Discussion
Why must acids used for digestion be of high purity?
Answer: A
At nanogram levels the metal content of an ordinary reagent acid can exceed the amount being determined, so the blank swamps the sample. Tube attack, flame temperature and nebuliser blockage are lesser concerns. That the reagents become the dominant source of analyte as detection limits fall is a general feature of trace analysis, and it is why sub-boiling distilled acids exist as a product.
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