Analysis of Diazonium Salts of Aliphatic Compounds with Automatic Nitrogen Analyzer

For the nitrogen compounds contained in organic compounds, the method of nitrogen determination is basically adopted, but the method of nitrogen determination can be divided into two types: nitrogen method and ammonia method. The application of the former can accurately reflect the nitrogen content of fats and aromatic amino compounds. The application of the KDN-08A automatic nitrogen determination instrument is not the reaction to the above, but the ammonia released from the salt heated after the diazotization. Conduct the analysis.

KDN-08A automatic nitrogen determination instrument features: First add acetic acid and sodium nitrite solution into the decanting bottle D from the addition funnel A. The generated nitrogen oxide gas drives away the air in the decomposition system. Vibrating the bottle with a vibrator at room temperature to decompose the diazonium salt into nitrogen. The mixed gas of nitrogen oxide and nitrogen gas generated is pressurized with the liquid addition funnel A into the upper portion of the nitrogen tube F. Then, the bottle of gas in the amount of nitrogen tube was pressed into the earball C to absorb the nitrogen oxide gas, and the residual nitrogen was measured by the KDN-08A. The operating error is above 5%.

For the more stable diazonium salt in the aromatic amino compound, the nitrogen determination method that can be decomposed after heating must be adopted, and another automatic nitrogen determination instrument is used. The characteristics of the KDN-08A nitrogen determination instrument are: Before measuring nitrogen, the air in the entire analysis system must be strictly driven by carbon dioxide. During the operation of injecting diazonium salt from the separatory funnel A into the decomposing flask B, air cannot be allowed to leak. The nitrogen gas heated and decomposed by the diazonium salt must all be driven into the nitrogen tube C.

The requirements for carbon dioxide content in the automatic nitrogen determination test are very pure. Before each sample test, the blank constant of carbon dioxide must be made. When the amino group is diazotized, sodium nitrite cannot be excessive, or the generated nitrogen oxide gas cannot be absorbed by the potassium hydroxide solution in the amount of nitrogen tube, resulting in an increase in the volume of nitrogen gas. The amount of temperature difference in the nitrogen tube is also greater.

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