Radiochemical separation for the certification of some trace elements in biological reference materials by neutron activation analysis

A radiochemical separation procedure based on chromatographic separation using Chelex-100 in 0.1M HAc-0.1M NH₄Ac at pH 4.8 and TDO in 6M HCl, has been developed to determine Cd, Co, Cr, Fe, Se, The, U, W and Zn in three biological materials of botanic origin used as SRM's: 1547 Peach Leaves, 1515 Apple Leaves and the new proposed material Spinach. The aim was to obtain more information for these elements whose values are not yet determined or are given only as suggested values.