The mineral composition of apples. II.—Analytical methods

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Abstract
Two methods of determination of potassium in apples using aqueous extraction and a flame photometer are described. Comparisons with results obtained by ashing show that 95–98% of the total potassium can be recovered. Methods of clarifying the extracts are compared.Methods used to determine potassium, sodium, calcium, magnesium and phosphorus in ash solutions are discussed. It is shown that the concentrations of the other ions present in ash solutions do not interfere with the direct determination of potassium and sodium by flame photometer.