Citation:
ZHOU Zhou, GUO Jun-Fang, DUAN Tai-Cheng, HUANG Kai-Lun, NING Jia-Gui. Fast Determination of Rare Earth Elements in Tea Samples by ICP-MS with Modified Oxygen Flask Combustion[J]. Chinese Journal of Analytical Chemistry,
;2016, 44(9): 1359-1364.
doi:
10.11895/j.issn.0253-3820.160348
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A new method for accurate determination of 15 rare earth elements including Y-Lu in tea samples by inductively coupled plasma-mass spectrometry(ICP-MS) was proposed. Sample preparation was based on the modified oxygen flask combustion technique. By using quartz cloth coated with glycerol instead of filter paper as the ignition agent, a total amount of 0.1 g sample could be completely burned in a 500-mL flask. Key factors affecting the sample preparation effect were systematically investigated, and it was found that the extraction efficiencies of over 90% for all the analytes could be realized with 5 mL of 4% HNO3 +1% HF (V/V) as the extractant for the combustion residue and the total extraction process could be finished in one minute under sonication, which resulted in a very fast sample preparation procedure that could be completed in less than 3 minutes. The relative standard deviations (RSD) of six parallel determination values were between 2.7% and 5.5%, and the detection limits ranged from 0.001 mg/kg to 0.006 mg/kg. Three tea standard reference materials were analyzed with the method and the detection results agreed well with the standard values. The method was successfully applied to three real samples analysis.
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