Recycle Analysis of Impurity in Resin

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.
H-2001 is an old type of K-2001.

Sample : Butylated hydroxytoluene, BTH

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

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