Note: the digestion time and volume of sulfuric acid required depends on the material to
be digested. If the digest is still yellowish, cool the digest and add an additional 5-10 mL sulfuric aci Continue digestion until a clear green digest is obtained (around 40-60 min) and
then turn off the digestion unit and lift the digestion flask from the digestion unit and put in the fume hood to release the volatile acid.