Li Yatai,Guo Wei,Method Development for Direct Multielement Quantification by LA-ICP-MS in Food Samples

Title: Method Development for Direct Multielement Quantification by LA-ICP-MS in Food Samples

Author(s): Li, YT (Li, Yatai); Guo, W (Guo, Wei); Hu, ZC (Hu, Zhaochu); Jin, LL (Jin, Lanlan); Hui, SH (Hui, Shenghong); Guo, QH (Guo, Qinghai)

Addresses: Li, Yatai,China Univ Geosci, Fac Earth Sci, State Key Lab Biogeol & Environm Geol, Wuhan 430074, Hubei, Peoples R China; Guo, W (reprint author),China Univ Geosci, Fac Earth Sci, State Key Lab Biogeol & Environm Geol, Wuhan 430074, Hubei, Peoples R China.

Source: JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY  Volume: 67  Issue: 3  Pages: 935-942

DOI: 10.1021/acs.jafc.8b05479

Published: JAN 23 2019  

Abstract: A novel calibration strategy for the accurate determination of essential and toxic elements in both plant-based and animal-based foods was developed by synthesizing spiked agarose gels as matrix-matched external standards and carbon as the internal standard (IS). Aqueous solutions of agarose (4%, m/v) with defined amounts of the analytes were cast on a mold and then dried to form the agarose-gel standards. The spatial distributions of the analytes in the gel were examined using surface- and depth-mapping laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) protocols, and the gel homogeneity was found to be excellent (i.e., relative standard derivation <10%). Recovery of the 19 spiked elements in the gel standards was in the range of 86.9-94.7%. The limits of detection (LODs) ranged from 0.0005 (Rb) to 33.7 mu g g(-1) (S). Analysis results were in good agreement with certified values for various certified reference materials (CRMs). Furthermore, a porous rubber sample supporter was developed to improve the analysis throughput by about 3-fold.

Full Text from Publisher: https://pubs.acs.org.ccindex.cn/doi/10.1021/acs.jafc.8b05479