Chromium determination in food by slurry sampling graphite furnace atomic absorption spectrometry using classical and permanent modifiers

► Slurry sampling GFAAS for Cr determination in plant materials was proposed. ► It was proved that Ir/Nb is preferable permanent modifier for Cr determination. ► The amount of iridium and niobium as permanent modifiers was optimised. ► XRD studies conformed that NbC on graphite surface prevents of Cr3C2 formation. ► Application of Mg(NO3)2 for Cr determination by slurry sampling GFAAS is ineffective.