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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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