Method for conveniently and quickly determining nitrogen content of plant material

Abstract

The invention relates to a method for determining element content, in particular to a method for conveniently and quickly determining the nitrogen content of plant material. Aiming at that the plant material is high in organic carbon content and nitrogen mainly exists in an organic nitrogen form, the method provided by the invention combines the conceptions of concentrated sulfuric acid digestion, hydrogen peroxide decolorization, Nessler's agent coloration and standard curve comparison, eliminates three steps of alkalified distillation, boric acid absorption and acidometric titration in the kjeldah method, and is used for determining the nitrogen content of the plant material with the combination of a Nessler's agent spectrophotometric method, the operation is simple, instruments are simple, the agent is easy to obtain, the determination of the nitrogen content of the plant material is enabled to be convenient and fast, moreover, the security is high, the results are accurate, the agent is saved, environmental protection is achieved, and remarkable social and economic benefits are obtained.

Description

technical field [0001] The invention belongs to the field of analytical chemistry, and relates to a method for measuring the content of material elements, in particular to a method for conveniently and quickly measuring the nitrogen content of plant materials. [0002] Background technique [0003] The traditional method for determining the nitrogen content of plant materials is the Kjeldahl method, which requires a special Kjeldahl instrument, and the steps are cumbersome and time-consuming. Modern instruments and equipment for determining the total nitrogen content of organic materials are expensive, cumbersome to maintain, and require high storage conditions, so they are difficult to be widely used in ordinary laboratories and production units. Gu Changhong introduced in the article "Determination of Total Nitrogen in Soil by Microwave Digestion - Nessler's Reagent Spectrophotometry" (Journal of Chongqing Technology and Business University (Natural Science Edition), Volu...

AI Technical Summary

Problems solved by technology

This method is cumbersome to configure the digestion solution, takes a long time to digest, consumes a lot of lye, and requires a special Kjeldahl nitrogen analyzer digestion and distillation device

Both of these methods directly use ammonium ions as the standard curve of Nessler's reagent, without considering the loss of organic nitrogen during the determination process and the influence of other components in the digestion solution on the color development of Nessler's reagent