Method for conveniently and rapidly determining total nitrogen content in organic material

A technology for the rapid determination of organic materials, applied in the field of analytical chemistry, can solve the problems of expensive instruments and equipment, difficult to be widely used in ordinary laboratories and production units, and time-consuming, and achieve significant economic and social benefits and convenient and quick determination.

Inactive Publication Date: 2012-09-19
FUJIAN AGRI & FORESTRY UNIV
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Problems solved by technology

The traditional method for determining the total nitrogen content of organic materials is the Kjeldahl method, which requires a special Kjeldahl instrument, and the steps are cumbersome and time-consuming
Mode

Method used

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Examples

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Embodiment Construction

[0021] Instruments and equipment: oven, mortar, precision electronic balance, large test tube, test tube clamp, alcohol lamp, plastic head dropper, Erlenmeyer flask, alkaline burette;

[0022] Pharmaceutical reagents (percentages refer to mass fraction): more than 95% concentrated sulfuric acid, 30% hydrogen peroxide, distilled water, acid-base indicator, 30%~50% sodium hydroxide solution, 2%~5% sulfuric acid, 0.5%~1% hydrogen Sodium oxide solution, 0.1%~0.2% dilute sulfuric acid, 1:1 neutral formaldehyde solution, standard sodium hydroxide solution.

[0023] (1) Pretreatment of organic materials: Dry organic materials at 70°C to 110°C to constant weight, and measure their moisture content. Grind the dried material into a fine powder with a mortar and pestle. After the material powder is dried again, use a precision electronic balance to accurately weigh 0.05-0.20 grams (accurate to 0.0001 grams) of organic materials and add them to a large test tube.

[0024] (2) Sulfuric a...

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Abstract

The invention relates to a method for determining element content of substances, in particular to a method for conveniently and rapidly determining total nitrogen content in an organic material including the content of the organic nitrogen and the content of inorganic nitrogen. The method mainly adopts a concept for combining the digestion with sulfuric acid and titration of ammonia ion with formaldehyde, so that the three steps of alkalization distillation, absorption with boric acid and acid titration in a kjeldahl determination method can be omitted, and equipment, instruments and chemical reagent used in the method are ordinary, so that the determination of the total nitrogen content in the organic material becomes convenient and rapid, and remarkable economic benefit and social benefit can be realized.

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 total nitrogen content in organic materials. Background technique [0002] In the process of production practice, the total nitrogen content of organic materials is a very important factor. The traditional method for determining the total nitrogen content of organic materials is the Kjeldahl method, which requires a special Kjeldahl instrument, and the steps are cumbersome and time-consuming. Modern instruments for determining the total nitrogen content of organic materials are relatively fast, but the equipment is expensive and difficult to be widely used in ordinary laboratories and production units. Contents of the invention [0003] The purpose of the present invention is to provide a convenient and rapid method for determining the total nitrogen c...

Claims

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Application Information

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IPC IPC(8): G01N31/16G01N31/22
Inventor 刘斌肖正黄一帆赵超
Owner FUJIAN AGRI & FORESTRY UNIV
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