A method for detecting water-soluble potassium in saline-alkali soil

A technology for saline-alkali soil and water-soluble potassium, which is applied in measurement devices, color/spectral characteristic measurement, sampling, etc., can solve the problem of high test results, and achieve the effect of being suitable for promotion, good reproducibility and low reliability.

Inactive Publication Date: 2011-12-21
NORTHEAST INST OF GEOGRAPHY & AGRIECOLOGY C A S
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Problems solved by technology

When adopting routine analysis method [1] to analyze soluble potassium in soil, test resul

Method used

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  • A method for detecting water-soluble potassium in saline-alkali soil

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[0012] Example 1 The present invention provides a method for detecting water-soluble potassium in saline-alkali soil. The steps and conditions are as follows: 8 saline-alkali soil samples were taken in Daan County, Zhenlai County, and Taipingchuan Town in Jilin Province, of which 1, 2 Taken from Da'an County, 3, 4, and 5 are taken from Zhenlai County, and 6, 7, and 8 are taken from Taipingchuan Town. The measured results are shown in Table 2.

[0013] 1 Experimental equipment and analytical instruments

[0014] Atomic absorption spectrophotometer, Australian product, model GBC-906; water bath heating oscillator.

[0015] 2 Processing of saline soil samples:

[0016] 2.1 Weigh 50g of the air-dried saline-alkali soil sample through a 2mm mesh, put it into a dry 500mL Erlenmeyer flask, add 250mL of distilled water, plug in the Erlenmeyer flask, and shake for 3min to obtain a suspension of the saline-alkali soil sample ;

[0017] 2.2 Then filter or centrifuge the suspension of the saline...

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Abstract

The invention provides a method for detecting water-soluble potassium in saline-alkali soil, which includes preparation of soil leaching solution, treatment of leaching solution and atomic absorption spectrometry analysis. In the saline-alkali soil leachate of the present invention, after colloid coagulation and precipitation, the leachate becomes clear and transparent, the interference of colloid particles is avoided, the light absorption value is reduced, and the measured result is closer to the real value. The reproducibility of the measurement results of the method of the present invention is good. The total equivalent concentration of anions and cations, the anion concentration is the sum of the equivalent concentrations of CO32-, HCO3-, Cl-, and SO42-, and the equivalent concentration of cations is the sum of the equivalent concentrations of Ca2+, Mg2+, Na+, and K+ ions. Theoretically speaking, the anion equivalent concentration sum and the cation equivalent concentration sum should be close to the eight ions in the soil. The cation equivalent concentration sum measured by the method of the present invention is close to the anion concentration sum, and the result is closer to the real value. The method of the invention is simple and practical, has low cost and is suitable for popularization.

Description

technical field [0001] The invention relates to a method for detecting water-soluble potassium in saline-alkali soil. Background technique [0002] At present, more and more attention has been paid to the control of saline-alkali soil in our country. The basic composition analysis of saline-alkali soil is the basis of scientific research and directly affects the conclusion of scientific research. Among them, potassium is an essential nutrient element for plant growth. Therefore, the role of potassium in the study of saline-alkali soil management is particularly important. The analysis of soluble potassium in soil mainly uses detection steps such as water immersion, filtration, and instrumental analysis, but in actual analysis, due to the large difference in the composition of the soil, the analysis method directly affects the analysis results. Saline-alkali soil refers to soil that is both salinized and alkaline. my country is mainly distributed in the inland arid and semi-...

Claims

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Application Information

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IPC IPC(8): G01N21/31G01N1/26
Inventor 张玉霞王国平王超英
Owner NORTHEAST INST OF GEOGRAPHY & AGRIECOLOGY C A S
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