Evaluation of a new semiautomatic electrode system for simultaneous measurement of ionized calcium and pH
作者： F. Aas , J. Wandrup , O. Siggaard-Andersen , J. Thode
DOI: 10.1080/00365518209168106
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摘要: The instrument (ICA 1 Radiometer, Copenhagen) measures the activity of calcium ion and hydrogen displays estimated concentration free (cCa2+) pH at 37°C in 110 μl whole blood or serum. cCa2+ 7.40 is calculated by means a fixed relationship between pH. results are indicated on display approximately min after sample introduction. measuring cycle plus automatic rinsing takes 3 min. apparatus equipped with number control functions. sensitivity electrode showed fall from 100% to 92% over 20 weeks. cell potential slow drift -0.02 mV per day 20-week period while which employs same reference no drift. Interference Na+, K+, Li+, Mg2+ H+ measurement be most +0.1 %. effect erythrocytes static liquid junction minimized special extrapolation procedure. ...
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