6533b833fe1ef96bd129c188
RESEARCH PRODUCT
A microscale Kjeldahl nitrogen determination for environmental waters.
Pilar Campíns-falcóS. Meseguer-lloretCarmen Molins-leguaT. Climent-santamariasubject
ChromatographyMethylamineInorganic chemistrychemistry.chemical_elementNitrogenAnalytical Chemistrylaw.inventionIon selective electrodeAmmoniachemistry.chemical_compoundchemistrylawAmmoniumKjeldahl methodDistillationMicroscale chemistrydescription
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.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2008-05-30 | Talanta |