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NOBIAS PA1螯合树脂富集——ICP-MS定量测定近海水体中的稀土元素
梁 杰1, 何会军1, 麻洪良1, 杨士凤1, 张 劲1,2
1.中国海洋大学 海洋化学理论与工程技术教育部重点实验室;2.富山大学 大学院地球环境生命
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)
Determination of REEs in the seawater adjacent to China using ICP-MS with a Nobias-chelate PA1 resin
LIANG Jie,HE Hui-jun,MA Hong-liang,YANG Shi-feng,ZHANG Jin
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
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