Calibrating standards using chemical reagents for glass bead x-ray fluorescence analyses of geochemical samples
Calibrating standards using chemical reagents for glass bead x-ray fluorescence analyses of geochemical samples
复制标题
使用化学试剂校准地球化学样品玻璃珠 X 射线荧光分析标准品
DOI：
10.1002/xrs.1042
复制
发表时间：
2008
影响因子：
1.2
通讯作者：
Toshihiro Nakamura
中科院分区：
文献类型：
--
作者：
K. Nakayama;Toshihiro Nakamura
讨论了化探样品玻璃微珠X射线荧光(XRF)分析的校准标准。尽管地质组织发布的岩石参考文献经常应用于玻璃微珠XRF，但仍然存在几个问题：品种和数量有限，以及与未经认证(推荐或首选)值相关的不确定性。具有广泛元素组成的各种地质参照物(例如岩石、沉积物和材料)经常被用于校准。必须使用适当的矩阵校正方法对XRF强度进行校正，因为应用各种参考文献所产生的矩阵效应是不可忽略的。为了扩大地质参照物的定标范围，人们采取了混合参照物和在参照物中加入化学试剂等方法。然而，校准标准的地质参照物应原封不动地使用，因为参照物认证值的可靠性会丢失。用化学试剂合成的标准物质具有优于岩石标准物质的本构特性。合成标准可以保证分析过程的可追溯性和结果校准曲线的准确性和适当性。通过设计标图数量、标图布置、标定范围等参数，可以得到可靠的标定曲线。合成标准必须通过将元素组成与每个地质样品相匹配来制备。本文综述了与玻璃微珠XRF相关的岩石参考或化学试剂的校准标准。版权所有©2008 John Wiley&Sons，Ltd.
Calibration standards for glass bead x-ray fluorescence (XRF) analysis of geochemical samples are discussed in this article. Although rock references issued by geological organizations have often been applied to glass bead XRF, several problems remain: limited varieties and numbers, and uncertainty related to uncertified (recommended or preferred) values. Various geological references (e.g. rocks, sediments, and materials) having extensive elemental composition have often been applied for calibration. The XRF intensities must be corrected using an appropriate matrix-correction method because the matrix effect resulting from the application of various references was not negligible. Attempts have been made to extend the calibration range by geological reference with such approaches as blending some references and adding chemical reagents to references. However, geological references for the calibrating standards should be used intact because the reliability of the certified values of references is lost. Synthesized calibrating standards with chemical reagents have constitutive properties which are superior to those of the rock references. Synthesized standards can ensure the traceability of the analytical procedure and the resultant accuracy and propriety of calibration curves. Reliable calibration curves are obtainable by designing such parameters as the number of plots, plotting arrangements, and calibrating ranges. Synthesized standards must be prepared by fitting the elemental composition to each geological sample. This discussion reviews calibration standards applying rock references or chemical reagents related to glass bead XRF. Copyright © 2008 John Wiley & Sons, Ltd.