The Institute of Gas Technology samples high-pressure fuel gas from its RENUGAS(R) gasifiers by withdrawing the sample isokinetically at process conditions, removing particulates in a hot filter, and cooling the gas stream to condense unreacted steam and oils, which are then collected in a series of cooled traps at system pressure. Gas flow rate is controlled and measured to quantify the oil content in the bulk fuel gas, and fuel gas composition is continuously measured with an on-line GC. The sampling system Vessels are later rinsed with dichloromethane to obtain quantitative oil samples. Analyses of oils are performed off-line using capillary GC-FID and GC-MS. Using this methodology, IGT has obtained extensive data from a 10-tonne/day PDU in Chicago and a 90-tonne/day demonstration plant in Hawaii. The distribution of four oil fractions as a function of feedstock type, gasifier temperature, gasifier pressure, and steam:feed ratio were determined for wood chips, whole tree chips, and bagasse.