Transcription of 9.1.09 AOAC Official Method 999.11 Determination of Lead ...
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9.1.09 AOAC Official Method 999.11 Determination of Lead ...
Official Method of Lead, Cadmium,Copper, Iron, and Zincin FoodsAtomic absorption Spectrophotometryafter Dry AshingFirst Action 1999 NMLK aoac Method [Applicable to the Determination of lead, cadmium, zinc, copper,and iron in food by dry ashing and flame atomic absorption spec-trometry (GFAAS), flame and graphite furnace the results of the interlaboratory study supportingthe acceptance of the Method .]Caution: Always gently add acid to environmental contamination by Pb. Store quartz cruciblesin 20% HNO3and rinse with deionized water before use. When neces-sary, crucibles may be boiled with 20%HNO3before use. Heat plati-num crucibles until red hot and boil with 50% (v/v) HCl prior to products with a high fat content ( 40%), , margarine orlard, with great care to avoid self-ignition. Pre-ash such products ac-cording toD(c)(2), even if a programmable furnace is PrincipleTest portions are dried and then ashed at 450 C under a gradual in-crease ( 50 C/h) in temperature.
9.1.09 AOAC Official Method 999.11 Determination of Lead, Cadmium, Copper, Iron, and Zinc in Foods Atomic Absorption Spectrophotometry after Dry Ashing
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