A method for the determination of organic matter in soil

A method of determination and organic matter technology, which is applied in the direction of chemical analysis by titration and preparation of test samples, etc. It can solve the problems of cumbersome experimental steps, prone to danger, oil drop splashing, etc., and achieve good data reliability and accuracy. , reduce the cost of experiment consumption, and improve work efficiency

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

There are many deficiencies in this method. First, oil is flammable, and the use of an oil bath increases the unsafe factors in the laboratory; Drops splash and are prone to danger; in this method, the sample is first digested with a large test tube, and then transferred to the triangular flask for titration. The large test tube with sticky oil is troublesome to clean, and the experimental steps are cumbersome; in addition, the method is costly and time-consuming. Industry standard LY / T1237-1999)

Method used

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  • A method for the determination of organic matter in soil
  • A method for the determination of organic matter in soil

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Embodiment 1

[0022] Example 1 The present invention provides a pretreatment method for organic matter, which is the determination of organic matter in soil samples.

[0023] (1) Sample weighing: Weigh 5 parts of 0.1g air-dried soil samples passed through a 100-mesh sieve by the subtraction method (accurately weighed to 0.0001g), and place them in 150mL triangular flasks respectively; add powdered silver sulfate respectively 0.1g, use a quantitative pipette to accurately add 5.00mL of potassium dichromate standard solution with a concentration of 0.8000mol / L, and then add 5mL of concentrated sulfuric acid with a concentration of 18mol / L with a pipette, and rotate to shake well;

[0024] (2) Digestion: put a small funnel on each triangular flask and place it on a preheated sand bath, heat the solution to boil for 5 minutes, then remove the triangular flask; Add distilled water to 50mL, then remove the small funnel;

[0025] (3) Titration: Add 3-4 drops of o-phenanthroline indicator to each ...

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Abstract

The invention provides a method for measuring organic matter in soil, which uses a sand bath instead of an oil bath for heating, so that the measurement process is safer; experimental steps are simplified, work efficiency is improved, and experimental consumption costs are reduced. The method for measuring organic matter in soil provided by the invention has a relative standard deviation of 2.86%, and better data reliability and accuracy; the relative standard deviation of the existing method is 3.56%. The invention provides a method for measuring organic matter in soil, and the measuring accuracy is improved by 19.94%.

Description

technical field [0001] The invention relates to a method for measuring organic matter in soil, which is suitable for the determination of organic matter in soil. Background technique [0002] The determination of organic matter in soil is to accelerate the oxidation of organic matter by heating and digesting in an oil bath, so that the carbon in the soil organic matter is oxidized into carbon dioxide, and the dichromate ion is reduced to trivalent chromium ion, and the remaining potassium dichromate is used with dichromate Titration of standard solution of iron valence. According to the change in the number of potassium dichromate ions before and after organic carbon is oxidized, the content of organic carbon or organic matter can be calculated. Oxidation correction factor 1.1 was used to calculate organic matter content. There are many deficiencies in this method. First, oil is flammable, and the use of an oil bath increases the unsafe factors in the laboratory; Drops sp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N31/16G01N1/28G01N1/44
Inventor 张玉霞张少庆王国平
Owner NORTHEAST INST OF GEOGRAPHY & AGRIECOLOGY C A S
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