{HEAD ~ A method} in accordance 1, wherein {TAIL ~ the ion exchange column} is a cation exchange column 
wherein
{ HEAD ~ A method } in accordance 1 , wherein { TAIL ~ the ion exchange column } is a cation exchange column
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH