_1664432719 1664432719 Hamid Shirkhanloo sahar.zi67@gmail.com Hamid Shirkhanloo Analytical Methods in Environmental Chemistry Journal AMECJournal 2645-5382 2645-5552 09 30 2022 5 03 10.24200/amecj.v5.i03 http://journal.amecj.com/index.php/AMECJ-01/issue/view/23 Mohammad Abbaszadeh Ali Miri Mohammad Reza Rezaei Kahkha In this study, the amino-functionalized metal-organic framework (NH2-MOFs) was used as an adsorbent for the extraction of cadmium in rice samples based on the pipette tip solid phase extraction (PT-SPE) before determined by the flame absorption spectrometry (F-AAS). The pH of the sample solution, initial concentration of the cadmium, the volume of the sample, elution ‎conditions, and the amount of adsorbent on the recovery of the cadmium were investigated and ‎optimized. The results showed that the best extraction efficiency of cadmium was obtained at pH 5.0, 2500.0 µL of cadmium solution, and 20.0 ‎µL of HCl (10% V/V) ‎ as eluent solvent. First, the cooking rice was transferred to a beaker and hydrochloric acid/nitric acid was added to it as a digestion process before analysis by the PT-SPE procedure. The limit of detection of this method was found to be 0.03 µg L-1 with a relative standard deviation of ≤ 2.5 % (for seven replicate analyses of 50 µg L-1 of cadmium). The linear and dynamic ranges were achieved at 0.3 -14.5 µg L-1 and 0.3 -150 µg L-1, respectively.  The adsorption capacity of sorbent and enrichment factor was 175 mg g-1 and 125 folds, respectively. 09 29 2022 70 79 http://creativecommons.org/licenses/by/4.0 10.24200/amecj.v5.i03.208 http://journal.amecj.com/index.php/AMECJ-01/article/view/208 http://journal.amecj.com/index.php/AMECJ-01/article/download/208/431 http://journal.amecj.com/index.php/AMECJ-01/article/download/208/431