Modern sampling and analytical methods for the determination of trace elements in marine particulate material using magnetic sector inductively coupled plasma-mass spectrometry.
Modern sampling and analytical methods for the determination of trace elements in marine particulate material using magnetic sector inductively coupled plasma-mass spectrometry.
复制标题
使用扇形磁感应耦合等离子体质谱法测定海洋颗粒材料中微量元素的现代采样和分析方法。
DOI：
10.1016/j.aca.2010.07.037
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发表时间：
2010
影响因子：
6.2
通讯作者：
P. van der Merwe
中科院分区：
文献类型：
--
作者：
A. Bowie;A. Townsend;D. Lannuzel;T. Remenyi;P. van der Merwe
微量元素通常限制海洋中浮游植物的生长，对颗粒形式的量化对于充分了解其地球化学循环至关重要。目前缺乏对海洋微粒微量元素含量的可靠测量，部分原因是所采用的取样和分析方法不足。在这里，我们报告了一系列国家的最先进的痕量金属清洁方法的发展，收集和处理海洋颗粒物质在开放的海洋和海冰环境中，包括采样，粒度分级过滤，颗粒digestion和磁扇区电感耦合等离子体质谱（ICP-MS）分析。特别注意的是有证参考物质（CRM）和现场空白，这是典型的限制因素，准确分析海洋颗粒样品中的微量金属的低浓度的分析。所有17种元素的理论检测限（空白的3s）都很低，并且根据过滤器材料和孔隙率而变化（聚碳酸酯过滤器为sub-μgL− 1，石英和聚酯过滤器为1-2μgL− 1）。使用淡水标准物质验证了分析准确度，并记录了良好的回收率（93-103%）。利用沉积物和浮游生物标准物质对各种酸组合的消化效率进行了评估。用硝酸作介质，钼、镉、钡、铅、锰、铁、钴、镍、铜、锌、镓的回收率为79-90%。为了定量回收U、Al、V、Cr等难处理的微量元素，必须加入HF。生物活性元素如P也可以被分析并用作生物量标准化剂。在2007年国际极地年期间，我们开发的采样和分析方法在开放的南大洋和南极海冰环境中的两个主要实地项目中得到了可靠的应用。微量元素数据的悬浮和下沉的海洋物质中收集的颗粒样品，也在海冰芯。
Trace elements often limit phytoplankton growth in the ocean, and the quantification of particulate forms is essential to fully understand their biogeochemical cycling. There is presently a lack of reliable measurements on the trace elemental content of marine particles, in part due to the inadequacies of the sampling and analytical methods employed. Here we report on the development of a series of state-of-the-art trace metal clean methods to collect and process oceanic particulate material in open-ocean and sea ice environments, including sampling, size-fractionated filtration, particle digestions and analysis by magnetic sector inductively coupled plasma–mass spectrometry (ICP–MS). Particular attention was paid to the analysis of certified reference materials (CRMs) and field blanks, which are typically the limiting factor for the accurate analysis of low concentrations of trace metals in marine particulate samples. Theoretical detection limits (3s of the blank) were low for all 17 elements considered, and varied according to filter material and porosity (sub-μgL−1for polycarbonate filters and 1–2μgL−1for quartz and polyester filters). Analytical accuracy was verified using fresh water CRMs, with excellent recoveries noted (93–103%). Digestion efficiencies for various acid combinations were assessed using sediment and plankton CRMs. Using nitric acid only, good recoveries (79–90%) were achieved for Mo, Cd, Ba, Pb, Mn, Fe, Co, Ni, Cu, Zn and Ga. The addition of HF was necessary for the quantitative recovery of the more refractory trace elements such as U, Al, V and Cr. Bioactive elements such as P can also be analysed and used as a biomass normaliser. Our developed sampling and analytical methods proved reliable when applied during two major field programs in both the open Southern Ocean and Antarctic sea ice environments during the International Polar Year in 2007. Trace elemental data are presented for particulate samples collected in both suspended and sinking marine material, and also within sea ice cores.