| 摘要: |
| 稀土元素是海洋中一类极为重要的地球化学过程的示踪剂, 但因其浓度多在pmol/kg数量级,分析测试一直是难点, 为了使稀土元素在海洋研究中得到更广泛的应用, 必须对海洋中低浓度的稀土元素进行准确测量。本研究建立了NOBIAS PA1螯合树脂富集—ICP-MS法, 可以对近海的小体积水样中的稀土元素进行高准确度、高精密度分析。研究表明, 调节样品溶液pH为4.59～4.69、清洗溶液为6 mL 0.05 mol/L NH4AC、洗脱溶液为2 mL 1 mol/L HNO3时, 实验测试条件为最优。本方法对稀土元素的回收率在94%～106%, 检出限范围为0.001～0.424 pmol/kg, 分析精密度优于5%(n=5)。本研究所建立的方法, 可用于河水、海水与河口盐度梯度区稀土元素的分析。 |
| 关键词: 稀土元素 NOBIAS PA1 螯合树脂 固相萃取 小体积 近海水样 |
| DOI：10.11759/hykx20160331006 |
| 分类号: |
| 基金项目:国家自然科学基金项目(41276071, 41530965) |
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| Determination of REEs in the seawater adjacent to China using ICP-MS with a Nobias-chelate PA1 resin |
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LIANG Jie,HE Hui-jun,MA Hong-liang,YANG Shi-feng,ZHANG Jin
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| Abstract: |
| The concentration of rare earth elements (REEs) in seawater (pmol/kg) is generally estimated at the pmol/L level. As REEs are useful tools in the study of marine geochemistry, it is necessary to accurately determine their abundance in seawater. In this study, a highly sensitive and precise method is developed using the chelating resin Nobias-chelate PA1 in an offline preconcentration manifold. Magnetic sector detection using inductively coupled plasma mass spectrometry (ICP-MS) was used to analyze the REEs in coastal seawater samples. The optimal experimental parameters were determined when the pH ranges from 4.59–4.69, buffer volume is 6 mL, and elution volume is 2 mL. The detection limits of this method are 0.001 and 0.424 pmol/kg. The relative standard deviations (RSD) of the five replicate analyses of REEs in seawater were observed to be better than 5%. This method can be used to analyze REEs in rivers, estuaries, and seawater. |
| Key words: rare earth elements NOBIAS-chelate PA-1 solid-phase extractions small volume the adjacent China seawater sample |
