The precision of determinations of zinc content of food.
Seven different types of foodstuff (containing 3-100 ppm Zn) were each analysed for zinc by colorimetry, polarography and atomic-absorption spectroscopy. All the techniques yielded similar values for the zinc content of a given sample, but atomic-absorption spectroscopy had a smaller average coefficient of variation.
Higgins
M L
ML
Australasian Food Research Laboratories, Cooranbong, N.S.W.2265, Australia.
Pickering
W F
WF