Kjeldahl flask

A Kjeldahl flask, also known as a digestion flask, is a specialized glassware used in the Kjeldahl method for determining the nitrogen content in organic compounds. It is named after its inventor, the Danish chemist Johan Kjeldahl. The flask is designed to withstand high temperatures and chemical reactions. It typically has a round bottom with a long neck and is made of borosilicate glass. The Kjeldahl flask is used to hold the sample along with a mixture of concentrated sulfuric acid and a catalyst. The flask is heated, which leads to the digestion and oxidation of the organic material, converting the nitrogen into ammonium sulfate. The nitrogen content can then be determined through subsequent titration or other analytical techniques.

凱氏燒瓶又稱消化燒瓶，是一種專用玻璃器皿，用於凱氏定氮法測定有機化合物中的氮含量。它以發明者丹麥化學家約翰-凱氏定氮命名。燒瓶的設計可以承受高溫和化學反應。燒瓶通常是長頸圓底，由硼硅玻璃制成。凱氏燒瓶用來盛放樣品以及濃硫酸和催化劑的混合物。燒瓶加熱後，有機物被消化和氧化，氮轉化為硫酸銨。隨後可通過滴定或其他分析技術確定氮含量。