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近年来靛酚法定氮在国内外已广泛应用。在测定方法上有的提出加催化剂,但是需在水浴里加热几十分钟或放置2小时发色,有的需在不断搅拌或萃取后发色。对土壤样品中干扰离子的消除,有的提出用酒石酸盐作掩蔽剂,但有的依旧用蒸馏分离,有的用沉淀分离过滤后发色,操作较麻烦。本文采用大剂量酒石酸盐掩蔽干扰离子,在室温条件下(10—30℃)快速发色(只需3分钟)其吸光度可稳定1小时。本方法直接用于土壤中氮的测定,其测试范围:0.01—1％,回收率:96-
In recent years, indophenol nitrogen has been widely used at home and abroad. Some methods in the determination of the proposed catalyst, but need to heat the water bath for tens of minutes or placed 2 hours color, and some need to continue stirring or extraction after the color. Elimination of interfering ions in soil samples, some have proposed the use of tartrate as a masking agent, but some are still separated by distillation, and some separated by filtration and precipitation after the precipitation, the operation is more troublesome. In this paper, high doses of tartrate to mask interfering ions, rapid color development (only 3 minutes) at room temperature (10-30 ℃) its absorbance can be stable for 1 hour. The method is directly applied to the determination of nitrogen in soil, the test range: 0.01-1%, recovery: 96-