Zn-doped MoO3 nanorods for dispersive solid phase extraction of trace Pb(II) from water and food samples

Abstract

A rapid, and environmentally friendly dispersive solid phase extraction method based on Zn-doped MoO3 nanorods for efficient extraction of trace level of Pb(II) from water and food samples was established before high-resolution continuum source flame atomic absorption spectrometric detection. The sorbent characterization studies were carried out using BET, FE-SEM, XRD, and FT-IR techniques. To achieve effective phase separation and accurate analytical data, the adsorption and desorption procedures have been precisely adjusted. The presented approach demonstrated a wide working range (9.3–500 µg L−1), a relatively low detection limit (3.1 µg L−1), and very good extraction recoveries (90–104%) under optimum conditions. The matrix effect was investigated by the addition of interference ions. The presence of many different anions and cations in the environment did not lead to negative results and selectivity towards the analyte was observed. The method was validated by the analysis of certified reference materials (TMDA - 64.3 and INCT-OBTL-5). The enhancement factor has been determined as 10.9. The suggested method worked efficiently to extract and determine Pb(II) from water, tea, and oil samples.