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| Determination of Heavy Rare Earth Element, Th and U in Geological Samples by Inductively Coupled Plasma-Mass Spectrometry |
| Received:April 24, 2016 Revised:May 31, 2016 |
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| DOI：doi:10.3969/j.issn.2095-1035.2016.04.006 |
| KeyWord:inductively coupled plasma-mass spectrometry, heavy rare earths; Th, U, geological sample |
| Author | Institution |
| DAI Xuefeng |
浙江省地质矿产研究所，杭州 |
| DONG Liming |
浙江省地质矿产研究所，杭州 |
| JIANG Zongming |
浙江省地质矿产研究所，杭州 |
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| Abstract: |
| A sample digestion method for simultaneous determination of heavy rare earth elements, Th and U in geological samples by inductively coupled plasma-mass spectrometry (ICP-MS) was improved. Acid dissolution method together with alkaline dissolution method were used to prepare sample solution. The samples were first dissolved with nitric acid, hydrochloric acid, hydrofluoric acid and perchloric acid medium. They were then extracted by hydrochloric acid (1+1) and the solutions were prepared by filtration. After the residue and filter paper were ashed, the samples were treated with alkali dissolution. The final solutions were used for the determination of heavy rare earth element, Th and U by ICP-MS. Increasing sample amount made the sample more representative. Two disadvantages, including lower measurement results obtained by acid dissolution due to the incompletion of sample digestion and the clogging of torch and the nebulizer of ICP-MS by the excessive salts in the process of alkaline dissolution, were overcome in this work. The method has been validated by determination of these elements in national standard reference materials and the results are in good agreement with the certified values with RSD of 1.0%-5.6%. The quantification limits for Y, Tb, Dy, Ho, Er, Tm, Yb, Lu, Th and U were 0.19, 0.017, 0.032, 0.008, 0.046, 0.004, 0.032, 0.005, 0.024, 0.069 μg/g, respectively. |
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