title: The use of silica gel in source testing.
mesh_terms: D000327:Adsorption; D000397:Air Pollution / Q000517:prevention & control*; D002849:Chromatography, Gas; D004121:Dimethyl Sulfoxide / Q000494:pharmacology*; D005782:Gels; D006838:Hydrocarbons / Q000032:analysis; D006846:Hydrocarbons, Halogenated / Q000032:analysis; D007659:Ketones / Q000032:analysis; D012822:Silicon Dioxide; D012997:Solvents / Q000032:analysis*
chemical_list: D005782:Gels; D006838:Hydrocarbons; D006846:Hydrocarbons, Halogenated; D007659:Ketones; D012997:Solvents; D012822:Silicon Dioxide; D004121:Dimethyl Sulfoxide