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首页> 外文OA文献 >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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GEOTRACES intercalibration of neodymium isotopes and rare earth element concentrations in seawater and suspended particles. Part 1: reproducibility of results for the international intercomparison

机译：GEOTRACES校准海水和悬浮颗粒中钕同位素和稀土元素的浓度。第1部分：国际比对结果的可重复性

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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. © 2012, by the American Society of Limnology and Oceanography, Inc.
机译：国际GEOTRACES计划初始阶段的一项重要活动是进行广泛的国际相互校准工作，以确保可以有意义地比较来自不同航次和来自不同实验室的一系列痕量元素和同位素（TEI）的结果。在这里，我们介绍了海水和海洋颗粒中钕同位素和稀土元素相互校准工作的结果。 15个不同的实验室报告了在三个不同位置（BATS 15 m，BATS 2000 m，SAFe 3000 m）在海水中溶解的143Nd / 144Nd比率的结果，总体一致性在47至57 ppm（平均值的2σ标准偏差）之内。在13个实验室（56 ppm）进行的未知纯Nd标准溶液的分析中也发现了类似的协议，这表明质谱是实现准确和精确的Nd同位素比的主要变量。总体而言，该结果非常令人满意，因为获得的精度比在全球海洋中观测到的Nd同位素组成范围高40倍。六个实验室在BATS的两个水深处对溶解的稀土元素浓度（REE）进行了相互校准，结果发现除Ce以外，所有REE的重现性均达到15％或更高，而Ce似乎是对空白最敏感的REE。来自12个实验室的钕浓度在9％以内达成一致，反映了目前可能的最佳再现性。 Nd同位素组成和海洋颗粒上REE浓度的结果尚无定论，将来应重新研究。 ©2012，美国美国湖泊科学与海洋学学会版权所有。

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