Determination of ammonium in river water and sewage samples by capillary zone electrophoresis with direct UV detection.
We developed capillary zone electrophoresis (CZE) with direct UV detection for determination of ammonium in environmental water samples. Ammonium in the samples was partly converted into ammonia in the alkaline background electrolyte (BGE) during migration and was detected by molecular absorption of ammonia at 190 nm in approximately 7 min. The limit of detection (LOD) for ammonium was 0.24 mg/l (as nitrogen) at a signal-to-noise ratio of three. The respective values of the relative standard deviation (RSD) of peak area, peak height, and migration time for ammonium were 2.1, 1.8, and 0.46%. Major alkali and alkaline earth metal ions coexisting in the samples did not interfere with ammonium determination by the proposed method. The proposed method determined ammonium in surface water and sewage samples. The results were compared to those obtained using ion chromatography (IC).
Fukushi
Keiichi
K
Faculty of Maritime Sciences, Kobe University, 5-1-1 Fukaeminami-machi, Kobe 658-0022, Japan. fukushi@maritime.kobe-u.ac.jp
Ito
Hideyuki
H
Kimura
Kenichi
K
Yokota
Kuriko
K
Saito
Keiitsu
K
Chayama
Kenji
K
Takeda
Sahori
S
Wakida
Shin-ichi
S
D002138:Calibration; D019075:Electrophoresis, Capillary / Q000379:methods*; D006863:Hydrogen-Ion Concentration; D000644:Quaternary Ammonium Compounds / Q000032:analysis*; D012680:Sensitivity and Specificity; D012722:Sewage / Q000737:chemistry*; D013056:Spectrophotometry, Ultraviolet / Q000379:methods*; D014867:Water / Q000737:chemistry*
D000644:Quaternary Ammonium Compounds; D012722:Sewage; D014867:Water