Energy Dispersive X-ray Spectral Analysis Research Articles

Elemental Analysis of Environmental Samples by Total Reflection X-Ray Fluorescence: a Review

A review of total reflection x-ray fluorescence (TXRF) as an effective excitation mode for energy-dispersive x-ray spectral analysis is presented. The instrumental conditions of excitation under grazing incidence (ψ < 0.1°) are emphasized and the analytical features of powerful detection and simple and reliable quantification are characterized. The applicability of TXRF to environmental analyses is illustrated by some typical examples. The analysis of pure water samples leads to detection limits at the ppt (ng/l) level. A special matrix separation is only needed for river, sea and waste waters. The analysis of air dust is directly possible with a sampling volume of 1 m 3 and a sampling time of 1 h. Organ tissue can be analysed down to the lower ppm range after freeze-cutting of μm thick sections. Plant material has to be pulverized and digested prior to analysis, e.g. with nitric acid In combination with a chromatographic separation, speciation is made possible for small 0.5 ml fractions, e.g. for vegetable foodstuffs. For all these applications a multi-element determination can be carried out, for about 20-25 elements simultaneously. Simple and reliable quantification is effected by internal standardization. The reliability of the method has been proved by intercomparison tests. Second-generation instruments that are compact and user-friendly are now commercially available.

Interpretation of in situ logging p-wave velocities in sediments over very young crust

Laboratory and downhole logging measurements on sediments in the Lau back arc basin display none of the expected trends in physical and acoustic properties as a function of depth. Insitu, the sediments are underconsolidated, although in the lab the sediments can consolidate normally, as shown by measuring both compressional and shear wave velocity in a controlled laboratory triaxial setting. Both compressional and shear wave velocity, measured in the triaxial cell after consolidation to estimated insitu pressures, are significantly higher than those measured insitu. The primary reason that sediments are not consolidating insitu, and therefore, compressional and shear wave velocity are not decreasing downhole, is that water lost during the consolidation process is rapidly replaced by fluids circulating through the system convectively. The undisturbed microfabrics of these sediments were examined by scanning electron microscopy equipped with energy dispersive x-ray spectral analysis and image analysis systems. This allowed quantitative measurement of pore space and degree (and type) of cementation. In general, compressional and shear wave velocity did not show consistent correlation with grain size distribution. Instead, variations in velocity within lithological units were related to the distribution of pore space and digenetic state of the sediment.

Phase distribution studies using energy dispersive X-ray spectral analysis

Etude de la distribution de phases dans les ceramiques par spectrometrie RX a dispersion d'energie

ChemInform Abstract: PRESENT STATE OF ENERGY‐DISPERSIVE X‐RAY SPECTRAL ANALYSIS USING SEMICONDUCTOR DETECTORS

Chemischer InformationsdienstVolume 10, Issue 44 Reviews ChemInform Abstract: PRESENT STATE OF ENERGY-DISPERSIVE X-RAY SPECTRAL ANALYSIS USING SEMICONDUCTOR DETECTORS YU. P. BETIN, YU. P. BETINSearch for more papers by this authorE. G. ZHABIN, E. G. ZHABINSearch for more papers by this author YU. P. BETIN, YU. P. BETINSearch for more papers by this authorE. G. ZHABIN, E. G. ZHABINSearch for more papers by this author First published: October 30, 1979 https://doi.org/10.1002/chin.197944369AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinkedInRedditWechat No abstract is available for this article. Volume10, Issue44October 30, 1979 RelatedInformation