NSAW Automatic Kjeldahl Distillation System NSAW-1390

NSAW Automatic Kjeldahl Distillation System NSAW-1390 is a laboratory apparatus used for the determination of nitrogen content in organic compounds. The system is named after its inventor, Johan Kjeldahl, a Danish chemist who developed the method in the late 19th century. The Kjeldahl method is widely used in the food and agricultural industries to determine the protein content in food products, animal feed, and fertilizers.

The Kjeldahl distillation system consists of three main components: a digestion unit, a distillation unit, and a titration unit. The digestion unit is used to digest the sample in a mixture of concentrated sulfuric acid and a catalyst, usually copper sulfate. The digestion process breaks down the organic compounds in the sample and converts the nitrogen into ammonium sulfate.

After digestion, the sample is transferred to the distillation unit, where the ammonium sulfate is distilled using steam. The distillate is collected in a receiving flask containing a known amount of boric acid solution. The boric acid solution reacts with the ammonium sulfate to form boric acid ammonium salt, which is then titrated with a standard solution of sodium hydroxide.

The titration unit is used to determine the amount of nitrogen in the sample by measuring the volume of sodium hydroxide required to neutralize the boric acid ammonium salt. The nitrogen content is then calculated using a conversion factor based on the molecular weight of nitrogen.

The Kjeldahl distillation system is a reliable and accurate method for determining the nitrogen content in organic compounds. However, it is a time-consuming process that requires skilled technicians and specialized equipment. In recent years, alternative methods such as the Dumas method have been developed, which offer faster and more automated nitrogen analysis. Nevertheless, the Kjeldahl method remains a widely used and accepted standard in many industries.

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