PMID: 6438050Sep 1, 1984

Comparison of HgO and CuSO4 as digestion catalysts in manual Kjeldahl determination of crude protein in animal feeds: collaborative study

Journal - Association of Official Analytical Chemists
P F Kane

Abstract

The official AOAC manual Kjeldahl method for determining crude protein in animal feeds, 7.015, uses HgO as a catalyst in the digestion step. Because of environmental considerations, there is considerable interest in alternative catalysts. A collaborative study compares the official HgO-catalyzed method and an alternative using CuSO4. Fifty-four samples consisting of blind duplicates of closely matched pairs, representing a range of animal feed materials and 2 standard materials, were analyzed once by each method. Results were returned by 22 laboratories. Means and standard deviations between methods were comparable. The CuSO4-catalyzed method has been adopted official first action.

Related Concepts

Mercuric oxide, (203)mercury-labeled
Animal Feed (Substance)
Catalysis
Copper
Dietary Proteins
Lysine Hydrochloride
Mercury
Oxides
Mercury Compounds, Inorganic
Copper Sulfate

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