Koch D D, Parrish D, Ladenson J H
Clin Chem. 1983 Jun;29(6):1090-2.
We evaluated an accessory that enables the Du Pont aca discrete analyzer to measure Na+ and K+ by direct potentiometry (aca/ISE). Na+ and K+ gave linear responses in both the blood and urine modes, with no carryover. No interfering species were identified in the blood mode. Intra-assay and interassay precision for Na+ and K+ were more than adequate and analytical recoveries comparable to those with flame photometry were found for plasma. The Na+ and K+ values for plasma were comparable with those obtained by use of another direct potentiometric analyzer (the Orion SS-30), but slightly higher than flame-photometric values. Samples from patients with hyperlipemia and multiple myeloma gave clinically relevant values with the aca/ISE, but the flame photometric values were artefactually low. Whole blood could not be accurately analyzed. The aca/ISE is a precise, easy-to-use instrument, which gives values for plasma similar to those obtained with direct potentiometric analyzers. For analysis of urine, certain precautions are necessary.
我们评估了一种附件，它能使杜邦aca离散分析仪通过直接电位分析法（aca/离子选择性电极法）测量钠离子（Na+）和钾离子（K+）。在血液和尿液模式下，Na+和K+均呈现线性响应，且无残留。在血液模式下未发现干扰物质。Na+和K+的批内和批间精密度均足够，且血浆的分析回收率与火焰光度法相当。血浆中的Na+和K+值与使用另一种直接电位分析仪（奥立龙SS-30）获得的值相当，但略高于火焰光度法的值。高脂血症和多发性骨髓瘤患者的样本使用aca/离子选择性电极法可得出临床相关值，但火焰光度法的值人为地偏低。全血无法准确分析。aca/离子选择性电极法是一种精确、易于使用的仪器，其血浆值与直接电位分析仪获得的值相似。对于尿液分析，需要采取某些预防措施。
