Comments on AOAC dry ash method for digestion of mineral-mix feeds.
Phosphorus in feeds or mineral mixes containing monobasic calcium phosphate cannot be determined accurately if the sample is subjected to the dry ash procedure described in AOAC method 7.125-7.128. HCl-insoluble calcium metaphosphates are formed at the high temperature required for ashing.
Office of the Texas State Chemist, Agricultural Analytical Services, College Station 77841.
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Latimer
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Ilger
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Hinojosa
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Roth
D000821:Animal Feed / Q000032:analysis*; D002130:Calcium Phosphates / Q000032:analysis*; D007202:Indicators and Reagents; D008903:Minerals / Q000032:analysis*; D014961:X-Ray Diffraction
D002130:Calcium Phosphates; D007202:Indicators and Reagents; D008903:Minerals