Determination of Cd Ion in Environmental Water Sample by Sorption Extraction Stir Bar Based on Monolithic Material

KeyWord:stir bar  Cd ion  monolithic material  environmental water

Abstract:

      A novel sorption extraction stir bar£¨SBSE£© based on the polymer monolithic material was prepared by in situ stepwise polymerization of epoxy resin£¨EP£© and diethlenetriamine£¨DETA£© using polyethylene glycol£¨PEG 1540£© as porogen. The SBSE was used for the adsorption and extraction for Cd ion in environmental water sample. The experimental conditions such as pH value£¬stir rate£¬extraction time£¬desorption solution and time were optimized. The SBSE operation was performed at a stirring rate of 300 r/min at pH 6ª±0 for 30 min£¬and the desorption was done in 5% HNO3 for 10 min. The concentration of Cd ion was detected by ICP-AES method. The result indicated that the calibration curve showed a good linear relationship in the Cd concentration range of 0ª±1-50 mg/L with a correlation coefficient of 0ª±997 2.The relative standard deviation and detection limit(3¦Ò) were 4ª±6%and 3ª±8 ¦Ìg?L-1, respectively£¬ and the recoveries ranged from 97% to 104%. The method could be applied to the determination of Cd ion in environmental water samples with good reproducibility and reliability.