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  • Title: Interferent ion effects on the Orion SS-20 Calcium Ion Analyser.
    Author: Vadgama P, Mitchison J, Covington AK, Alberti KG.
    Journal: Clin Chim Acta; 1982 Mar 12; 119(3):249-56. PubMed ID: 7067123.
    Abstract:
    Selectivity studies were carried out on bis-dialkyl phosphate and neutral carrier sensors available with the Orion SS-20 Calcium Analyser. Neutral carrier sensors showed better selectivity; changes of H+, Na+, K+ and Mg2+ within the physiological range produced no significant error in Ca2+ measurement. The Nicolsky equation, used as the basis of these studies, did not fully account for electrode response to mixed electrolytes. The importance of a check on the selectivity of sensors is emphasised.
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