Method for determining copper ion concentration by means of ionic liquid extraction differential pulse voltammetry

A differential pulse voltammetry and ionic liquid technology, applied in the field of electrochemical analysis and detection, can solve the problems of long operation time, large amount of organic solvent, complicated operation steps, etc., and achieve the effects of high sensitivity, reduced pollution and low detection limit.

Inactive Publication Date: 2018-09-07
GUILIN UNIVERSITY OF TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The traditional method for sample detection (such as spectroscopy, etc.) has disadvantages such as large amount of organic solvent, complicated operation steps and long operation time.

Method used

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  • Method for determining copper ion concentration by means of ionic liquid extraction differential pulse voltammetry
  • Method for determining copper ion concentration by means of ionic liquid extraction differential pulse voltammetry
  • Method for determining copper ion concentration by means of ionic liquid extraction differential pulse voltammetry

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Experimental program
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Embodiment

[0022] (1) Weigh 0.0938 g copper nitrate solid, add deionized water to dissolve completely, transfer to a 50 mL volumetric flask with glass rod drainage, dilute to the mark with deionized water, shake well, and obtain a concentration of 0.01 mol / L Copper nitrate solution, the 0.01 mol / L copper nitrate solution was diluted step by step to obtain a concentration of 6×10 -4 mol / L, 3.6×10 -4 mol / L, 1.8×10 -4 mol / L, 6×10 -5 mol / L, 4.8×10 -5 mol / L, 2.4×10 -5 mol / L and 1.2×10 -5 mol / L series of low-concentration copper ion solutions.

[0023] (2) Pipette 150 μL of the low-concentration copper ion solution prepared in step (1) into seven 1.5 mL centrifuge tubes, and then respectively pipette 600 μL of NH solution with pH=8.0 3 -NH 4 Cl buffer and 150 μL at a concentration of 6×10 -3 mol / L PAN-ethanol solution, shake the centrifuge tube for 15 s and let it stand still.

[0024] (3) Use a pipette gun to pipette 50 μL of ionic liquid 1-butyl-3-methylimidazolium hexafluoro...

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Abstract

The invention discloses a method for determining copper ion concentration by means of an ionic liquid extraction differential pulse voltammetry. The method comprises the steps of firstly, enabling a copper ion solution to react with a PAN-ethanol solution and an NH3-NH4Cl buffer solution with a pH value of 8.0 for 1.5s under the condition of oscillation, and then standing; then, adding 1-butyl-3-methylimidazolium hexafluorophosphate, carrying out a reaction for 6min under the condition of oscillation, and centrifuging to obtain an ionic liquid phase; dripping 30mu L of the ionic liquid phase onto the surface of a glassy carbon electrode for forming a three-electrode system together with a silver wire and a platinum wire, and using the differential pulse voltammetry to realize the determination of the copper ion concentration by means of the ionic liquid extraction differential pulse voltammetry. The linear range of the method for detecting copper ions is 2.0*10<-6>mol / L to 1.0*10<-4>mol / L, a correlation coefficient of a standard curve is R2=0.9964, and a detection limit is 2.41*10<-7>mol / L. The method provided by the invention has good stability and reproducibility, and the ionic liquid is an environment-friendly extracting agent, so that the method has a good prospect for detecting Cu(II).

Description

technical field [0001] The invention belongs to the technical field of electrochemical analysis and detection, in particular to a method for measuring copper ion concentration by ionic liquid extraction differential pulse voltammetry. Background technique [0002] Ionic liquids are evolved from traditional high-temperature molten salts. The main difference between them and traditional liquid substances is that the composition of ionic liquids is completely ionic, and the main difference between them and molten salts is the difference in melting point. Ionic liquids have good solubility to many organic substances and inorganic salts, and have no pollution to the environment, so they are called "green solvents". The advantage of non-volatile ionic liquid ensures that the volume does not change during the extraction process; the advantages of high stability and good conductivity maintain good electrical activity and stable chemical properties during the electrochemical measurem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/48B01D11/04
Inventor 潘宏程郝杰庞光明陈雯朱文远
Owner GUILIN UNIVERSITY OF TECHNOLOGY
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