Sodium and Potassium in Foods and Waters. Determination by the Flame Photometer

NUTRIENTS IN FROZEN FOODS: Vitamin, Mineral, and Proximate Composition of Frozen Fruits, Juices, and Vegetables

“…Vitamin Bs was determined by Calcium was determined by a ti trimetric method (70) after dry ashing of the samples. Sodium and potassium were determined by flame photometry (6) after the samples had been dry-ashed in the presence of magnesium nitrate, A colorimetric method based on that of Harvey, Komarmy, and Wyatt (8) was employed for determination of magnesium. Colorimetric methods were used for phosphorus (7) and total iron (79).…”

Food

“…The widespread use oí low-sodium diets in the treatment of cardiovascular disease has prompted the determination of the sodium and potassium content in some 500 foods and 150 public water supplies (11). The flame photometer was utilized in this survey.…”

Water Analysis

“…The use of suitable interference filters and acetylene or illuminating gas was described by Riehm (78). The amounts of sodium and potassium present in 150 public water supplies were determined with the flame photometer by Bills et al (14).…”