Synthesis of a Novel Imidazole Ionic Liquid Modified Mesoporous Silica SBA15 for Selective Separation and Determination of Inorganic Arsenic in Rice

摘要

A novel 1-methylimidazole ionic liquid modified SBA15 mesoporous silica (1-MIIL@SBA15) was synthesized and applied to selective separation of inorganic arsenic (iAs) in rice by dispersive solid phase extraction (DSPE),followed by hydride generation-atomic fluorescence spectrometric (HG-AFS) quantification.The prepared sorbent was characterized by FTIR,FESEM,BET and Zeta potential.Key parameters of adsorption and desorption in DSPE were optimized using standard reference material 1568b rice flour.Under optimal conditions,the limit of detection was 8.776 ng/kg,relative standard deviation was ≤2.0％,and recoveries of iAs were in the 92.3～94.4％ range.This method was successfully applied to the determination of iAs in rice.Under acidic condition,the electrostatic interaction between the positively charged 1-MIIL@SBA 15 and anionic iAs played an important role in selective iAs separation,rendering this method suitable for iAs analysis.