Although sodium and potassium have been the most commonly assayed analytes by clinical
chemists for many years there have been fewer analytical principles used routinely than for …

American Hospital Supply (UK) Ltd., Didcot, Oxon. An instrument supplied for a trial period in
our laboratory produced results for plasma and serum so-dium that differed significantly from …

The CVs of the enzymatic methods are considerably higher (CV 1.2%; 0.7-1.5%; C” T 1.3-
2.0%), and the CV values are affected by both CV and CIT0 contributions. In addition, the …

1. An apparatus is described for the flame-photometric determination of alkali elements. With
the exception of the burner, it is constructed from already existing standard accessories. The …

The relationship between direct-potentiometric and flame-photometric measurements of
sodium has been studied in human sera and other, simpler systems. When water content …

A method for the determination of serum sodium and potassium involving only a single
serum dilution is described. Samples of 0.1 ml. of serum suffice for both determinations, but …

A detailed description is given of a low-cost integrating flame photometer for simultaneous
analysis of sodium and potassium. The construction is simple and high sensitivity is …

We compared different sample-handling techniques for measurement of Na+ and K+ with
ion-selective electrodes (ISE). Imprecision was less for venous blood (with a minimum of …

Flame photometry offers an exceptionally rapid method for the determination of sodium and
potassium in blood, urine, exudates, and tissues ifthe requisite accuracy can be obtained …

In recent years the determination of sodium and potassium in biologic fluids has been
considerably simplified by the development of direct-reading flame photometers. The use of …