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| Determination of niobium, tantalum, lithium, beryllium, rubidium and tungsten in geological samples by mixed acid decomposition-inductively coupled plasma mass spectrometry ( ICP-MS ) |
| Received:May 16, 2023 Revised:December 05, 2023 |
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| DOI：10.3969/j.issn.2095-1035.2024.04.008 |
| KeyWord:ICP-MS ; rare elements ; geological samples ; large instruments ; standard substance; |
| Author | Institution |
| lizhen |
河南省地质局地质灾害防治中心 |
| wuzhe |
河南省地质局地质灾害防治中心 |
| wangjunyu |
河南省地质局地质灾害防治中心 |
| hujiazhen |
河南省地质局地质灾害防治中心 |
| zhonglixiang |
河南省地质局地质灾害防治中心 |
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| Abstract: |
| The contents of niobium, tantalum, lithium, beryllium, rubidium and tungsten in geological samples are quite different, and the contents of each element in the same sample are also quite different. For example, the content in the raw ore is only tens to hundreds of μg / g, while the content in the concentrate reaches several percent to tens of percent. The niobium and tantalum elements in the high content samples are unstable in the strong acidic solution and are easily hydrolyzed. Accurate determination of these elements requires a variety of methods, and the analysis process is cumbersome. Traditional analytical methods are complex and difficult to simultaneously determine multiple elements. A method for the simultaneous determination of niobium, tantalum, lithium, beryllium, rubidium and tungsten in geological samples by mixed acid decomposition-inductively coupled plasma mass spectrometry was established by investigating the selection of the amount of acid in the decomposition system, the selection of extractant, the selection of extractant and the selection of internal standard elements. In this paper, hydrofluoric acid-nitric acid-hydrochloric acid-perchloric acid-sulfuric acid was used to decompose the sample, and 3 ~ 4 drops of hydrofluoric acid + 5 % sulfuric acid + 5 % hydrogen peroxide extraction system was used to replace conventional organic acids ( tartaric acid, etc. ). ) Extraction system. ICP-MS was used to simultaneously determine the different contents of niobium, tantalum, lithium, beryllium, rubidium and tungsten in each content section. The national primary standard materials GBW07155, GBW07153 and GBW07185 were determined by this method. The results showed that there was no significant error between the test results and the certified values of each element. The precision RSD ( n = 6 ) was 0.45 % -4.05 %, and the accuracy ? lgC ( n = 6 ) was between-0.008 % and 0.009 %, which was suitable for the determination of niobium, tantalum, lithium, beryllium, rubidium and tungsten in geological samples. |
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