Application of a Functionalized Magnetic Metal-Organic Framework Nanoadsorbent for Extraction/Determinationof Arsenic in Rice and Canned Tuna Samples Consumed in the Iranian Market

In this study, a magnetic metal-organic framework functionalized with 8-aminoquinoline was synthesized to monitor and measure arsenic in rice and tuna samples consumed in the Iranian market. After identifying the nanoadsorbent by FT-IR, SEM, TEM, VSM, XRD, CHN, DLS, Zeta potential and BET methods, parameters affecting adsorption and desorption were optimized. Optimization of the extraction process was performed by the experimental design method based on a three levels Box-Behnken design. Then the desired method was validated and finally, the synthesized adsorbent was used to monitor and measure arsenic in rice and tuna samples consumed in the Iranian market. The optimal extraction conditions were: pH of the sample solution, 3.6; adsorption time, 12 minutes; nanoadsorbent dose, 16 mg; type and concentration of elution solvent, 0.06 M nitric acid; elution time, 8.5 minutes; eluent volume, 0.8 ml. Under the optimal conditions, the detection limit of the method was equal to 0.01 μg/l, and the method exhibited good accuracy in the analysis of the sample with the confirmed concentration. Under the optimal conditions, the desired method was evaluated in order to monitor and measure arsenic in rice and tuna samples available in the Iranian market, and very good results were obtained.The most important advantages of the present method are its simplicity, easiness, time saving and high accuracy.