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首页> 外文期刊>Environmental Science & Technology >Online Preconcentration-IC-ICP-MS for Selenium Quantification and Speciation at Ultratraces
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Online Preconcentration-IC-ICP-MS for Selenium Quantification and Speciation at Ultratraces

机译：在线痕量富集-IC-ICP-MS用于超痕量硒的定量和形态分析

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摘要

Selenium (Se) is of key importance to human health with a very narrow concentration range of optimal dietary intake. Due to the inherent analytical challenge linked with the low natural abundance, information on precise and accurate Se speciation in deficient environments is hardly existent. This study presents a novel approach to determine Se species-specifically at ultratraces, by online coupling of a preconcentration (trap) column to an ion chromatography inductively coupled plasma mass spectrometry (IC-ICP-MS) system. It is demonstrated that with this robust and work/time efficient method, the predominant selenium oxyanions, selenite (Se~(IV)) and selenate (Se~(VI)), can be quantified down to 7.3 and 8.3 picogram total Se, respectively, in an overall analytical time of 420 s, only. The applicability for environmental samples was proven on pristine volcanic ashes collected from seven different volcanoes. The high sensitivity of the novel approach allowed to determine speciation in samples that were strongly depleted in total selenium (<0.05 mg kg~(-1) Se) with only minor fractions of Se mobilized (i.e., less than 10% of the total selenium was leached in 10 out of 12 samples). The studied samples showed considerate differences in selenium speciation, with selenite and selenate co-occurring in most samples. The fact that the studied sample leachates had a wide range of pH (3.78-9.55) and major anion/cation composition underlines the versatility and wide potential application range of the method presented.
机译：硒对人体健康至关重要，其最佳饮食摄入浓度范围非常狭窄。由于固有的分析挑战与低自然丰度相关联，因此几乎不存在有关在贫乏环境中进行精确和准确的硒形态分析的信息。这项研究提出了一种新方法，可通过将预浓缩（捕集）柱在线耦合到离子色谱电感耦合等离子体质谱仪（IC-ICP-MS）来确定超痕量硒。结果表明，通过这种鲁棒且工作/时间高效的方法，可以将主要的硒氧阴离子，亚硒酸盐（Se〜（IV））和硒酸盐（Se〜（VI））分别量化为总硒的7.3和8.3皮克。 ，仅需420 s的整体分析时间。在从七个不同的火山收集的原始火山灰中证明了环境样品的适用性。这种新方法的高灵敏度允许测定样品中的形态，这些样品中的硒含量极低（<0.05 mg kg〜（-1）Se），而硒的含量很少（小于硒总量的10％）从12个样品中的10个中浸出）。所研究的样品显示硒形态上的差异很大，大多数样品中同时存在亚硒酸盐和硒酸盐。所研究的样品浸出液具有宽范围的pH值（3.78-9.55）并且主要的阴离子/阳离子组成这一事实突显了该方法的多功能性和广泛的潜在应用范围。

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  • 来源
    《Environmental Science & Technology》 |2012年第21期|11988-11994|共7页
  • 作者

    Markus Lenz; Geerke H. Floor; Lenny H. E. Winkel; Gabriela Roman-Ross; Philippe F. X. Corvini;

  • 作者单位

    Institute for Ecopreneurship, University of Applied Sciences and Arts Northwestern Switzerland (FHNW), School of Life Sciences, Gruendenstrasse 40, 4132 Muttenz, Switzerland,Sub-Department of Environmental Technology, Wageningen University, 6700 EV Wageningen, The Netherlands;

    Department of Chemistry, University of Girona, Campus de Montilivi s., 17071 Girona, Spain,Institute for Reference Materials and Measurements, Joint Research Centre - European Commission, Retieseweg 111, 2440 Geel, Belgium;

    Institute of Biogeochemistry and Pollutant Dynamics, Department of Environmental Sciences, ETH Zuerich, CH-8092 Zuerich, Switzerland,Swiss Federal Institute of Aquatic Science and Technology (Eawag), UEberlandstrasse 133, Postfach 611, 8600 Duebendorf, Switzerland;

    Department of Chemistry, University of Girona, Campus de Montilivi s., 17071 Girona, Spain,Amphos 21 Consulting S. L., Passeig de Garcia i Faria 49, 08019 Barcelona, Spain;

    Institute for Ecopreneurship, University of Applied Sciences and Arts Northwestern Switzerland (FHNW), School of Life Sciences, Gruendenstrasse 40, 4132 Muttenz, Switzerland,School of the Environment, Nanjing University, 22# Hankou Rd., Nanjing, 210093, People's Republic of China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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