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Determination of Major Cations in Milk by Atomic Absorption Spectrophotometry

1967; Elsevier BV; Volume: 50; Issue: 3 Linguagem: Inglês

10.3168/jds.s0022-0302(67)87416-2

1529-9066

G.K. Murthy, U.S. Rhea,

Meat and Animal Product Quality

Milk samples analyzed for major cations by atomic absorption spectrophotometry showed standard deviations for various elements, as follows: calcium, 0.019 g/liter, or 1.6%; magnesium, 0.002 g/liter, or 1.6%; potassium 0.029 g/liter, or 1.9%; and sodium, 0.010 g/liter, or 2.4%.Recoveries of added calcium, magnesium, potassium, and sodium in milk were quantitative, and reproducibility of analytical results was satisfactory.Comparison of results obtained with this method and those obtained by flame photometry, direct titration of milk with EDTA, and oxalatepermanganate titration indieated that calcium was significantly higher at a = 0.05.Anaysis of data by separation means, however, revealed that the calcium content in whole nfilk did not vary significantly between methods, whereas for skimmilk, two of the four samples showed higher results with atomic absorption spectrophotometry.Measured values were within the required accuracy.Determination of magnesium by this method was particularly satisfaetow, and results were more reliable than those obtained by direct titration of nfilk; results for potassium and sodium were comparable to those obtained by flame photometry.