ABSTRACT
International, 481 North Frederick Ave., suite 500, Gaithersburg, MD 20877-2504, or may be examined at the Office of the Federal Register, 800 North Capitol Street, NW., suite 700, Washington, DC. With a suitable aliquot determine riboflavin by the method prescribed in section 43.041(a) by the ``Fluorometric Method-Official Final Action,’’ AOAC, 13th Ed. (1980), beginning with the third sentence of the second paragraph, ``Adjust, with vigorous agitation * * *.’’ Determine niacin in a 200-milliliter aliquot of the filtrate by the ``Colorimetric Method-Official Final Action,’’ in section 43.045, AOAC, 13th Ed. (1980), beginning with the sixth sentence of the first paragraph, ``Adjust to pH 4.5 with * * *.’’ Evaporate to dryness a 100-milliliter aliquot of the nonfiltered material withdrawn while agitating, and determine iron using the method ``Iron-Official Final Action,’’ in sections 14.011, 14.012, and 14.013, AOAC, 13th Ed. (1980), and, if required, determine calcium as directed in section 14.014 under the heading ``Calcium-Official Final Action,’’ AOAC, 13th Ed. (1980).
