This standard specifies the determination method for mercury in compound feed, concentrated feed, premixed feed and feed additives. This standard applies to the determination of mercury in compound feed, concentrated feed, premixed feed and feed additives. Atomic fluorescence spectrometry: the detection limit is 0.15µg/kg, the best linear range of the standard curve is 0µg/L~60µg/L; the detection limit of cold atomic absorption: pressure digestion method is 0.4µg/kg, other digestion methods are 10µg /kg