GB/T 13081-2022 Active

This document describes the atomic fluorescence spectrometry, cold atomic absorption spectrometry, and direct injection methods for the determination of total mercury in feed. This document is applicable to the determination of total mercury in compound feed, concentrated feed, supplementary feed, additive premix feed, feed raw materials, and feed additives. Atomic fluorescence spectrometry: When the sample weighs 0.5 g and the volume of the dilution solution is 50 mL, the method's detection limit is 0.6 μg/kg, and the quantification limit is 3 μg/kg. Cold atomic absorption spectrometry: When the sample weighs 2 g and the volume of the dilution solution is 100 mL, the method's detection limit is 3 μg/kg, and the quantification limit is 10 μg/kg. Direct injection method: When the sample weighs 0.1 g, the method's detection limit is 0.3 μg/kg, and the quantification limit is 1 μg/kg.