Measuring device and measuring method of flowing potential coefficient and zeta potential

A streaming potential and measuring device technology, applied in measuring devices, material analysis through electromagnetic means, instruments, etc., to achieve the effects of convenient filling, avoiding leakage, and avoiding pressure measurement errors

Active Publication Date: 2021-10-26
SOUTHWEST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Aiming at the deficiencies of the above-mentioned prior art, the present invention provides a streaming potential coefficient measuring device to solve the technical problem of relying on constant pressure to measure streaming potential in the prior art

Method used

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  • Measuring device and measuring method of flowing potential coefficient and zeta potential
  • Measuring device and measuring method of flowing potential coefficient and zeta potential
  • Measuring device and measuring method of flowing potential coefficient and zeta potential

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Effect test

Embodiment 1

[0065] Using the device of the present invention, the zeta of quartz sand mineral particles with a particle size of 0.42 to 0.85 mm and surface modified (coated with iron hydroxide) quartz sand mineral particles in different pH electrolyte solutions were measured according to the above-mentioned instrument operation steps. potential. The Fe content per kilogram of iron-coated quartz sand is 4.95g. The sample amount of quartz sand or iron-coated quartz sand required for each measurement is 8.80g. The pH values ​​of the electrolyte solutions used were 4.4, 5.2, 6.1, 6.6, 6.9, 7.7, 8.0, and the conductivity of the solutions were all 20 μS cm -1 . Follow the measurement procedure above for sample measurement. Hydraulic differential correction is performed first, followed by streaming potential measurement, followed by conductivity determination. The zeta potentials of the finally calculated quartz sand and iron-coated quartz sand in electrolyte solutions with different pH valu...

Embodiment 2

[0067] The device of the present invention is used to measure the zeta potential of quartz sand mineral particles with a particle size of 0.42-0.85 mm in electrolyte solutions with different ionic strengths according to the above-mentioned instrument operation steps. The sample amount of quartz sand or iron-coated quartz sand required for each measurement is 8.80g. The electrolyte solutions with different ionic strengths used were 0.01, 0.05, 0.1, 0.5, 1.0, 2.0, 5.0 mmol·L -1 of NaCl solution. Carry out sample measurement according to the above-mentioned measurement steps, first perform hydraulic pressure difference correction, then conduct streaming potential measurement, and then conduct conductivity determination. Finally, the zeta potential of quartz sand in different ionic strength electrolyte solutions is obtained as Figure 5 shown. It can be seen that in electrolyte solutions with different ionic strengths, the measured zeta potential of quartz sand is negative, but...

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Abstract

The invention discloses a measuring device and method for measuring flow potential coefficient and zeta potential. When the time is poor, the liquid in the liquid storage container can flow into the sample addition container by gravity, and both the liquid storage container and the sample addition container can drain through the three-way valve; the sample addition container has a sample addition chamber and a measurement chamber. The present invention relies on gravity to transmit the liquid, without additional pumping device, and the change of the hydraulic pressure difference in the sample container caused by the liquid falling under the action of gravity can be measured through the hydraulic pressure difference measurement interface of the first measurement chamber and the second measurement chamber, then When measuring streaming potential, it is only necessary to know the drop height of the liquid level to know the streaming potential under the measured hydraulic pressure difference, and it is not necessary to maintain a constant pressure difference during the streaming potential measurement process. The measurement process is continuous and efficient, realizing the integrated measurement of streaming potential coefficient and zeta potential.

Description

technical field [0001] The invention relates to the technical field of surface electrochemical measurement. Background technique [0002] The streaming potential refers to the phenomenon that the potential difference is generated when the electrolyte solution flows through the capillary pores formed between the charged surfaces. When the electrolyte solution passes through the charged capillary or porous medium under the action of external force (ΔP), the ions in the diffusion layer of the electric double layer formed on the charged surface will also move with it, forming a flowing current (Is). At the same time, due to the electrostatic interaction between the charged surface of the solid phase and the ions in the electrolyte, the ions in the electrolyte solution with the opposite sign of the solid phase charge will accumulate along the flow direction of the electrolyte solution, thereby generating a potential difference (ΔE) at both ends of the capillary or porous media. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/416
CPCG01N27/4166
Inventor 李忠意程永毅
Owner SOUTHWEST UNIV
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