Determination of Ammonium, Calcium, Magnesium, and Potassium in Silage by Capillary Isotachophoresis

A method for the simultaneous determination of ammonium, calcium, magnesium, and potassium in silage samples by capillary isotachophoresis was developed. The electrophoretic migration properties of ammonium, calcium, magnesium, potassium, and sodium were investigated in electrolyte systems with lead...

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Published inJournal of agricultural and food chemistry Vol. 45; no. 9; pp. 3554 - 3558
Main Authors Blatny, Pavel, Kvasnicka, Frantisek, Loucka, Radko, Safarova, Helena
Format Journal Article
LanguageEnglish
Published Washington, DC American Chemical Society 01.09.1997
Subjects
AMMONIA
AMMONIAC
AMONIACO
Biological and medical sciences
CALCIO
CALCIUM
ENSILADO
ENSILAGE (PRODUIT)
Feed and pet food industries
Food industries
Fundamental and applied biological sciences. Psychology
MAGNESIO
MAGNESIUM
POTASIO
POTASSIUM
SILAGE
Ammonium
Calcium
Animal feeding
Silage
Simultaneous measurement
Isotachophoresis
Magnesium
Potassium
Capillary tube
Feed
Quantitative analysis
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Summary:A method for the simultaneous determination of ammonium, calcium, magnesium, and potassium in silage samples by capillary isotachophoresis was developed. The electrophoretic migration properties of ammonium, calcium, magnesium, potassium, and sodium were investigated in electrolyte systems with leading electrolytes containing the complexing agent crown ether (18-crown-6). It was determined that the electrolyte system consisting of 0.0075 mol/L sulfuric acid, 0.007 mol/L 18-crown-6, 0.1% hydroxypropymethyl cellulose as leading electrolyte, and 0.01 mol/L Bis-tris-propane as the terminating electrolyte is most appropriate for the determination of cations cited above. The results of this capillary isotachophoresis method were compared with atomic absorption spectroscopy, and both methods were found to be in agreement. The precision of the determination including sample pretreatment, expressed by the relative standard deviations was between 4 and 7% and 10% for calcium, magnesium, potassium, and ammonium, respectively. Detection limits were less than 200 ppm in the solid sample. Keywords: Capillary isotachophoresis; silage; ammonium; calcium; magnesium; potassium; sodium; minerals
Bibliography:1997076239
Q54
istex:901679C2042B3B94EC54D757DBC51A393D8C08C0
ark:/67375/TPS-ZSJV5N0Q-7
Abstract published in Advance ACS Abstracts, April 15, 1997.
ISSN:0021-8561
1520-5118
DOI:10.1021/jf9606767