DIN EN ISO 14637:2007 Edition
$24.05
Milch – Bestimmung des Harnstoffgehaltes – Enzymatisches Verfahren mit pH-Änderung (Referenzverfahren)
Published By | Publication Date | Number of Pages |
DIN | 2007-03 | 16 |
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Urease wird der Untersuchungsprobe zugefügt, um Harnstoff in Ammoniak und Kohlendioxid zu spalten. Bei einem pH Wert von 6,7 hydrolysiert Ammoniak unter Freisetzung von Hydroxylionen sofort und Kohlendioxid setzt Protonen frei, die die Hydroxidionen teilweise neutralisieren. Das Gleichgewicht zwischen der Ammoniak- und Kohlendioxid-Hydrolyse und die daraus resultierende Neutralisation führen zu einer Änderung des pH Wertes. Die Änderung des pH Wertes variiert als eine Funktion des Harnstoffgehaltes der Probe und wird unter Verwendung eines Differenzial-pH-Messgerätes gemessen.*Inhaltsverzeichnis
Published Code | DIN |
---|---|
Published By | Deutsches Institut für Normung |
Publication Date | 2007-03 |
Pages Count | 16 |
Language | Germany |
Descriptors | Agrarprodukt, Begriffe, chemische Analyse, Definition, Elektrode, enzymatisches Verfahren, Gehaltsbestimmung, Harnstoff, Laborgerät, Lebensmittel, Lebensmittelprüfung, Milch, pH-Wert, Probenahme, Referenzverfahren |
File Size | 215.0 KB |
ICS Codes | 67.100.01 - Milk and milk products in general |
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