Sodium ISE method Foods Ellis 2016 Summary v5 Orion

This article details a method for analyzing sodium in food using an Ion Selective Electrode (ISE). Sodium is extracted with boiling water, cooled, and measured in a 100 mL flask. Calibration standards are prepared, and the ISE meter is calibrated. Sodium concentration in samples is measured using the meter. Validation with NIST standards showed high precision and accuracy, with sodium recoveries of 92.0% to 100% and RSDs of 3.13% to 3.81%, ensuring reliable sodium measurement in food samples.