期刊
ANALYTICA CHIMICA ACTA
卷 704, 期 1-2, 页码 146-153出版社
ELSEVIER
DOI: 10.1016/j.aca.2011.07.005
关键词
Spectrophotometric determination; Magnetite nanoparticles; Ammonium; Sulfabenzamide
资金
- Research Council of the University of Mohaghegh Ardabili
A new method was proposed for the determination of ammonium based on the preconcentration with dodecylbenzene sulfonate modified magnetite nanoparticles. Ammonium was oxidized to nitrite by hypobromite and then the nitrite produced was determined spectrophotometrically, using sulfabenzamide and N-(1-naphthyl) ethylenediamine after solid phase extraction. The azo dye produced was desorbed by an appropriate small volume of sodium hydroxide prior to the absorbance measurement. The linear calibration graphs were obtained in the concentration range of 0.03-6.00 ng mL(-1) ammonium. The relative standard deviation and recovery percents were 1.0 and 99.0, respectively, for 1.0 ng mL(-1) ammonium, and the limit of detection was 3.2 ngL(-1) ammonium. The interfering effects of a large number of diverse ions on the determination of ammonium were studied. The method was applied to the determination of ammonium in various types of water resources. The results revealed a high efficiency for the recommended ammonium determination method. (C) 2011 Elsevier B.V. All rights reserved.
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