Chelating agent free-solid phase extraction (CAF-SPE) of Co(II), Cu(II) and Cd(II) by new nano hybrid material (ZrO2/B2O3)

► A novel sorbent for solid phase extraction for the preconcentration of metal ions. ► Hybrid nano-scale ZrO2/B2O3 as a new SPE material. ► There is a no need for using any chelating agents before the preconcentration procedure.