Citation: CHEN Hai-Jie, MA Na, CHEN Wei-Ming, GU Xue, ZHANG Peng-Peng, ZHANG Ling-Huo, BAI Jin-Feng, YU Zhao-Shui. A Method for Suppressing Volatile Loss of Selenium in Digestion of Plant Samples[J]. Chinese Journal of Analytical Chemistry, ;2020, 48(9): 1268-1272. doi: 10.19756/j.issn.0253-3820.201174 shu

A Method for Suppressing Volatile Loss of Selenium in Digestion of Plant Samples

Key Laboratory of Geochemical Exploration, Ministry of Natural Resources, Institute of Geophysical and Geophysical and Geochemical Exploration, Chinese Academy of Geological Sciences, Langfang 065000, China

Received Date: 31 March 2020
Revised Date: 20 June 2020

Fund Project: This work was supported bythe R&D Program of the China Geological Survey (No. DD20190522), the Ministry of Science and Technology of China (No. 2016YFC0600601) and the National Nonprofit Institute Research Grant of IGGE(No.AS2020J07).

Hydride generation-atomic fluorescence spectrometry is an ideal tool for determination of selenium (Se). But the detection results of Se in the plant samples were lower due to the volatilization loss in the digestion process. Our experiments found the volatilization loss of Se when the standard solution was digested with HCl, HF and HClO₄, and heated to dryness, but there was no loss when it was digested with HNO₃ alone, indicating that the volatilization may be related to the existing of F and Cl. In this study, a new method was proposed, which could effectively inhibit the volatilization of Se by adding Ca²⁺. After adding 8 mL 0.015 g/mL Ca²⁺ to 0.5000 g plant samples and digesting with the mixed solvent of HNO₃-HClO₄ (15:2, V/V) on low temperature heating plate, Se was not volatilized even after the solution was heated to dryness. Simultaneously, it was found that the addition of Ca²⁺ could not affect the allowable amount of the co-existing interference elements. The detection limit of the method was 4.95 ng/g, and the precision was 2.56%-3.17%. The determined values for the different reference materials of plant were in agreement with the certified values.
- Hydride generation-atomic fluorescence spectrometry,
- Trace selenium,
- Plant samples,
- Volatilization,
- Loss
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