In 1883 Johan Kjeldahl developed a system for nitrogen determination in organic substances. Soon after its publication numerous modifications and improvements were made by different chemists. Throughout the years, thousands of different papers have been written on the process, including suggested variations, upgrades, criticisms, and reviews, and many types of devices have been designed for both the digestion and the distillation stages. Since its introduction in 1883, the Kjeldahl method has been an essential analytical tool for nitrogen determination in research, academic and industrial laboratories.
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