GB/T 13885-1992 Method for the determination of the iron、copper、manganese、zinc and magnesium in feedstuffs—Atomic absorption spectroscopy (English Version)
2017GB/T 13885-2017 Determination of the contents of calcium, copper, iron, magnesium, manganese, potassium, sodium and zinc in feeds—Method using atomic absorption spectrometry
2003GB/T 13885-2003 Animal feeding stuffs-Determination of thecontents of calcium,copper,iron,magnesium,manganese,potassium,sodium and zinc-Method using atomic absorption spectrometry
1992GB/T 13885-1992 Method for the determination of the iron、copper、manganese、zinc and magnesium in feedstuffs—Atomic absorption spectroscopy