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Method for measuring ion strength of substance

A technology of ionic strength and material, applied in the field of chemical engineering, can solve the problems of large ionic strength error and long time, and achieve the effect of simple operation, avoiding range limitation, and economical operation

Active Publication Date: 2012-10-03
CHNA ENERGY INVESTMENT CORP LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The present invention aims to provide a method for measuring the ionic strength of a substance, so as to solve the technical problems such as large ionic strength error and long time in the measurement process of the ionic strength in the prior art

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  • Method for measuring ion strength of substance
  • Method for measuring ion strength of substance

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Embodiment approach

[0022] According to a typical embodiment of the present invention, the method for measuring the ionic strength of a substance comprises the following steps: preparing the substance solution to be tested as a microdispersed droplet emulsion by a liquid-liquid microdispersion method; sending the microdispersed droplet emulsion into an electric field for determination electrophoretic mobility; and obtaining the ionic strength of the microdispersed droplet emulsion according to the value of the electrophoretic mobility.

[0023] The invention prepares the microdispersed droplet emulsion through the liquid-liquid microdispersion method, measures the electrophoretic mobility of the microdispersed droplet emulsion under the action of an electric field, and obtains the ionic strength of the microdispersed droplet emulsion according to the numerical value of the electrophoretic mobility. The invention provides an accurate and effective method for measuring the ionic strength of a soluti...

Embodiment 1

[0040] (1) Establish electrophoretic mobility-ionic strength linear regression equation

[0041] Preparation of standard potassium chloride solution: prepare a series of potassium chloride standard solutions with molar concentrations of 0.1mmol / L, 0.25mmol / L, 0.50mmol / L, 0.75mmol / L, and 1.00mmol / L, according to The ionic strength is equal to half of the sum of the items obtained by multiplying the molar concentration of each ion in the solution by the square of the ion valence, and calculates the ionic strength of the reference potassium chloride solution. The ionic strength of the reference potassium chloride solution and its molar concentration Consistent, respectively: 0.1mmol / L, 0.25mmol / L, 0.50mmol / L, 0.75mmol / L, 1.00mmol / L.

[0042] The above-mentioned reference potassium chloride solution is formulated into a reference microdispersion droplet emulsion: dodecane (molar concentration is 5 × 10 -4 mol / L) and methanol according to the mass percentage of 1:1000 to obtain a ...

Embodiment 2

[0052] (1) Establish electrophoretic mobility-ionic strength linear regression equation

[0053] Preparation of standard potassium nitrate solution: configure a series of potassium nitrate standard solutions with molar concentrations of 0.1mol / L, 0.25mol / L, 0.50mol / L, 0.75mol / L, and 1.00mol / L, according to the ionic strength equal to each The molar concentration of the ion is multiplied by the half of the sum of the items obtained by the square of the ion valence, and the ionic strength of the reference potassium nitrate solution is calculated. The ionic strength of the reference potassium nitrate solution is consistent with its molar concentration, which is respectively: 0.1mmol / L, 0.25mmol / L, 0.50mmol / L, 0.75mmol / L, 1.00mmol / L.

[0054] The above-mentioned reference potassium nitrate solution is formulated into a reference microdispersion droplet emulsion: hexadecane (molar concentration is 70×10 -4 mol / L) and acetone according to the mass percentage of 6:1000 to obtain a ...

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Abstract

The invention discloses a method for measuring ion strength of a substance. The method comprises the following steps of: preparing the solution of a substance to be detected into micro-dispersion liquid drop emulsion by a liquid-liquid micro-dispersion method; sending the micro-dispersion liquid drop emulsion into an electric field to measure the electrophoretic mobility; and obtaining the ion strength of the micro-dispersion liquid drop emulsion according to the value of the electrophoretic mobility. The method is accurate, economical and effective in measuring the ion strength of solution. The measuring method is simple in operation, economical and practical, and the defect of range limitation during the traditional measuring process of ion strength is avoided. The method is applicable to solution with different viscosity systems, and is widely applied to the measurement of ion strength of solution in the oil and chemical industry.

Description

technical field [0001] The invention relates to the technical field of chemical engineering, in particular to a method for measuring the ionic strength of a substance. Background technique [0002] Ionic strength is a measure of the electric field strength generated by the ions in the solution. The greater the concentration of ions in the solution, the greater the number of charges carried by the ions, the stronger the interaction between the ions and other ions, and the greater the ionic strength. The ionic strength of the current solution generally uses an electrochemical sensor and then uses the membrane potential to measure the activity or concentration of ions in the solution. A membrane potential is generated that is directly related to the activity of this ion. The selective electrode for measuring ionic strength is also called membrane electrode. This type of electrode has a special electrode membrane. The electrode membrane has a selective response to specific ions...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/447
Inventor 吴勇夏婷婷吴月芳
Owner CHNA ENERGY INVESTMENT CORP LTD
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