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Journal of Dairy Science Vol. 71 No. 1 134-142
© 1988 by American Dairy Science Association ®
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Matrix Modifiers for Feedstuff Selenium Analysis by Graphite Furnace Atomic Absorption Spectroscopy1

T. F. Brown and L. K. Zeringue

Southeast Research Station, Louisiana Agricultural Experiment Station, Louisiana State University Agricultural Center, Franklinton 70438

ABSTRACT

Gallium, Co, Mn, Ni, Cd, Cu, and Zn, dissolved in methanol, were evaluated for efficacy as an alternate volume matrix modifier in Se analysis of forages and concentrates. Gallium, Co, Mn, and Zn were unsuitable as modifiers.

Nickel, Cd, Cu, and modifier "M" (Ni + Cd + Cu) were used to test recovery of Se addition (.025, .050, .100, .200, and .500 µg) in meat and bone meal, pelleted grain dust, dry milk replacer, whole soybeans, and alfalfa hay. Recovery of Se with Cu, Cd, and "M" had large and variable SD of means within Se concentrations across feedstuffs and within feedstuff across Se concentrations. Mean percent recoveries of Se with the Ni modifier for the five concentrations over all feedstuffs were 106.4, 102.4, 100.2, 97.5, and 97.4, respectively.

Repeated analyses of these same five feedstuffs, plus National Bureau of Standards citrus leaves and corn stalk (recommended Se = .016 µg/g), gave Se concentrations (means µg/g) of .423, .104, .168, .196, .624, .027, and .015, respectively. Results obtained with Cd, Cu, and "M" had larger SD than did results obtained with Ni. Nickel nitrate in methanol as an alternate volume matrix modifier for Se provided reliable and sensitive Se analyses for a variety of feedstuffs.

FOOTNOTES

1 Approved for publication by the Director of the Louisiana Agricultural Experiment Station as Manuscript Number 87-88-1251.






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Copyright © 1988 by the American Dairy Science Association ®.