Continuous-recording flame photometry of sodium and potassium in serum.

Serum sodium and potassium analyses by continuous-flow flame photometry is a well-accepted procedure (1, 2). Recently Habig and Williamson (3) have used the widely available Instrumentation Laboratory Model 143 (IL-143) flame photometer for continuousflow analyses. Pennacchia et al. (4) have operated this flame photometer at rates as high as 120 samples per hour. In both systems the results appear as numbers, on odometers. We have adapted the AutoAnalyzer Sampler II, Pump II, and a miniature manifold to the IL-143 flame photometer, and have designed a recorder interface to provide strip-chart recordings of the peaks.