Study on Soil Nitrogen Content by Automatic Kjeldahl Nitrogen Detector
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The automatic Kjeldahl nitrogen analyzer is generally accepted by various laboratories for the determination of soil total nitrogen and feed crude protein. Although there are many advanced automatic or semi-automatic Kjeldahl analyzers that can achieve automatic distillation and automatic titration, due to the severe soil salinity in the 10 arid regions and the lack of nitrogen, the operating force method and the amount of each reagent are used. Different from the general force method, based on this, the method of automatic Kjeldahl determination of total nitrogen content in soils in arid areas was studied and the influencing factors in the experiments were studied for scientific research, experimental teaching and production practice. Provides an economic, environmental, and time-saving method for measuring nitrogen content.
The optimization of the method for the determination of total nitrogen content in the soil of the ten arid areas was carried out by the automatic Kjeldahl apparatus. The optimum amount of sulfuric acid was 10-15mI, and the organics were completely dissolved at 30 minutes. Na()H The consumption volume of standard solution is set at 50mI, and the general content of nitrogen in the soil in the ten drought-aquiced areas is (0.260±0.003)%. Using the improved Kjeldahl method, the digestion device can shorten the digestion time, save the use of reagents, and significantly reduce the emission of gases such as COz, SOz, SO, which is economical and environmentally friendly.