Determination of Mn, Fe, Ni, Cu, Zn, Cd and Pb in seawater using offline extraction and triple quadrupole ICP-MS/MS,Journal of Analytical Atomic Spectrometry

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Determination of Mn, Fe, Ni, Cu, Zn, Cd and Pb in seawater using offline extraction and triple quadrupole ICP-MS/MS
Journal of Analytical Atomic Spectrometry ( IF 3.1 ) Pub Date : 2018-01-09 00:00:00 , DOI: 10.1039/c7ja00237h
S. L. Jackson _{1,

2,

3,

4,

5} , J. Spence _{1,

2,

3} , D. J. Janssen _{1,

2,

3,

6,

7} , A. R. S. Ross _{1,

2,

3,

6,

7} , J. T. Cullen _{1,

2,

3}

Affiliation

Highly resolved temporal and spatial distributions of trace elements in ocean water can provide insight into ocean processes but carry a significant analytical demand which requires methods that combine accuracy and precision with high sample throughput. Here a multi-element method is presented which combines the commercially-available seaFAST preconcentration system with ICP-MS/MS for the analysis of Mn, Fe, Ni, Cu, Zn, Cd and Pb in seawater. Samples (20 mL or 40 mL) are loaded on to a chelation resin column and trace metals eluted into 2.5 mL of 1.6 N HNO₃. Analysis of the eluate was carried out by ICP-MS/MS, which combines two mass-selecting quadrupoles separated by an octopole collision/reaction cell. The collision/reaction cell was pressurized with O₂ gas for the analysis of Mn, Ni, Cu, Cd and Pb and H₂ gas for the analysis of Fe and Zn, which removed common interferences (e.g. ArO⁺ on ⁵⁶Fe and MoO⁺ on Cd) yet maintained the highest instrument sensitivity across the entire mass range. Measured blanks and detection limits were ≤0.050 nmol L⁻¹ levels, except for the Fe (blank 0.14 nmol L⁻¹) and were suitable for open-ocean seawater analysis. We report results for the certified reference material NASS-6, consensus reference standards SAFe S and SAFe D and depth profiles of trace metals from the Arctic Ocean, collected as part of the Canadian GEOTRACES program.

中文翻译：

离线萃取和三重四极杆ICP-MS / MS测定海水中的Mn，Fe，Ni，Cu，Zn，Cd和Pb

海水中微量元素的高度时空分布可以提供对海洋过程的洞察力，但对分析的要求很高，这就要求将准确度和精确度与高样品通量相结合的方法。在这里，提出了一种将市售的seaFAST预浓缩系统与ICP-MS / MS结合使用的多元素方法，用于分析海水中的Mn，Fe，Ni，Cu，Zn，Cd和Pb。将样品（20 mL或40 mL）上样到螯合树脂柱上，并将痕量金属洗脱到2.5 mL的1.6 N HNO _3中。洗脱液的分析是通过ICP-MS / MS进行的，它结合了两个通过八极杆碰撞/反应池分隔的质量选择四极杆。碰撞/反应池用O ₂加压用于分析Mn，Ni，Cu，Cd和Pb的气体以及用于分析Fe和Zn的H ₂气体，消除了常见的干扰（例如，⁵⁶ Fe上的ArO ⁺和Cd上的MoO ⁺），但仍保持了最高的仪器灵敏度整个质量范围。除铁（空白0.14 nmol L ^-1）外，测得的空白和检出限为≤0.050nmol L ^-1，并且适用于大洋海水分析。我们报告经认证的参考材料NASS-6，共识参考标准SAFe S和SAFe D的结果，以及作为加拿大GEOTRACES计划的一部分而收集的来自北冰洋的痕量金属的深度剖面。

更新日期：2018-01-09

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