Concentration of hydrocarbons on silica gel prior to gas chromatograpic analysi.
D000397:Air Pollution; D006838:Hydrocarbons; D058428:Silica Gel; D012822:Silicon Dioxide
D006838:Hydrocarbons; D058428:Silica Gel; D012822:Silicon Dioxide
AIR POLLUTION; HYDROCARBONS; SILICA