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首页> 外文期刊>Analytica chimica acta >Triethylamine-assisted Mg(OH)(2) coprecipitation/preconcentration for determination of trace metals and rare earth elements in seawater by inductively coupled plasma mass spectrometry (ICP-MS)
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Triethylamine-assisted Mg(OH)(2) coprecipitation/preconcentration for determination of trace metals and rare earth elements in seawater by inductively coupled plasma mass spectrometry (ICP-MS)

机译：三乙胺辅助Mg（OH）（2）COPRECIPITITIT /前浓缩，通过电感耦合等离子体质谱法测定海水中痕量金属和稀土元素（ICP-MS）

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In this paper, we report an improved magnesium hydroxide, Mg(OH)(2), coprecipitation method for the determination of 16 trace elements (Al, V, Cr, Mn, Mn, Fe, Co, Ni, Cu, Zn, Ga, As, Se, Sb, Sn and Pb) and 18 rare earth elements (REEs), including Sc, Y, U and Th in seawater and estuarine water samples. The procedure involves coprecipitation of the trace elements and REEs on Mg(OH)(2) upon addition of a small volume of triethylamine (TEA) followed by analysis of the dissolved pellet solutions by inductively coupled plasma mass spectrometry (ICP-MS). Three-step sequential coprecipitation was carried out on 10 mL aliquots of seawater to eliminate the matrix ions and to preconcentrate the analytes of interest into a 1 mL final volume. Spike recoveries varied from 85% (Th) to 105% (Y). Calcium (Ca), sodium (Na) and potassium (K) matrices were virtually eliminated from the analysis solutions. Collision reaction interface (CRI) technology utilizing H-2 and He gases was employed to determine its effectiveness in removing the spectral interferences originating from the residual Mg matrix, TEA and plasma gases. H2 was more effective than He in reducing spectral interferences from TEA and plasma gases. Limits of detection (LODs) ranged from 0.01 ng L-1 (Ho) to 72 ng L-1 (Al). The method was validated by using certified seawater (CASS-4) and estuarine water (SLEW-3) reference materials. Precision for five (n = 5) replicate measurements were between 1.2% (Pr) and 18% (Lu). Fe, Pb, Sn, and Zn impurities in TEA were significant in comparison to the levels in CASS-4 and SLEW-3, while relatively high background signals impacted determinations of low levels of Sc and Th. The effects of these hurdles on precision and accuracy were alleviated by measuring these elements in spiked CASS-4 and SLEW-3. (C) 2018 Elsevier B.V. All rights reserved.
机译：在本文中，我们报告了一种改进的氢氧化镁，Mg（OH）（2），CopRecipition方法，用于测定16种痕量元素（Al，V，Cr，Mn，Mn，Fe，Co，Ni，Cu，Zn，Ga ，作为Se，Sb，Sn和Pb）和18个稀土元素（REES），包括SC，Y，U和TH在海水和河口水样中。该方法涉及在加入小体积的三乙胺（TEA）后，通过电感耦合等离子体质谱（ICP-MS）分析溶解的沉淀溶液的少量三乙胺（OH）（2）上的微量元素和REEES在Mg（OH）（2）上的共沉淀。在10ml等分试样的海水上进行三步顺序共沉淀，以消除基质离子并将目的的分析物预培养至1mL最终体积。尖峰回收率从85％（Th）变化至105％（Y）。实际上消除了分析溶液实际上消除了钙（Ca），钠（Na）和钾（K）基质。采用H-2和HE气体的碰撞反应界面（CRI）技术来确定其在去除源自残留的MG基质，茶叶和等离子体气体的光谱干扰方面的有效性。 H2比降低茶叶和血浆气体的光谱干扰更有效。检测限（LOD）范围为0.01ng L-1（HO）至72ng L-1（A1）。通过使用认证的海水（CASS-4）和河口水（SLEW-3）参考资料来验证该方法。五（n = 5）复制测量的精度为1.2％（PR）和18％（LU）。与CASS-4和SLOW-3的水平相比，茶中的Fe，Pb，Sn和Zn杂质是显着的，而相对高的背景信号影响较低的SC和TH的确定。通过测量尖刺的CASS-4和SLEW-3中这些元素，减轻了这些障碍对精确和准确性的影响。 （c）2018 Elsevier B.v.保留所有权利。

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