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| Determination of heavy metal elements in edible vegetable oils by inductively coupled plasma optical emission spectrometry |
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| DOI： |
| KeyWord:edible vegetable oils heavy metal inductively coupled plasma optical emission spectrometry multimode sample introduction system fast automatic curve fitting technology |
| FundProject:国家自然科学基金项目（81603400）；长沙市杰出创新青年培养计划（kq1802017）；长沙市科技计划项目（kq1901067）；湖南省中医药研究院科研项目（201805）；重庆市自然科学基金项目（cstc2018jcyjAx0594） |
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| Abstract: |
| A rapid and accurate method for the determination of heavy metals in edible vegetable oils was investigated. Edible vegetable oils were pretreated with microwave digestion. In the dual mode of multimode sample introduction system (MSIS), the contents of vapor forming heavy metal elements As, Sb and Hg and non-vapor forming heavy metal elements Ni, Cd and Pb were determined by inductively coupled plasma optical emission spectrometry (ICP-OES). Hydrochloric acid was selected to acidify the sample and reduce the oxidized elements in the sample. L-cysteine/tartaric acid was added online to improve the vapor generation efficiency. Fast automatic curve fitting technology (FACT) was used to eliminate spectral interference. The method detection limit (LOD) was 0.63-20.60 μg/kg, the recovery rate was 97.0%-104%, and the relative standard deviation (RSD) was 1.5%-2.6%. The method does not need to switch between different sampling systems when analyzing vapor forming elements and non-vapor forming elements, which can meet the needs of high throughput analysis of trace heavy metal elements in edible vegetable oils. |
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