Zirconium-based highly porous metal-organic framework (MOF-545) as an efficient adsorbent for vortex assisted-solid phase extraction of lead from cereal, beverage and water samples

- Zirconium based metal organic framework, MOF-545, was synthesized and characterized.
- The surface area of MOF-545 was found to be 2192 m2/g.
- Zeta potential is positive at low pH (pH < 3) and negative at high pH (pH ≥ 3).
- Contact times for both adsorption and elution was optimized as 15 min.
- Vortex assisted-solid phase extraction of lead from cereal, beverage and waters.

In this study, zirconium-based highly porous metal-organic framework, MOF-545, was synthesized and characterized. The surface area of MOF-545 was found to be 2192 m2/g. This adsorbent was used for the first time as an adsorbent for the vortex assisted-solid phase extraction of Pb(II) from cereal, beverage and water samples. Lead in solutions was determined by FAAS. The optimal experimental conditions were as follows: the amount of MOF-545, 10 mg; pH of sample, 7; adsorption and elution time, 15 min; and elution solvent, 2 mL of 1 mol L−1 HCl. Under the optimal conditions of the method, the limit of detection, preconcentration factor and precision as RSD% were found to be 1.78 μg L−1, 125 and 2.6%, respectively. The adsorption capacity of the adsorbent for lead was found to be 73 mg g−1. The method was successfully verified by analyzing two certified reference materials (BCR-482 Lichen and SPS-WW1 Batch 114) and spiked chickpea, bean, wheat, lentil, cherry juice, mineral water, well water and wastewater samples.