1. Scope
This standard specifies determination of chromium content in feeds by atomic absorption spectrometer and spectrophotometer.
For the purpose of this standard, Method 1 (atomic absorption spectrometry method) is applicable to feed material (including leather meal for feeds and hydrolyzed leather meal), trace mineral premix, compound premix, concentrated feed and formula feed; thereinto, the minimum detection limit by graphite furnace atomic absorption spectrometry method is 0.005μg/kg, and that by flame atomic absorption spectrometry method is 150μg/kg. Method 2 (spectrophotometric method) in this standard is applicable to determination of chromium in feed material (including hydrolyzed leather meal) and formula feed.
2. Normative References
The following standards contain provisions which, through reference in this standard, constitute provisions of this standard. For dated reference, subsequent amendments to (excluding corrigenda), or revisions of, any of these publications do not apply. However, all parties coming to an agreement according to this standard are encouraged to study whether the latest edition of these documents is applicable. For undated references, the latest edition of the normative document applies.
GB/T 6682 Water for Laboratory Use; Specifications (neq ISO 3696)
GB/T14699.1 Animal Feeding Stuffs - Sampling
3. Method 1: Atomic Absorption Spectrometry Method
