The color of some impurity substance in a resin changed to yellow. And, the substance was fractionated by recycle analysis using GPC H-2001 and the chemical structure was determined.


Sample : Butylated hydroxytoluene, BTH

Columns      : Shodex GPC H-2001 (20.0 mm I.D. x 500 mm) x 2
Eluent       : CHCl3
Flow rate    : 3.0 mL/min
Detector     : UV (254 nm)
Column temp. : Room temp.

S. Nakamura et al, J. Chromatgr. , 83 (1973) 279