Heterogeneity effects in direct x‐ray fluorescence analysis of hair
作者:
Sz. Török,
P. Van Dyck,
R. Van Grieken,
期刊:
X‐Ray Spectrometry
(WILEY Available online 1984)
卷期:
Volume 13,
issue 1
页码: 27-32
ISSN:0049-8246
年代: 1984
DOI:10.1002/xrs.1300130106
出版商: Wiley Subscription Services, Inc., A Wiley Company
数据来源: WILEY
摘要:
AbstractThe methodology of direct hair analysis by energy‐dispersive x‐ray fluorescence was studied. The effect on the XRF result of having a non‐homogeneous radial distribution of the analyte in a single hair strand and the macroscopic effects in a bundle of hairs were calculated to evaluate possible systematic errors. The detection limits were mapped as a function of the target thickness and surface fraction. It appeared that a 10 mg cm−2sample thickness, i. e. a target with about four layers of hair strands, is recommended. The standard deviation of this simple direct analytical method is 6–19% for some important elements. Discrepancies with neutron activation analysis had a mean value of around 15%. About twelve elements can be determined simultaneously on a rout
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