A novel nanoadsorbent Ni/NixB for preconcentration of arsenic(III) and arsenic(V) before hydride generation-atomic absorption spectrometric determination

AbstractA novel adsorbent named Ni/NixB nanoparticles was synthesized for the preconcentration of both As(III) and As(V) from water samples. Both adsorbent preparation and adsorption procedure were optimized. The adsorption efficiencies for both As(III) and As(V) were higher than 99% when the initial pHs ranged from 4.0 to 10.0. The rate of the adsorption was high, and in the first 10 min, the adsorption efficiency reached 95%. Adsorbed As(III) and As(V) were recovered with high efficiencies from the adsorbent using 2 mol L−1 HCl. Under the optimal conditions, an enrichment factor of 50 was reached. Hundred-fold excess of Cd2+, Cu2+, Mg2+, Zn2+, K+, , , and ions did not affect the adsorption efficiencies of As(III) and As(V). The adsorption for both As(III) and As(V) obeyed the Freundlich and Langmuir isotherms. The maximum adsorption capacities calculated from the Langmuir isotherm were 2,500 mg g−1 for both species, and the adsorptions were favorable. The validation and the real sample application studi...