PubMed · 17989
[An ion exchange method to determine free metal concentrations, adapted for use in biological fluids: methods and determination of (Mg2+)].
Abstract
An ion exchange method for measuring concentrations of free (ionized) metal ions and its application to the determination of [Mg2+] is described. A surface sulfonated polystyrene material is used as the "twodimensional" cation exchanger. The sample-volume is 1 ml. About 50 determinations can be performed within 1 hr having a standard error of +/- (2-4)% in the optimal range of measurement. Advantages and disadvantages of the method compared with other ones are demonstrated and discussed. Free Mg2+ ion concentrations were measured in solutions containing pyrophosphate as well as haemoglobin and compared with those which were determined by equilibrium calculation or ultrafiltration.
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W Achilles, B Scheidt, H Hoppe, G A Cumme. 1977. [An ion exchange method to determine free metal concentrations, adapted for use in biological fluids: methods and determination of (Mg2+)].. https://pubmed.ncbi.nlm.nih.gov/17989/
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