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Determination of Ammonia-N in Environmental Water by Air-segmented FIA
Feng, Yong-Lai,Tian, Li-Ching,Wang, Wei,Wu, Qiao-Znen 한국분석과학회 1995 분석과학 Vol.8 No.4
A method for determination of ammonia-N in environmental water by air-segmented flow injection analysis using the colour reaction of phenol and sodium hypochlorite with ammonia was described in this paper. When the reaction temperature is $70^{\circ}C$ and the reaction residence time is 5 minutes, a sample frequency of $60-90h^{-1}$ can be achieved. The detection limit and relative deviation are $0.05mg.ml^{-1}$ and 4%, respectively. The recovery of this method is 96 - 110%, and the determination results of the method are greatly agreement with standard colorimetric method.