A microscale Kjeldahl nitrogen determination for environmental waters

被引：11
作者：
Campins-Falco, P. [1 ]
Meseguer-Lloret, S. [1 ]
Climent-Santamaria, T. [1 ]
Molins-Legua, C. [1 ]
机构：
[1] Univ Valencia, Dept Quim Analit, Fac Quim, E-46100 Valencia, Spain
来源：
TALANTA | 2008年 / 75卷 / 04期
关键词：
microscale; nitrogen Kjeldahl system; ammonium and/or organic nitrogen determination; ammonia electrode; water samples;
D O I：
10.1016/j.talanta.2008.01.037
中图分类号：
O65 [分析化学];
学科分类号：
070302 ; 081704 ;
摘要：
A microscale Kjeldahl system has been designed which has been homemade reduced. The digestor unit of a macroKjeldahl system and a modified glassware microdistillation unit have been used. The optimal conditions for digestion and distillation have been established for ammonium and methylamine as model compound of organic amino nitrogen. The optimised procedure has been applied to the determination of Kjeldahl nitrogen in water samples. Recoveries near 100% and good precision have been achieved. This procedure combines nitrogen miniaturized system and the use of a selective ion electrode for ammonia detection. The analysis time was reduced 4.8 times and the analysis cost 6.6 times compared with classical procedure. The residues generated have been also markedly minimized. A preconcentration factor of 4 instead of 1.5 obtained by the macroscale design has been achieved. (c) 2008 Elsevier B.V. All rights reserved.
引用
收藏
页码：1123 / 1126
页数：4
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