Fast Determination of Rare Earth Elements in Tea Samples by ICP-MS with Modified Oxygen Flask Combustion
10.11895/j.issn.0253-3820.160348
- VernacularTitle:改进的氧瓶燃烧法结合电感耦合等离子体质谱快速测定茶叶样品中的稀土元素含量
- Author:
Zhou ZHOU
;
Junfang GUO
;
Taicheng DUAN
;
Kailun HUANG
;
Jiagui NING
- Publication Type:Journal Article
- Keywords:
Oxygen flask combustion;
Inductively coupled plasma-mass spectrometry;
Tea samples;
Rare earth element
- From:
Chinese Journal of Analytical Chemistry
2016;44(9):1359-1364
- CountryChina
- Language:Chinese
-
Abstract:
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.
