Preconcentration via ion associated complexes combined with inductively coupled plasma optical emission spectrometry for determination of heavy metals

► Precipitates of ionic associations were applied to preconcentration of metal. ► Analytes were co-precipitated with ionic associate La-2,2-bipyridyl-rose Bengals. ► The method can be applied to multielement analysis of plant materials. ► Using ICP-OES and F-AAS techniques.