This standard specifies the atomic absorption spectrometry method for the determination of zinc. This standard applies to the determination of 0.01% to 0.5% zinc content in compound fertilizers.
GB/T 14540.4-1993 history
2003GB/T 14540-2003 Determination of copper,iron,manganese,zinc,boron and molybdenum content for compound fertilizers
1993GB/T 14540.4-1993 Determination method of zinc in compound fertilizer
GB/T 14540.4-1993 Determination method of zinc in compound fertilizer was changed to GB/T 14540-2003 Determination of copper,iron,manganese,zinc,boron and molybdenum content for compound fertilizers.