Determination of Reference Values for NIST SRM 610-617 Glasses Following ISO Guidelines
Determination of Reference Values for NIST SRM 610-617 Glasses Following ISO Guidelines
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DOI：
10.1111/j.1751-908x.2011.00120.x
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发表时间：
2011-12-01
影响因子：
3.8
通讯作者：
Enzweiler, Jacinta
中科院分区：
文献类型：
--
作者：
Jochum, Klaus Peter;Weis, Ulrike;Enzweiler, Jacinta
我们提出了新的参考值的NIST SRM 610617眼镜以下ISO准则和国际协会的地球分析师协议。已测定了95%置信水平（CL）下的不溶性，用于散装和微量分析目的。与以前的汇编程序相比，这种方法提供的数据考虑到了当今的数据质量要求。新的分析数据和GeoReM数据库的几乎完整的数据集被用于这项研究。通过应用Horwitz函数和仔细研究分析方法检查数据质量。我们已经确定了定量可能的元素不均匀性使用不同的测试部分质量为1，0.1和0.02 μ g。尽管避免了玻璃晶片的边缘区域，但我们发现了几种亲铜/亲铁元素的中度不均匀性，以及小测试部分质量下Ni、Se、Pd和Pt的总体不均匀性。不均匀性的程度包括在不确定度的确定中。虽然新的参考值与NIST认证值一致，但SRM 610中的Mn除外，但它们通常与当前使用的皮尔斯（1997）值相差多达10%。在少数情况下（P、S、Cl、Ta、Re），差异甚至更大。
We present new reference values for the NIST SRM 610617 glasses following ISO guidelines and the International Association of Geoanalysts protocol. Uncertainties at the 95% confidence level (CL) have been determined for bulk- and micro-analytical purposes. In contrast to former compilation procedures, this approach delivers data that consider present-day requirements of data quality. New analytical data and the nearly complete data set of the GeoReM database were used for this study. Data quality was checked by the application of the Horwitz function and by a careful investigation of analytical procedures. We have determined quantitatively possible element inhomogeneities using different test portion masses of 1, 0.1 and 0.02 mu g. Although avoiding the rim region of the glass wafers, we found moderate inhomogeneities of several chalcophile/siderophile elements and gross inhomogeneities of Ni, Se, Pd and Pt at small test portion masses. The extent of inhomogeneity was included in the determination of uncertainties. While the new reference values agree with the NIST certified values with the one exception of Mn in SRM 610, they typically differ by as much as 10% from the Pearce (1997) values in current use. In a few cases (P, S, Cl, Ta, Re) the discrepancies are even higher.