Ashing Procedure(Note: For liquid formulas, shake container before weighing.) Place test portion in previously cleaned Vycor evaporating dish, which may contain 5 g filter pulp for ease of handling. Exact amount of composite required will depend on concentration of minerals present. (For powders, take ≥1.5 g.) In general, 25 mL will be adequate. If some minerals, in particular Fe, Cu, or Mn, are at very low levels, a larger aliquot (≤50 mL) may be necessary.
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