SULFURIC ACID/PERMANGANATE CLEANUP

2.1 An extract is solvent exchanged to hexane, then the hexane is sequentially treated with (1) concentrated sulfuric acid and, if necessary, (2) 5% aqueous potassium permanganate. Appropriate caution must be taken with these corrosive reagents. 2.2 Blanks and replicate analysis samples must be subjected to the same cleanup as the samples associated with them. 2.3 It is important that all the extracts be exchanged to hexane before initiating the following treatments.