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土壤有机质的测定是土壤分析中最基本的项目之一。土壤有机质含量多少,是土壤肥力高低的重要指标。其测定方法,目前在我国广泛应用的为丘林法(重铬酸钾外加热法),此法需用油浴或磷酸浴加热,操作也较麻烦,加之加热的温度、时间、试管处于油浴中的位置难以准确控制一致,而易产生测定误差,同时在170～180℃高温下,油会气化,造成空气污染,在条件设备差的实验室,污染严重。Walkley Black提出的土壤有机质的水合热测定法,是利用浓硫酸迅速注入重铬酸钾水溶液中,产生的水合热量来促进土壤有机碳的氧化,不需要另外加热。操作简便,快速,精密度高,与丘林法有良
Determination of soil organic matter is one of the most basic items in soil analysis. Soil organic matter content, is an important indicator of soil fertility. The determination method, currently widely used in China for the method of hillock (potassium dichromate external heating method), this method requires oil bath or phosphoric acid bath heating, the operation is more trouble, combined with the heating temperature, time, the tube in oil Bath position difficult to accurately control the same, and easy to produce measurement error, while at 170 ~ 180 ℃ high temperature, the oil will gasification, resulting in air pollution, poor conditions in the laboratory equipment, serious pollution. The hydrometallurgy method proposed by Walkley Black for soil organic matter uses concentrated sulfuric acid to rapidly inject hydrated heat into the aqueous potassium dichromate solution to promote the oxidation of soil organic carbon without additional heating. Easy to operate, fast, high precision, good courage and law