title: A simplified oxygen bomb combustion procedure for carbon-14 in agricultural materials and soils.
mesh_terms: D001464:Barium; D002247:Carbon Isotopes / Q000032:analysis*; D002254:Carbonates / Q000032:analysis; D002622:Chemistry, Agricultural; D006540:Herbicides; D008722:Methods; D010944:Plants / Q000032:analysis*; D012987:Soil / Q000032:analysis*; D014465:Ultrasonics
chemical_list: D002247:Carbon Isotopes; D002254:Carbonates; D006540:Herbicides; D012987:Soil; D001464:Barium