Sample preparation of powders for trace metal analysis

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oldskoolbarry
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When preparing a fine powder for trace metal analysis, is ashing prior to digesting unnecessary? If not, or not necessarily, where could I learn more about important considerations to determine whether of not any preparation prior to digestion is required?

The one instance I have come across thus far for milk powder says it is easily digested - which suggests to me that there is no prior preparation necessary.

Im specifically looking at low-fat organic matrices at this stage
 
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What does the relevant ASTM methods manual say about your question?
 
What analytical technique are yo using Flame AA, ICP, MS, XRF, PIXE, SEM?