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Automated infrared ashing with palladium nitrate as an ashing aid for the determination of selenium in plant foods by inductively coupled plasma mass spectrometry

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Abstract

Based on the automatic light wave ashing instrument, palladium nitrate was used as an ashing aid for the first time to collect selenium in the process of food ashing pre-treatment, and a method for the determination of selenium in food by ashing method was established with inductively coupled plasma mass spectrometry. At the same time, the effects of magnesium nitrate, rhodium nitrate, and nickel nitrate as ashing aids on selenium collection were investigated using certified plant standard materials. The capture of selenium by magnesium nitrate, rhodium nitrate, and nickel nitrate as ashing aids did not exceed 50%. Using palladium nitrate as an ashing aid, six food standard materials were measured, with selenium recovery rates ranging from 97 to 106%. A complete analysis cycle can be completed within an hour. The method detection limit of selenium was 0.021 μg g−1, and the relative standard deviation of five measurements was less than 7%. The experimental results show that palladium nitrate is an excellent ashing aid for capturing selenium, and it is far superior to the other three aids. In addition, the mechanism of palladium nitrate as an ashing aid for capturing selenium was discussed.

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Acknowledgements

This work was supported by the National Instrumentation Program of China (Grant No 2013YQ510391); the Shaanxi Province Science and Technology Project (Grant No 2015GY054, No 2021GY169 and 2024GX-YBXM-437).

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  1. Xi’an Northwest Geological Research Institute for Nonferrous Metals Co., Ltd., 25 Xiying Road, Xi’an, 710054, China

    Ni Zhang, Tuankun Zhou, Man Ye, Xiaoming Yang, Zhiying Ding & Hang Gao

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Zhang, N., Zhou, T., Ye, M. et al. Automated infrared ashing with palladium nitrate as an ashing aid for the determination of selenium in plant foods by inductively coupled plasma mass spectrometry. ANAL. SCI. (2024). https://doi.org/10.1007/s44211-024-00570-2

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