HPLC-GC transfer occurred by the retention gap technique and
partially concurrent eluent evaporation (25), initially through the oncolumn
and later through the Y-interface (32). A 10 m 0.53 mm i.d.
uncoated, deactivated precolumn was followed by a steel T-piece union
connecting to the solvent vapor exit and a 15m 0.25 mm i.d. separation
column coated in the laboratory with a 0.13 μm film of PS-255.