Method for conveniently and quickly determining nitrogen content of plant material

A rapid determination and plant technology, applied in the field of analytical chemistry, can solve the problems of not considering the effect of organic nitrogen loss on color development, cumbersome configuration of digestion solution, long digestion time, etc., to achieve easy mastery, saving reagents, and accurate results Effect

Inactive Publication Date: 2013-11-27
FUJIAN AGRI & FORESTRY UNIV
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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

Method used

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Examples

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Embodiment Construction

[0042] In the present invention, a specific implementation method of the present invention is further described by taking the giant Juncao sample as an example, and the present invention includes but is not limited to the following examples. The following examples are preferred embodiments of the present invention, and all equivalent changes and modifications made according to the scope of the patent application of the present invention shall be covered by the present invention.

[0043]Equipment: precision electronic balance (accurate to 0.0001 g), oven, mortar, graduated test tube, test tube clamp, alcohol lamp, plastic dropper, pipette gun, spectrophotometer (measurement wavelength range includes 420nm) and pH test paper, The scale value of the graduated test tube is 20ml.

[0044] Pharmaceutical reagents (percentages refer to mass fractions): more than 95% concentrated sulfuric acid, 30% hydrogen peroxide, and distilled water. The reagents to be prepared include urea organ...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/78G01N21/31
Inventor 刘斌肖正赵超刘晓艳黄一帆
Owner FUJIAN AGRI & FORESTRY UNIV
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