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Hydrophobic probe used for tensiometer

A tensiometer and hydrophobic technology, applied in surface tension analysis, measuring devices, instruments, etc., can solve the problems of inability to measure oil component tension, no oil component capillary pressure, and inability to apply oil component capillary pressure measurement, etc.

Active Publication Date: 2013-09-25
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the probes used for tensiometers are all hydrophilic probes, so they can only measure the tension of water in the soil, but cannot measure the tension of oil, so they cannot be applied to the measurement of capillary pressure of oil
[0006] Therefore, there is currently no effective method for non-destructively measuring the capillary pressure of oil in soil

Method used

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  • Hydrophobic probe used for tensiometer
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  • Hydrophobic probe used for tensiometer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Embodiment 1: the preparation of hydrophobic probe

[0039] In the preparation method of the hydrophobic probe in this embodiment, the following raw and auxiliary materials are used: T5 / T5x pressure sensing tensiometer, silane coupling agent KH570, toluene, concentrated HCl solution, NaOH, ethanol.

[0040] Among them, the T5 / T5x pressure sensing tensiometer can measure the capillary pressure of water in the soil, and its probe is a detachable alumina probe, produced by UMS; the chemical name of the silane coupling agent KH570 is γ-methyl Acryloyloxypropyltrimethoxysilane, the chemical structure is CH 3 CCH 2 COO(CH 2 ) 3 Si(OCH 3 ) 3 , can react with water, density 1.04g / mL, boiling point 255°C, flash point 88°C, purity ≥97.0%, produced by Dow corning company; toluene purity ≥99.9%, produced by Guangzhou Chemical Reagent Factory; concentrated HCl solution purity ≥ 38.0%, produced by Guangzhou Chemical Reagent Factory, prepared into dilute solution by common met...

Embodiment 2

[0051] Embodiment 2: Hydrophobicity test of probe

[0052] The properties of the probes obtained in Example 1 were measured by four methods as follows to verify the effect of the modification.

[0053] (1) Measurement of contact angle

[0054] The measurement method is: use Micromeasure to zoom in and measure the angle (drawing a line on the computer photo for measurement).

[0055] figure 1 It is the situation that water droplets with a diameter of about 2mm fall on the surface of the probe, and the instrument is magnified to observe. One side of the angle formed by the contact between the water droplet and the probe surface; a tangent line to the center of the water droplet is made at one of the boundary contact points to form the other side of the angle. The angle between the two sides is the contact angle between the water droplet and the surface of the probe. A contact angle θ is formed between the ultrapure water droplet and the probe surface, and whether the modif...

Embodiment 3

[0077] Example 3: Hydrophobic tensiometer

[0078] Figure 7 Shown is a pressure-sensing tensiometer model T5 / T5x manufactured by UMS Corporation, including a reference air pressure connection (1), sealed wires (2), sensor body (3), acrylic glass shaft (4), and probe (5 ). Among them, the reference air pressure connection end (1) is used to transmit the reference air pressure to the pressure sensor through the air-permeable PTFE membrane and the wire; the sealed wire (2) can be buried underground if necessary, but its appearance should be protected; the sensor In the main body (3), the built-in piezoelectric pressure sensor can measure the oil component tension in the soil according to the reference air pressure; the shaft length of the acrylic glass shaft (4) can vary from 2 to 20 cm as required; the probe (5) has been implemented After the modification of Example 1, it changed from hydrophilic to hydrophobic. The capillary pressure of oil in soil can be measured non-des...

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Abstract

The invention relates to the field of controlling and restoring underground water pollution, and specifically relates to a hydrophobic probe used for a tensiometer. The hydrophobic probe is prepared by modifying an alumina probe by a mixing solution comprising silane coupling agents and toluene. According to modifying the probe of the pressure sensing tensiometer, hydrophilicity of the probe is converted to hydrophobicity, so that a nondestructive testing is performed on the capillary pressure of oil in soil. A period of validity of hydrophobicity of the modified probe is more than eight months, and the modification method is of low cost and simple operation.

Description

technical field [0001] The invention relates to the field of groundwater pollution control and restoration, in particular to a hydrophobic probe used for a tensiometer. Background technique [0002] Landfill leachate is a major source of groundwater pollution, and the key to controlling and remediating groundwater pollution is to detect and characterize the distribution of pollutants in the soil, so as to determine the location and scale of groundwater pollution prevention and control measures. There are two types of pollutants in groundwater: water-soluble and water-insoluble. Water-soluble pollutants can migrate with water, and the existing hydraulic model can be directly used to determine their distribution; non-water-soluble pollutants are mainly composed of liquid oil, because oil penetrates into the soil and migrates in the aquifer, in pores and low permeability The region exists in the form of fragment residues, presenting a highly irregular distribution. [0003] I...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N13/02G01N13/04
Inventor 李雁吴鹏飞李耀初纪红兵周劲风周丹严文菲
Owner SUN YAT SEN UNIV
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