GEOTRACES intercalibration of neodymium isotopes and rare earth element concentrations in seawater and suspended particles. Part 1: reproducibility of results for the international intercomparison
GEOTRACES intercalibration of neodymium isotopes and rare earth element concentrations in seawater and suspended particles. Part 1: reproducibility of results for the international intercomparison
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DOI：
10.4319/lom.2012.10.234
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发表时间：
2012-04
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通讯作者：
T. van de Flierdt;K. Pahnke;H. Amakawa;P. Andersson;C. Basak;B. Coles;C. Colin;K. Crocket;M. Frank;N. Frank;S. Goldstein;Vineet Goswami;B. Haley;E. Hathorne;S. Hemming;G. Henderson;C. Jeandel;K. Jones;K. Kreissig;F. Lacan;M. Lambelet;E. Martin;D. Newkirk;H. Obata;L. Pena;A. Piotrowski;C. Pradoux;H. Scher;H. Schöberg;Sunil Kumar Singh;T. Stichel;H. Tazoe;D. Vance;Jingjing Yang
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文献类型：
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作者：
T. van de Flierdt;K. Pahnke;H. Amakawa;P. Andersson;C. Basak;B. Coles;C. Colin;K. Crocket;M. Frank;N. Frank;S. Goldstein;Vineet Goswami;B. Haley;E. Hathorne;S. Hemming;G. Henderson;C. Jeandel;K. Jones;K. Kreissig;F. Lacan;M. Lambelet;E. Martin;D. Newkirk;H. Obata;L. Pena;A. Piotrowski;C. Pradoux;H. Scher;H. Schöberg;Sunil Kumar Singh;T. Stichel;H. Tazoe;D. Vance;Jingjing Yang
国际GEOTRACES方案初始阶段的关键活动之一是开展广泛的国际相互校准工作，以确保能够以有意义的方式比较来自不同航行和不同实验室的一系列微量元素和同位素的结果。在这里，我们提出的结果，从相互校准的努力钕同位素和稀土元素在海水和海洋颗粒。15个不同的实验室报告了三个不同位置（BATS 15 m、BATS 2000 m、SAFe 3000 m）海水中溶解的143 Nd/144 Nd比值的结果，总体一致性在47至57 ppm范围内（平均值的2σ标准差）。一个类似的协议被发现由13个实验室（56 ppm）进行的一个未知的纯钕标准溶液的分析，表明质谱是实现准确和精确的钕同位素比的主要变量。总的来说，这一结果是非常令人满意的，因为所实现的精度比在全球海洋中观察到的Nd同位素组成范围高出40倍。在BATS的两个水深，六个实验室对溶解稀土元素浓度（REE）的相互校准产生了15%或更好的重现性，除了Ce，这似乎是最空白敏感的REE。来自12个实验室的NeoSodium浓度显示在9%以内的一致性，反映了目前可能的最佳再现性。结果Nd同位素组成和稀土元素浓度的海洋颗粒是不确定的，应该在未来重新审视。
One of the key activities during the initial phase of the international GEOTRACES program was an extensive international intercalibration effort, to ensure that results for a range of trace elements and isotopes (TEIs) from different cruises and from different laboratories can be compared in a meaningful way. Here we present the results from the intercalibration efforts on neodymium isotopes and rare earth elements in seawater and marine particles. Fifteen different laboratories reported results for dissolved 143Nd/144Nd ratios in seawater at three different locations (BATS 15 m, BATS 2000 m, SAFe 3000 m), with an overall agreement within 47 to 57 ppm (2σ standard deviation of the mean). A similar agreement was found for analyses of an unknown pure Nd standard solution carried out by 13 laboratories (56 ppm), indicating that mass spectrometry is the main variable in achieving accurate and precise Nd isotope ratios. Overall, this result is very satisfactory, as the achieved precision is a factor of 40 better than the range of Nd isotopic compositions observed in the global ocean. Intercalibration for dissolved rare earth element concentrations (REEs) by six laboratories for two water depths at BATS yielded a reproducibility of 15% or better for all REE except Ce, which seems to be the most blank‐sensitive REE. Neodymium concentrations from 12 laboratories show an agreement within 9%, reflecting the best currently possible reproducibility. Results for Nd isotopic compositions and REE concentrations on marine particles are inconclusive, and should be revisited in the future.