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Citation: NI Zhang-Lin, YU Qing, QU Ming-Hua, TANG Fu-Bin. Determination of Nine Kinds of Trace Metal Elements in Olive Oil by Vortex-assisted Extraction Followed by Inductively Coupled Plasma-Optical Emission Spectrometer[J]. Chinese Journal of Analytical Chemistry, ;2020, 48(4): 530-535. doi: 10.19756/j.issn.0253-3820.191577 shu

Determination of Nine Kinds of Trace Metal Elements in Olive Oil by Vortex-assisted Extraction Followed by Inductively Coupled Plasma-Optical Emission Spectrometer

Research Institute of Subtropical Forestry, Chinese Academy of Forestry;Quality Testing Center for Non-wood Forest Products of National Foresty and Grassland Administration(Hangzhou), Hangzhou 311400, China

Received Date: 28 September 2019
Revised Date: 26 January 2020

A vortex-assisted liquid-liquid extraction protocol followed by inductively coupled plasma optical emission spectrometer (ICP-OES) was developed for determination of nine elements (Cr, Mn, Fe, Ni, Cu, As, Zn, Cd, and Pb) in olive oil samples. The experiment was performed under optimum conditions including 5% HNO₃ (V/V) and vortex-assisted extraction for 5 min. Dichloromethane was used to make the extraction solvent to the upper layer, which increased the ratio of oil-extraction solvent to 1∶1 (m/V). Quantification limits were 0.01-0.05 mg/kg, which was satisfied with the request of determination of legislated metals in olive oil samples. The accuracy of the method was assessed by spiking experiments and comparison of the results from the extraction procedure with those obtained by national standard method of China. The recoveries were 90.2%-103.6% with RSD less than 5%. No statistical differences, based on t-test at a confidence level of 95%, were detected between two methods. The proposed method was simple, fast and accurate in determination of olive oil samples.
- Olive oil,
- Metal element,
- Vortex-assisted extraction,
- Inductively coupled plasma-optical emission spectrometer
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