Method for detecting organic matter in soil

Abstract

The invention relates to measurement for organic substances in soil, in particular to a method for measuring organic substances in soil. The method comprises the following steps: using a digestion instrument to replace a heating device; using a digestion tube to replace a conical flask to receive samples and reagent solution; covering a small funnel with a bent part above the digestion tube when heating; timing from boiling of the solution; taking down the digestion tube after 6 to 8 minutes; cooling the digestion tube; and using sodium diphenylamine sulphonate as indicator to titrate residual K2Cr2O4. The method has the advantages of good repeatability, high reproducibility, simplicity and practicability.

Description

A method for measuring organic matter in soil technical field The invention relates to the determination of organic matter in soil, in particular to an improved method for measuring soil organic matter. Background technique Soil organic matter is the main source of various nutrients in the soil, especially nitrogen and phosphorus. It can make the soil have fertility and buffer properties, loosen the soil and form a structure, thereby improving the physical and chemical properties of the soil. It is the basis for soil classification. one. In addition, the biological characteristics of the soil will also change with the quantity and quality of soil organic matter. Therefore, organic matter content is usually used as an important indicator of soil fertility level (Document 1: Laojiata. Soil Agrochemical Analysis Handbook [M]. Beijing: Agricultural Press, 1988: 229-236; Document 2: Wen Xiaoqi. Soil Organic Matter Research Method [M]. Beijing: Agricultural Press, 1984: 19-37;...

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Problems solved by technology

However, with the continuous improvement of modern scientific testing methods and the enhancement of people's awareness of environmental protection, analysis operators are increasingly aware of the inadvisability of the oil bath heating method: (1) The oil is volatile during the heat conduction process and pollutes the laboratory air, Affect the health of the operator; (2) if heated with an open flame, it is easy to ignite the volatile oil and cause a fire hazard; (3) the heating temperature fluctuates greatly, which affects the oxidation efficiency of the sample; (4) it is difficult to Cleaning, and in the cleaning process, if you accidentally bring the oil dirt outside the tube into the tube, resulting in high measurement results

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