Dispersive solid phase extraction with imidazole ionic liquid modified mesoporous silica SBA15 for selective separation and determination of inorganic arsenic in rice

Authors: CHEN, TUANWEI - Fujian Agricultural & Forestry University; ZHEN, WENBO - Fujian Agricultural & Forestry University; KANG, BINBIN - Fujian Agricultural & Forestry University; YAN, ZHIMING - Fujian Agricultural & Forestry University; LUO, JIE - Fujian Agricultural & Forestry University; DING, LIJIE - Fujian Agricultural & Forestry University; Chen, Guoying

Submitted to: Journal of Agricultural and Food Chemistry
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 11/6/2018
Publication Date: 12/8/2018
Citation: Chen, T., Zhen, W., Kang, B., Yan, Z., Luo, J., Ding, L., Chen, G. 2018. Dispersive solid phase extraction with imidazole ionic liquid modified mesoporous silica SBA15 for selective separation and determination of inorganic arsenic in rice. Journal of Agricultural and Food Chemistry. 37(12): 2024-2035. https://doi.org/10.14102/j.cnki.0254-5861.2011-2201.
DOI: https://doi.org/10.14102/j.cnki.0254-5861.2011-2201

Interpretive Summary: Carcinogenic inorganic arsenic (iAs) is a serious health concern for rice consumers, making its quantification a global priority. In this work, a novel ionic liquid modified mesoporous silica was synthesized to selectively adsorb iAs from rice matrix. Several techniques were applied to characterize the sorbent, and key analytical parameters were optimized. The resulting method achieved 8.8 parts per billion limit of detection, <2.0% relative standard deviation, and 92.3-94.4% recovery, hence was effective for iAs analysis.

Technical Abstract: A novel 1-methylimidazole ionic liquid modified SBA15 mesoporous silica (1-MIIL@SBA15) was synthesized and applied for selective separation of inorganic arsenic (iAs) from rice by dispersive solid phase extraction (DSPE), followed by hydride generation-atomic fluorescence spectrometric quantification. The as-prepared 1-MIIL@SBA15 was characterized using FESEM, FTIR, XRD and Zeta potential. Key parameters of adsorption and desorption in DSPE were intensively optimized using standard reference materials SRM 1568b rice flour. Under optimal conditions, the limit of detection was 8.8 ng/kg and relative standard deviation was =2.0%; recovery was in the 92.3%~94.4% range. This method was successfully applied to iAs determination in rice samples. Under acidic condition the electrostatic interaction between the positively charged sorbent and anionic iAs played an important role rendering this method suitable for iAs analysis.