the procedure for thyroxine and liothyronine involves hydrolysis of the sample with barium hydroxide and isolation and separation of the iodoamino acids using ion exchangers , followed by differential pulse polarographic determination in a supporting electrolyte composed of 0.5 n na2co3 in 20 % 2-propanol containing 1 % tetrabutylammonium bromide .
C0022023
ion
C0013832
electrolyte