Continuous flow instrumentation for the automated measurement of ammonium and nitrate was developed at University of California, Davis. The method has been refined and adapted for routine analyses. Soil samples are extracted in 2N KCl and the extracts are mixed with an alkali solution to liberate ammonia (NH3). The instrument has two channels for simultaneous measurements of ammonia and nitrate. Reduction of nitrates to ammonia takes place in one channel. The amount of ammonia in each channel is then measured by a diffusion-conductivity method in which the ammonia gas is diffused through a micro-porous Teflon tube and then redissolved in water to form ammonium hydroxide. The measured conductivity of the ammonium hydroxide is directly related to the ammonium content of the samples. The method is both rapid and reliable.
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其它主题
Conductivity; Nitrate nitrogen; Carlson method; Rapid methods; Determination
语言
英语
注释
Paper presented at the 1995 international symposium on soil testing and plant analysis: quality of soil and plant analysis in view of sustainable agriculture and the environment held august 5-10, 1995, wageningen, the netherlands.
2019-12-05
类型
Journal Article; Text
2024-02-28
2026-02-03
MODS