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Journal of Dairy Science Vol. 56 No. 12 1479-1485
© 1973 by American Dairy Science Association ®
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Cadmium Analysis of Dried Milk by Pulse Polarographic Techniques

D. G. Cornell and M. J. Pallansch

Dairy Products Laboratory, Agricultural Research Service, U.S. Department of Agriculture, Washington, D.C. 20250

ABSTRACT

The applicability of differential pulse anodic stripping voltammetry for the determination of little cadmium in milk has been demonstrated. Sample preparation included dry ashing and dissolving the ash in hydrochloric acid. Highest recovery of cadmium was with ashing temperatures between 500 and 540 C. Cadmium recovery was 94% on milk powder spiked at 10 parts per billion (ppb) and 86% on powder spiked at 2 ppb. Samples of foam spray-dried skim milk and freeze-dried whole milk contained less than 3 ppb cadmium on a dry weight basis.






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