Use of Cu(II) and Fe(III) N-benzoyl-N-phenylhydroxylamine coprecipitants for preconcentration of some trace metal ions in food samples

► Cu(II) and Fe(III) as carrier elements. ► N-benzoyl-N-phenylhydroxylamine (BPHA) as a chelating reagent. ► Fe(III), Cr(III) and Cr(VI) ions with Cu(II)-BPHA coprecipitant were preconcentrated. ► Cu(II), Pb(II), Cr(III) and Cr(VI) ions with Fe(III)-BPHA were recovered. ► The optimum parameters obtained for both coprecipitation methods show similarity.