AI Article Synopsis
- The study compared concentrations of sodium, potassium, and chloride in control sera using various measurement methods against reference values.
- Measurements for sodium by flame photometry and ion selective electrodes were highly accurate, differing less than 1% from reference values, but photometry showed a -4.7% difference.
- For potassium and chloride, flame photometry and ion selective electrodes showed minimal bias, while other methods like nephelometry and some specific photometric techniques displayed greater discrepancies, with proposals for acceptable deviations discussed.
Article Abstract
The concentrations of sodium, potassium, and chloride in various control sera were determined by reference methods. The reference method values were compared with the corresponding method-dependent assigned values. Sodium: Measurements by flame photometry and ion selective electrodes differed on the whole by less than 1% from the reference method value; determinations by photometry differed, however, by -4.7%. Potassium: The mean bias was -1.2% with flame photometry and -0.4% with ion selective electrodes, whereas nephelometric procedures differed by -1.9 or -4.8%. Chloride: Satisfactory agreement was obtained with values given for ion selective electrodes (-0.3%), for some coulometric procedures (-0.7 and 0.4%), and photometric determinations using mercury rhodanide (-0.5 and +0.7%). Values for mercurimetric titration and for photometric determinations using mercury 2,4,6-tri-(2-pyridyl)-s-triazine differed by + 2.5 and + 1.8%. Proposals concerning the allowable deviation from reference method values are discussed.
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| http://dx.doi.org/10.1515/cclm.1985.23.12.865 | DOI Listing |
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