Bis-pyrazolyl functionalized mesoporous SBA-15 for the extraction of Cr(III) and detection of Cr(VI) in artificial jewelry samples

A new method coupling novel solid-phase extraction (SPE) with inductively coupled plasma-atomic emission spectrometry (ICP-AES) was developed, based on the adsorbent prepared by modifying a strong-coordinating bis-pyrazolyl functional monomer onto mesoporous silica SBA-15. The adsorbent DPP@SBA-15 was characterized by a set of analytical techniques, as well as studied the optimized various experimental parameters such as pH, stripping agent, adsorption capacity and equilibrium adsorption time. This newly developed adsorbent material do exhibit good chemical and mechanical stability, satisfactory adsorption capacity (72.5 mg/g) and high selectivity for Cr(III). Consequently, the DPP@SBA-15 was utilized as SPE adsorbent for adsorption of Cr(III) and determination of Cr(VI). An excellent linearity was shown in the range of 1-20 mu g/mL(-1) (R-2 = 0.9999), and the limit of determination 0.028 mu g/mL(-1). Furthermore, Cr(VI) released from artificial ring was successfully detected and considerable recoveries varying from 97.6 to 103.0% were attained. (C) 2016 Elsevier B.V. All rights reserved.