To achieve this chemistry , the F is separated from the aqueous solvent by trapping it on an ion - exchange column .
To achieve this chemistry , the F is eluted with an acetonitrile solution of 2 , 2 , 2 - cryptand and potassium carbonate .
To achieve this chemistry , the F is separated from the aqueous solvent by trapping it on an ion - exchange column , and eluted with an acetonitrile solution of 2 , 2 , 2 - cryptand and potassium carbonate .