GB/T 13080.2-2005 Feed additive—Determination of chelation percentage of iron、copper、manganese and zinc methionine—Gel filtration chromatography

GB/T 6682-1992 Water for analytical laboratory use—Specification and test methods GB/T 6682-2008 Water for analytical laboratory use—Specification and test methods GB/T 13885-1992 Method for the determination of the iron、copper、manganese、zinc and magnesium in feedstuffs—Atomic absorption spectroscopy GB/T 13885-2003 Animal feeding stuffs—Determination of thecontents of calcium,copper,iron,magnesium,manganese,potassium,sodium and zinc—Method using atomic absorption spectrometry GB/T 13885-2017 Determination of the contents of calcium,copper,iron,magnesium,manganese,potassium,sodium and zinc in feeds—Method using atomic absorption spectrometry GB/T 14699.1-1993 Methods for sampling of feed GB/T 14699.1-2005 Feeding stuffs—Sampling