 200mmol / L to mixture A respectively Potassium sulfate standard sample, after reacting at 25°C for 15 minutes, measure the absorbance value of the reaction mixture at the characteristic absorption wavelength of 352nm, and record it as b; record the difference between b and a as ΔA352, and use ΔA352 as the abscissa, Take the concentration of potassium peroxodisulfate standard sample as the ordinate to establish a standar...

Embodiment 3

[0055] The present embodiment provides a kind of detection method of peroxodisulfate content, comprises the following steps:

[0056] S1. Add 1ml of potassium iodide solution with a concentration of 1.807mmol / L and 1ml of sodium bicarbonate solution with a concentration of 0.148mmol / L into 38ml of deionized water to obtain mixture A, adjust the pH value of mixture A to 6, and measure mixture A The absorbance value at the characteristic absorption wavelength of 352nm is recorded as a; add 0.1ml of ammonium peroxodisulfate with a concentration of 0, 2, 5, 8, 10, 20, 50, 100, 150, 200mmol / L to mixture A For the standard sample, after reacting at 25°C for 5 minutes, measure the absorbance value of the reaction mixture at the characteristic absorption wavelength of 352nm, and record it as b; record the difference between b and a as ΔA352, take ΔA352 as the abscissa, and use Ammonium disulfate standard sample concentration is the ordinate, establishes the standard curve, the standar...

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Abstract

The invention provides a method for detecting the content of peroxysulphate. By preparing a standard curve, a sample of persulfacte water sample to be tested is added to a mixed solution of an iodideion aqueous solution and a bicarbonate radical aqueous solution, absorbance values of the mixed solution at the feature absorption wavelength before and after the water sample to be tested is added ismeasured, and the difference of the absorbance values before and after the water sample to be tested is added is substituted into the standard curve to calculate and obtain the content of the persulfacte in the water sample to be tested. The method employs the iodide ions in the mixed solution of the dithionate iodine oxide ion aqueous solution and the bicarbonate radical aqueous solution to generate an iodine element, the measurement result is accurate, the application range is wide, no toxic waste water is generated, and the environment is friendly.

Description

technical field [0001] The invention relates to the field of chemical substance content detection, in particular to a detection method for peroxodisulfate content. Background technique [0002] Peroxodisulfate has strong oxidizing properties (E0=1.96v). After activation, it can generate sulfate radicals (E0=2.5~3.1v). In recent years, it has been widely used in the degradation of toxic pollutants, bleaching dyes and extinguishing living aquatic microorganisms. Common methods for activating peroxodisulfate include metal ion activation methods represented by divalent cobalt, monovalent silver and ferrous ions, and CoFe 2 o 4 and CuFe 2 o 4 The heterogeneous activation method represented by spinel magnetic materials, the multi-phase activation method represented by carbon materials such as nano-zero-valent iron, carbon nanotubes and graphene, and the use of visible light radiation, ultraviolet radiation, electron beam radiation and Ultrasonic cavitation, etc. are represent...

Claims

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Application Information

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IPC IPC(8): G01N21/31G01N21/78
Inventor 樊强王晓伟宋倩何玮淑李书鹏郭丽莉
Owner BCEG ENVIRONMENTAL REMEDIATION CO LTD
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