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Method for measuring clay dispersion average binding free energy and adsorption free energy to cation

A metal cation and soil technology, which is applied in the field of measuring the average binding free energy and average adsorption free energy of soil clay particles to cations, and can solve the problems that the experimental determination of the energy relationship between soil and ions has not really solved.

Inactive Publication Date: 2009-07-08
INST OF SOIL SCI CHINESE ACAD OF SCI
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0004] Half a century later, the experimental determination of the energy relationship between soil and ions remains unresolved

Method used

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  • Method for measuring clay dispersion average binding free energy and adsorption free energy to cation
  • Method for measuring clay dispersion average binding free energy and adsorption free energy to cation
  • Method for measuring clay dispersion average binding free energy and adsorption free energy to cation

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Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0046] The present invention will be further described below in conjunction with accompanying drawing and example.

[0047] Preparation of soil samples and suspensions

[0048] The soil clay particles with a particle size of -1 (if the concentration is 10g L -1 ) suspension, after ultrasonic dispersion, vibrate at constant temperature 1-2 times a day, and measure the Wien effect after 7-10 days of equilibrium.

[0049] measuring device

[0050] The device used to measure the Wien effect in soil suspension consists of a pulse variable high-voltage DC power supply and a conductivity cell, the output DC voltage is as high as 30kV; the pulse width is several μS to tens of μS; the resistance of the conductivity cell can be measured in the range of 1~20kΩ.

[0051] Measurement methods

[0052] Put the measuring device in a constant temperature room, pour the balanced soil suspension into the conductivity cell at a constant temperature (25°C), start from the lowest applied voltag...

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Abstract

The method for measuring the average binding free energy and average adsorption free energy of soil clay particles to cations includes: a. preparing soil clay particles with a particle size of <2 μm and saturated with cations, and then preparing a soil suspension with deionized water or distilled water; b. Place the soil suspension under an electric field with an initial field strength ≤ 15kV cm-1, and gradually increase the field strength, measure the conductivity of the soil suspension under each field strength, and obtain the conductivity and field strength of the soil suspension c. Calculate the average binding free energy and adsorption free energy of soil clay particles to cations according to the following mathematical formulas: ΔGbo=RTln(2CEC Cp λ / EC0) (4); ΔGad=RTln(EC / EC0 ) (8); in the formula, R is the gas constant; T is the thermodynamic temperature; CEC is the cation exchange capacity, Cp is the concentration of soil clay particles in the suspension; λ is the equivalent conductance of dissociated cations; EC0 is the field strength ≤ 15kV Conductivity of the suspension under an electric field of cm-1; EC is the conductivity of the suspension under an electric field of field strength >15kV·cm-1.

Description

technical field [0001] The invention belongs to a new technology in the field of plant nutrition chemistry and environmental protection technology, and relates to a new method for measuring the average binding free energy and average adsorption free energy of soil clay particles to cations. Wien effect. Background technique [0002] By measuring the average binding free energy and average adsorption free energy of soil clay to cations, we can speculate on the storage capacity of the soil for nutrient ions and the availability of nutrients, the activity of polluting ions in the soil and the difficulty of detoxification measures. Therefore, providing an effective method for measuring the average binding free energy and average adsorption free energy of soil clay particles to ions has always been a problem that soil scientists, especially those in the fields of fertility regulation, soil remediation, and environmental protection, want to solve. [0003] Marshall (1950) propose...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/06G01N1/28
Inventor 王玉军李成保周东美王卫姜军
Owner INST OF SOIL SCI CHINESE ACAD OF SCI
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