Elektrolyt-Analysatoren verschiedener Hersteller mit ionenselektiven Elektroden (ISE) wurden daraufhin überprüft, ob die Konzentrationen an Natrium, Kalium und Kalzium in wäßrigen Lösungen dann mit ausreichender Genauigkeit bestimmt werden, wenn ein- oder mehrwertige anorganische und organische Anionen in physiologischer Konzentration vorliegen. Die Meßergebnisse zeigen übereinstimmend für alle Geräte mit ISE, daß Anionen wie Acetat, Citrat, Malat, Lactat, Phosphat und Sulfat in physiologischen oder therapeutischen Konzentrationen zu erheblichen Fehlern bei der Konzentrationsbestimmung von Natrium und Kalzium führen können. Es wird empfohlen, den Einsatz von ISE in Medien wie Infusionslösungen, Blutderivaten, Dialyseflüssigkeiten und Urin neu zu überdenken.

Keywords:
Ionenselektive Elektroden (ISE), Natrium, Kalzium, Metabolisierbare Anionen, Acetat, Citrat, Malat, Lactat, Phosphat
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© 1992 S. Karger AG, Basel
1992
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