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Method for improving recovery rate determination stability of Kjeldahl azotometer

A Kjeldahl nitrogen analyzer and Kjeldahl nitrogen determination technology, applied in the preparation of test samples, chemical analysis by titration, etc., can solve problems such as excessive deviation of recovery rate

Inactive Publication Date: 2021-01-12
GUANGDONG YONGSHUNTAI (NINGBO) MALT CO LTD
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Problems solved by technology

[0004] The invention provides a method for improving the stability of the determination of the recovery rate of the Kjeldahl nitrogen analyzer, which can solve the problem of excessive deviation of the recovery rate

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  • Method for improving recovery rate determination stability of Kjeldahl azotometer

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Embodiment Construction

[0019] The technical solutions in the embodiments of the present invention will be clearly and completely described below.

[0020] The present invention relates to a kind of method for improving the stability of Kjeldahl azotometer recovery rate measurement, comprising the following steps:

[0021] S1: Dry ammonium sulfate with a purity >99.5% at 102°C for 4 hours, then cool in a desiccator;

[0022] S2: Weigh 2.0000g (value accurate to four decimal places) of cooled ammonium sulfate, put it in a 500ml volumetric flask, dissolve it with nitrogen-free distilled water, and set the volume to 500ml;

[0023] S3: Use a 20ml pipette to pipette 20ml of the above ammonium sulfate solution into the digestion tube to prepare 5 samples;

[0024] S4: Select the available nitrogen analysis mode on the FOSS automatic Kjeldahl nitrogen analyzer to perform titration analysis on the above samples, obtain the available nitrogen data, compare with the theoretical value, and calculate the blank...

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Abstract

The invention relates to a method for improving the recovery rate determination stability of a Kjeldahl azotometer, which comprises the following steps: drying ammonium sulfate with the purity of morethan 99.5% at 102 DEG C for 4 hours, and cooling in a dryer; weighing 2.0000 g of cooled ammonium sulfate, putting the ammonium sulfate into a 500 ml volumetric flask, dissolving the ammonium sulfatewith nitrogen-free distilled water, and fixing the volume to 500 ml; transferring 20ml of the ammonium sulfate solution into a digestion tube by using a 20ml transfer pipette, and preparing five samples; selecting a nitrogen analysis mode on the Kjeldahl azotometer to perform titration analysis on the sample to obtain nitrogen data, comparing the nitrogen data with a theoretical value, and calculating to obtain a blank value; after the blank value of the instrument is set, using the samples with the same quantity for detection again, and calculating the recovery rate according to test data ofmultiple groups of samples. The problem that the recovery rate deviation is too large can be solved.

Description

technical field [0001] The invention relates to the field of protein determination by the Kjeldahl method, in particular to a method for improving the stability of the Kjeldahl azotometer recovery rate determination. Background technique [0002] The Kjeldahl method is used to determine protein by using the nitrogen-containing organic matter to be tested to be oxidized into carbon dioxide and water when it is co-heated with concentrated sulfuric acid, while the nitrogen is converted into ammonia, and the ammonia is combined with sulfuric acid to form ammonium sulfate. The recovery rate can be quickly determined by using the stable, known and no-digestion characteristics of the ammonium sulfate content, and the distillation system of the Kjeldahl nitrogen analyzer can be verified. [0003] The current method for determining the recovery rate of the Kjeldahl nitrogen analyzer is to dry ammonium sulfate with a purity >99.5% at 102°C for 4 hours, then cool it in a desiccator,...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N31/16G01N1/44
CPCG01N31/16G01N1/44
Inventor 邬风雷
Owner GUANGDONG YONGSHUNTAI (NINGBO) MALT CO LTD