Soil water content colorimetric-determination method

A soil moisture content and colorimetric measurement technology, applied in the field of soil moisture content measurement, can solve problems such as production troubles, changes in absorption wavelengths, easy moisture absorption, etc., and achieve the effects of reducing procedures and costs, eliminating errors, and high precision

Inactive Publication Date: 2014-02-19
河南农大迅捷测试技术有限公司
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  • Summary
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  • Application Information

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Problems solved by technology

[0006] The colorimetric method for measuring soil moisture has high precision, a large range, and is basically not affected by soil type, bulk density, specific gravity, and chemical composition. However, it has not been effectively promoted for more than 30 years. Species and interconversion (CoCl 2 ·H 2 O(blue-purple)CoCl 2 2H 2 O(fuchsia)CoCl 2 ·6H 2 O (pink) [CoCl 4 ] 2- (blue)); the preparation process of cobalt chloride to remove crystal water needs to be dried at 220°C for 21 hours, which is troublesome to make, and it is easy to absorb moisture during storage after dehydration; the color of the colorim

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0035] A kind of colorimetric determination method of soil moisture content of example 1, comprises the steps:

[0036](1) Chromogen: Weigh 10.000g of cobalt chloride in a 1L volumetric flask, dissolve it with ethanol and set the volume to 1L, shake well for later use, and measure its absorbance;

[0037] (2) Working curve: prepare respectively the standard solution after the color development of 0%, 5%, 10%, 15%, 20%, 25%, 30% water content, and test its absorbance on the spectrophotometer, with The absorbance is the abscissa, and the water content is the ordinate, and the working curve is drawn. The working curve equation is: y=0.2348x 2 -0.6706x+0.5018;

[0038] (3) Weigh about 1.00g of fresh soil sample into a colorimetric tube, draw 10mL of color developer into the colorimetric tube, shake vigorously to disperse the soil, and filter the soil sample to be tested with filter paper in the colorimetric tube. In a color dish, set aside;

[0039] (4) Correct the working curv...

example 2

[0042] Example 2: a kind of colorimetric assay method of soil moisture content, comprises the steps:

[0043] (1) Chromogenic agent: Weigh 3.200g of cobalt chloride into a 1L volumetric flask, dissolve it with acetone and set the volume to 1L, and shake well for later use.

[0044] (2) Working curve: Prepare the standard solutions with water content of 0%, 2%, 4%, 6%, 8%, 10%, 15%, and 20% respectively, and test them on the spectrophotometer Absorbance, with absorbance as the abscissa and water content as the ordinate, draw a working curve. The working curve equation is: y=24.38x 2 -48.374x+23.586.

[0045] (3) Weigh about 2.000g of fresh soil sample into the colorimetric tube, draw 20mL of the color developer into the colorimetric tube, shake vigorously to disperse the soil, and filter the soil sample to be tested with filter paper in the colorimetric tube. In a color dish, set aside.

[0046] (4) Correct the working curve by using the ratio of the absorbance measured by t...

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PUM

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Abstract

The invention relates to a soil water content colorimetric-determination method. The soil water content colorimetric-determination method comprises the following steps of 1, carrying out extraction on a soil sample to be detected by a cobalt chloride hexahydrate organic solution having a concentration of 0.1-30g/L as a color developing agent to remove solids and to obtain a solution to be detected, and determining the absorbance of the solution to be detected at the wavelength of 380-680nm, and 2, searching the corresponding soil water content in a built absorbance-soil water content standard curve according to the absorbance obtained by the step 1, or substituting the absorbance obtained by the step 1 into the built absorbance-soil water content standard curve equation and calculating the corresponding soil water content. The soil water content colorimetric-determination method is not influenced by soil types, components, unit weight and disturbance, has an error ratio below 2% is a pervasive soil moisture content detection method, is suitable for fast determination in the field and is suitable for soil water fast-determination in the laboratory.

Description

technical field [0001] The invention relates to a method for measuring soil water content, in particular to a colorimetric method for measuring soil water content. Background technique [0002] "Building a water-saving society and developing water-saving agriculture" is a major strategic plan of the country. Monitoring changes in farmland moisture and carrying out water-saving irrigation are of great significance to ensuring food security in my country. At present, there are two types of field soil moisture detection methods: distributed embedded monitoring and portable moisture detection. Most of the frequency domain reflection or time domain reflection moisture meters adopt the dielectric principle. Its detection speed is fast and the operation is simple, but the detection accuracy is affected by soil type, composition, bulk density, soil disturbance, etc. For embedded applications, this error can be resolved by comparing it with laboratory methods. For portable applicat...

Claims

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Application Information

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IPC IPC(8): G01N21/31
Inventor 杨张青胡小宁段铁城
Owner 河南农大迅捷测试技术有限公司
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