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Guest Editorial Comment

Guest Editorial Comment Guest Editorial Comment J. Clin. Chem. Clin. Biochem. Vol. 28, 1990, pp. 813-815 © 1990 Walter de Gruyter & Co. Berlin · New York Guest Editorial Comment Determination of Sodium with Ion-Selective Electrodes: A New Method or a New Quantity? It is generally accepted that active molality (raNa) is the most important quantity for evaluating and understanding the effect of sodium ions. Other quantities, which are more or less helpful for this purpose, are: Free molal concentration (wNa), which can be calculated from mNa: mNa = --^ [mmol/kg H2O] YNa yNa = molal activity coefficient of sodium Total molal concentration (wtNa), which includes free molal and complex bound molal concentration: = "%a + mNaHco3 + ^Naco3- + mNax + wNaprot [mmol/kg H2O] WNaHco3'· tf?Naco3-: tt*Nax' ^Naprot' sodium sodium sodium sodium bound bound bound bound to to to to HCO3~ CCV other anions proteins Total molar concentration of a serum (ctNa), which is given by: CtNa = WtNa ' Qn2o [mmol/1 serum] QH2(> mass concentration of water in the serum The above mentioned quantities can be determined more or less reliably as follows. 1. Active molality of sodium (mNa) can be determined directly by ion-selective electrodes without dilution of http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Clinical Chemistry and Laboratory Medicine de Gruyter

Guest Editorial Comment

Clinical Chemistry and Laboratory Medicine , Volume 28 (11) – Jan 1, 1990
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Publisher
de Gruyter
Copyright
Copyright © 2009 Walter de Gruyter
ISSN
1434-6621
eISSN
1437-4331
DOI
10.1515/cclm.1990.28.11.813
Publisher site
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Abstract

Guest Editorial Comment J. Clin. Chem. Clin. Biochem. Vol. 28, 1990, pp. 813-815 © 1990 Walter de Gruyter & Co. Berlin · New York Guest Editorial Comment Determination of Sodium with Ion-Selective Electrodes: A New Method or a New Quantity? It is generally accepted that active molality (raNa) is the most important quantity for evaluating and understanding the effect of sodium ions. Other quantities, which are more or less helpful for this purpose, are: Free molal concentration (wNa), which can be calculated from mNa: mNa = --^ [mmol/kg H2O] YNa yNa = molal activity coefficient of sodium Total molal concentration (wtNa), which includes free molal and complex bound molal concentration: = "%a + mNaHco3 + ^Naco3- + mNax + wNaprot [mmol/kg H2O] WNaHco3'· tf?Naco3-: tt*Nax' ^Naprot' sodium sodium sodium sodium bound bound bound bound to to to to HCO3~ CCV other anions proteins Total molar concentration of a serum (ctNa), which is given by: CtNa = WtNa ' Qn2o [mmol/1 serum] QH2(> mass concentration of water in the serum The above mentioned quantities can be determined more or less reliably as follows. 1. Active molality of sodium (mNa) can be determined directly by ion-selective electrodes without dilution of

Journal

Clinical Chemistry and Laboratory Medicine – de Gruyter

Published: Jan 1, 1990

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