Determination of cadmium in rice samples using amino-functionalized metal-organic framework by a pipette tip solid phase extraction

In this study, the amino-functionalized metal-organic framework (NH2-MOFs) was used as an adsorbent for extraction of cadmium in rice samples based on pipette tip solid phase (PT-SPE) before determined by flame absorption spectrometry (F-AAS). The pH sample solution, initial concentration cadmium, volume sample, elution ‎conditions, and amount recovery were investigated ‎optimized. results showed that best efficiency obtained at 5.0, 2500.0 µL 20.0 ‎µL HCl (10% V/V) ‎ eluent solvent. First, cooking transferred to a beaker hydrochloric acid/nitric acid added it digestion process analysis PT-SPE procedure. limit detection method found be 0.03 µg L-1 with relative standard deviation ≤ 2.5 % (for seven replicate analyses 50 cadmium). linear dynamic ranges achieved 0.3 -14.5 -150 L-1, respectively. adsorption capacity sorbent enrichment factor 175 mg g-1 125 folds,