Determination of sodium concentration by Na-23 NMR using an Anasazi conversion of a Varian A-60 NMR

CHED 292

Tonya M. Smith and Norman V. Duffy, nduffy@wju.edu. Department of Chemistry, Wheeling Jesuit University, 316 Washington Ave., Wheeling, WV 26003
A reliable method has been developed to measure the sodium concentration in a variety of samples (soy sauce, pickle brine and broth) using an Anasazi conversion of a Varian A-60 NMR. A series of standards (NaCl(aq)) were prepared and a linear plot of signal/noise ratio vs. concentration was observed. A fresh calibration is necessary each day. Determinations of sodium content were in good agreement with concentrations listed under “Nutritional Facts” for each sample.