辽宁省盐碱地利用研究所针对凯氏法的缺点,进行冷加过氧化氢缩短消化时间的对比试验,取得了显著效果。 1979～1981年,经过百余次试验,测定土壤全氮量,在原用硫酸钾、硫酸铜作催化剂,浓硫酸消煮的基础上,冷加1毫升过氧化氢消煮,消煮时间 Liaoning Institute of Saline Use Institute for the shortcomings of Kjeldahl method, cold plus hydrogen peroxide shorten the digestion time comparison test and achieved remarkable results. From 1979 to 1981, after more than one hundred tests, the soil total nitrogen content was determined. Based on the original potassium sulfate and copper sulfate as the catalyst, concentrated sulfuric acid was used for digestion and digestion, 1 mL of hydrogen peroxide was added for digestion and cooling,