Method for detecting organic matter content of soil

Abstract

The invention discloses a method for detecting the organic matter content of soil, which comprises: carrying out soil heating digestion pretreatment, placing a sample in a digestion tube containing apotassium dichromate-sulfuric acid digestion solution, and carrying out sealed digestion for 10 min in a preheated COD digester; taking potassium hydrogen phthalate to prepare an organic carbon standard curve; then carryng out colorimetric analysis by adopting a spectrophotometric method, and multiplying the content of organic carbon read from a standard curve by an empirical coefficient to obtainthe content of organic matters in the soil. The method overcomes the defects of a traditional detection mode, adopts a closed digestion mode, improves the stability and accuracy of content detection,improves the digestion efficiency, has no environmental pollution, simplifies the analysis operation steps, enhances the analysis capability of complex samples, and is suitable for batch analysis.

Description

Technical field [0001] The invention relates to a method for detecting the content of soil organic matter. Background technique [0002] Soil organic matter generally refers to the material derived from life in the soil. Soil organic matter is an important component of the solid part of the soil and one of the main sources of plant nutrition. It can promote the growth and development of plants, improve the physical properties of the soil, and promote microorganisms and The activities of soil organisms promote the decomposition of nutrient elements in the soil, and improve the fertility retention and buffering properties of the soil; the content of soil organic matter is an important index to measure soil fertility, and has certain guidance for understanding the status of soil fertility, fertilizing and improving soil significance. [0003] At present, the detection method of organic matter content is heating digestion, then ferrous sulfate titration is used to determine the organi...

AI Technical Summary

Problems solved by technology

The existing heating and digestion methods mainly include (1) electric heating plate and electric sand bath reflux heating, which are difficult to control the temperature of such methods; (2) oil bath reflux heating, which is troublesome to clean and pollutes the analysis environment

Moreover, the above heating methods all have problems such as low heating efficiency, difficulty in batch analysis, complicated procedures, acid mist pollution to the environment, and easy introduction of analysis errors.

[0004] In the existing ferrous sulfate titration method, the color end point of some complex samples is not clear during ferrous sulfate titration, and errors are prone to occur, and ferrous sulfate is easily oxidized, so ferrous sulfate needs to be calibrated before each titration

Therefore, the traditional organic matter content detection pretreatment operation is complicated, the accuracy is poor, and the detection efficiency is low.

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