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Method for determining concentration of phosphite by cyclic voltammetry

A technology of cyclic voltammetry and phosphite, applied in the direction of electrochemical variables of materials, can solve problems such as long time, and achieve the effect of simple experimental conditions

Inactive Publication Date: 2011-08-03
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Paper chromatography, thin-layer chromatography and classical ion-exchange chromatography require a long time in the separation and detection process

Method used

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  • Method for determining concentration of phosphite by cyclic voltammetry
  • Method for determining concentration of phosphite by cyclic voltammetry
  • Method for determining concentration of phosphite by cyclic voltammetry

Examples

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Embodiment 1

[0023] The method for determining the concentration of phosphite by cyclic voltammetry:

[0024] (1) Configure sulfuric acid solutions (5g / L, 10g / L, 15g / L, 20g / L, 25g / L, 30g / L) containing different concentrations of sodium phosphite as standard solutions, and the concentration of sulfuric acid is 0.5mol / L ;

[0025] (2) Utilize the electrochemical workstation to measure the prepared standard solution, the measurement conditions are: the working electrode is a Pt electrode, the auxiliary electrode is a platinum wire, the reference electrode is a saturated calomel electrode, the scanning speed is 500mV / s, and the scanning voltage range is -0.2V~1.2V, scan forward, draw the relationship between the logarithm of the oxidation peak of the phosphite electrode and the logarithm of its concentration (ln I~ln C), establish the working curve, and obtain the linear fitting formula ln I=1.72438+ 0.58806 ln C;

[0026] (3) Dissolve the sample to be tested or its diluted sample in sulfuri...

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Abstract

The invention discloses a method for determining the concentration of phosphite by cyclic voltammetry, which comprises the steps of: establishing a working curve by determining the quantitative proportional relation between the oxide peak current intensity of phosphite on a bare Pt electrode and the concentration of phosphite and fitting the working curve as a linear formula, and substituting theoxide peak value of a sample to be detected in the formula to obtain the concentration of phosphite. The method of the invention is accurate in detection results, has the advantages of being simple in experimental conditions, simple and convenient in operation and saving time compared with the traditional methods for determining the concentration of phosphite, such as an oxidation reduction titration method, a paper chromatography, a thin-layer chromatography and an ion exchange chromatography, and has tremendous popularization and application prospect in paint, electroplating and other fields.

Description

technical field [0001] The invention relates to a method for determining the concentration of phosphite, in particular to a method for determining the concentration of phosphite by cyclic voltammetry. Background technique [0002] Phosphite is widely used in paint and other industries, and it is necessary to detect its concentration. In addition, phosphite can also appear as a by-product in electroless plating. In the electroless plating industry, hypophosphite baths are generally used. As the electroless plating progresses, the concentration of phosphite will increase, resulting in a decrease in the electroless plating speed, deterioration of the mechanical properties of the precipitated metal, deterioration of the coating film, and self-decomposition of the plating solution. Therefore, the determination of the concentration of phosphite is very important for the production control of electroless plating, the regeneration of aging solution and the treatment of waste solut...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/48
Inventor 刘汝涛池振兴疏雪峰
Owner SHANDONG UNIV
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