Use of Scattered Secondary Target Radiation in EDXRF Analysis: A Fundamental-Parameter Method for Matrix Correction

O’Reilly, Tom; King, Bi‐Shia

doi:10.1154/s0376030800021261

Cited by 4 publications

(2 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The algorithm MARS (Multielement Analysis Routine using Scatter) corrects the light element absorption on the basis of the mean atomic number of the sample, which is determined from the ratio of the incoherently and coherently scattered (Compton and Rayleigh) intensity radiation by the sample. 9 Pure compounds pellets [C 6 H 10 O 5 , H 3 BO 3 , NaNO 3 , (NH 4 2 SO 4 , KNO 3 and CaCO 3 ] were used to establish the correlations between the intensities of the Compton and Rayleigh scattered x-rays of the Ag secondary target by the irradiated sample and the average atomic number (Z). Ratios of the incoherently and coherently scattered x-rays by the sample, using the Ag secondary target, were highly correlated (r D 0.995) with the atomic number, within the range 6.68 < Z < 12.56 ( Fig.…”

Section: Calibration For the Light Matrixmentioning

confidence: 99%

Elemental composition of marine sponges from the Berlengas natural park, western Portuguese coast

et al. 2003

View full text Add to dashboard Cite

Analytical studies of sponges have recently become a matter of interest, since these organisms have been reported to accumulate high levels of some elements, including heavy metals, which may have an anthropogenic origin, allowing their application as environmental pollution indicators. In the present work, 35 sponges collected in August 1998 at the Berlengas Natural Park were classified and analysed by secondary target energy-dispersive x-ray fluorescence spectrometry (EDXRF). Some major, minor and trace elements could be determined: Al, Si, K, Ca, Ti, Mn, Fe, Ni, Cu, Zn, As, Br, Rb, Sr, Zr, I and Pb. To assess some local influences on the sponge composition, two sediment samples were also taken from the area and analysed. Besides these elements, sponges are constituted by fairly high percentages of elements that do not emit characteristic x-ray lines. Therefore, absorption corrections for quantitative calculations were carried out taking into account the ratio between the inelastic and elastic scattered incident radiation from a silver secondary target to calculate the mean atomic number of the light matrix. Calibration was performed using chemical compounds and standard reference materials. Precision, accuracy and detection limits for the range of elements determined by the method are particularly suitable for the chemical analysis of these organisms. Results for the sediment chemical composition indicated the existence of high Ca and low Si levels and confirmed the absence of any trace metal contamination in the region. The sponge composition showed low Si contents, even in siliceous specimens. Certain high elemental contents determined in some species indicated a clear selective bioaccumulation of particular trace elements, such as Ni, Zn and As, which is not dependent on local influences.

show abstract

Section: Calibration For the Light Matrixmentioning

confidence: 99%

Elemental composition of marine sponges from the Berlengas natural park, western Portuguese coast

et al. 2003

View full text Add to dashboard Cite

show abstract

“…This is somewhat arbitrary and other limits can be considered, e.g. the upper limit can be incremented by 2. zb < z l , mean zc (12) Next, the concentration of hypothetical elements can be calculated from the following equations :…”

Section: Calculation Of Average Atomic Numbermentioning

confidence: 99%

A procedure using polychromatic excitation and scattered radiation for matrix correction in x‐ray microfluorescence analysis

Lankosz

Pella

1995

X-Ray Spectrometry

View full text Add to dashboard Cite

A fundamental-parameters method using x-ray tube excitation was developed for use in the x-ray microfluorescence analysis of flat, optically polished geological specimens. In this procedure, the coherent and incoherent tube target lines scattered from the sample are used to calculate the average atomic number and mass thickness of the sample. The polychromatic tube spectral distribution is calculated from a published algorithm. Since elements such as carbon, bydrogen and oxygen are unmeasurable, their contribution for the purposes of matrix correction can be represented by two hypothetical elements which span each side of the calculated average atomic number of the low-Z matrix. This procedure is applicable to infinitely thick samples and also those of intermediate thickness, and was tested on glasses of known composition.

show abstract

Geochemical tracers of northern Portuguese estuarine sediments on the shelf

Araújo

Jouanneau

Valério

et al. 2002

Progress in Oceanography

View full text Add to dashboard Cite

Use of Scattered Secondary Target Radiation in EDXRF Analysis: A Fundamental-Parameter Method for Matrix Correction

Cited by 4 publications

References 7 publications

Elemental composition of marine sponges from the Berlengas natural park, western Portuguese coast

Elemental composition of marine sponges from the Berlengas natural park, western Portuguese coast

A procedure using polychromatic excitation and scattered radiation for matrix correction in x‐ray microfluorescence analysis

Geochemical tracers of northern Portuguese estuarine sediments on the shelf

Contact Info

Product

Resources

About