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Isotope Kjeldahl determination analyzer

A nitrogen determination instrument and isotope technology, which is applied in the direction of chemical analysis by titration method, can solve the problem of inability to meet accurate determination, and achieve the effects of simple structure, reduced cross-contamination, and easy installation and maintenance.

Inactive Publication Date: 2013-07-10
HEBEI ACADEMY OF AGRI & FORESTRY SCI INST OF GENETICS & PHYSIOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The cross-contamination of the general Kjeldahl azotometer is about 1%. After the improvement of many scholars at home and abroad, the cross-contamination is reduced to about 0.1%, but it still cannot meet the requirements of accurate measurement.

Method used

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  • Isotope Kjeldahl determination analyzer

Examples

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Comparison scheme
Effect test

Embodiment 1

[0020] As shown in accompanying drawing 1, a kind of isotope Kjeldahl azotometer, it comprises digestive tube 1, distiller 2, condenser 4 and Erlenmeyer flask 5, and described digestive tube 1 is connected with described distiller 2 by sealing plug 10 , the distiller 2 is connected to the condenser 4 through a steam pipe 3, and the lower end of the condenser 4 goes deep into the Erlenmeyer flask 5, and the distiller 2 has an integrated structure, including an outer wall, an inner cavity 6, and The steam outlet pipe 9 communicating with the inner cavity 6 and the inlet tube insertion cavity 7 passing through the outer wall and the inner cavity 6 and communicating with the digestive tube 1, the inlet tube insertion cavity 7 is inserted with lye and steam inlet tube 8. The inner wall of the inlet pipe insertion cavity 7 and the outer wall of the lye and steam inlet pipe 8 are provided with threads, and are assembled together by threads to increase the sealing effect. The digesti...

Embodiment 2

[0025] Utilize the isotope Kjeldahl nitrogen analyzer described in embodiment 1 to 15 N% is 0.366% natural ammonium sulfate and 15 The labeled ammonium sulfate with N% of 50.190% was measured alternately 6 times, and then measured by ZHT-03 gas isotope mass spectrometer 15 N%, the test results obtained are as follows:

[0026] standard material standard value 15 N% measured value 15 N% Cross-contamination% natural ammonium sulfate 0.3663 0.3794±0.0016 0.0270±0.0032

[0027] In conclusion, the isotope Kjeldahl nitrogen analyzer provided by the present invention can achieve the effect of accurate determination of samples and reduce errors.

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Abstract

The invention aims at providing an isotope Kjeldahl determination analyzer which is characterized in that a distiller main body is in an integral structure, can reduce cross contamination, and can meet the requirement of continuous and accurate determination on a 15N isotope. The isotope Kjeldahl determination analyzer is low in cross contamination, high in cooling efficiency, convenient to mount and maintain, long in service life and simple in structure, and the material is corrosion-resistant.

Description

technical field [0001] The invention relates to an isotope Kjeldahl nitrogen analyzer. Background technique [0002] The Kjeldahl nitrogen analyzer is a commonly used analytical instrument in the field of scientific research. 15 Pre-treatment equipment for N isotope analysis, but at present, when Kjeldahl nitrogen analyzers at home and abroad are used for isotope analysis, the samples need to be cleaned to reduce the impact of cross-contamination, so the operation is cumbersome and inefficient, and secondary cross-over may occur pollute. [0003] The cause of cross-contamination is mainly due to the cross-contamination between samples caused by the pipeline adsorption of Kjeldahl nitrogen analyzer distillation. The cross-contamination of the general Kjeldahl azotometer is about 1%. After the improvement of many scholars at home and abroad, the cross-contamination is reduced to about 0.1%, but it still cannot meet the requirements of accurate measurement. Therefore, furthe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N31/16
Inventor 高占锋张建斌黄志国付才王红云常志强刘春发
Owner HEBEI ACADEMY OF AGRI & FORESTRY SCI INST OF GENETICS & PHYSIOLOGY
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