This standard specifies the gas chromatography-high-resolution mass spectrometry method for determining polybrominated biphenyls in soil and sediment. This standard applies to soil and sediment samples containing 2-1-bromobiphenyl, 3-1-bromobiphenyl, 2,5-dibromobiphenyl, 2,6-dibromobiphenyl, 4,4 '- dibromobiphenyl, 2,4,6-tribromobiphenyl, 2,2', 4,5 '- tetrabromobiphenyl, 2,2', 5,5 '- tetrabromobiphenyl, 3,3', 4,4 '- tetrabromobiphenyl, 2,2', 4,5,5 '- pentabromobiphenyl, 2,2', 4,4 ', 5,5' - hexabromobiphenyl, 2,2 ', 4,4', 5,6 '- hexabromobiphenyl, 2,3,3', 4,4 ', 5-hexabromobiphenyl, 3,3', 4,4 ', 5,5' - hexabromobiphenyl Determination of 20 polybrominated biphenyls, including 5 '- hexabromobiphenyl, 2,2', 3,4,4 ', 5,5' - heptabromobiphenyl, 2,2 ', 3,3', 4,4 ', 5,5' - octabromobiphenyl, 2,3,3 ', 4,4', 5,5 ', 5,5', 6-octabromobiphenyl, 2,2 ', 3,3', 4,4 ', 5,5', 6,6 '- decabromobiphenyl. When the sampling volume is 10.0 g and the fixed volume is 50 μ l, the detection limit of the method for determining one to ten brominated biphenyls in this standard is 0.01 μ g/kg to 0.1 μ g/kg, and the lower limit of determination is 0.04 μ g/kg to 0.4 μ g/kg.