Prediction of absolute concentrations of elements from SR XRF scan measurements of natural wet sediments

X‐ray fluorescence core scanning of wet marine sediments: methods to improve quality and reproducibility of high‐resolution paleoenvironmental records

“…In lacustrine sediments, Rayleigh/ Compton scattering intensities may serve as proxy for the water content (Phedorin and Goldberg 2005) in a similar way as Cl intensities for marine sediments.…”

“…The pore water in the sediment not only dilutes the solid phase, but also absorbs the X-ray radiation of the sample resulting in lower intensities of the target elements as well as lower measurement precision and accuracy with a poorer detection limit (Ge et al 2005;Phedorin and Goldberg 2005). This absorption predominantly influences weaker fluorescence energies, which in accordance with Moseley's law relate primarily to elements with a lower atomic number such as aluminum and silicon (Tjallingii et al 2007).…”

Scanning SRXF analysis and isotopes of uranium series from bottom sediments of Siberian lakes for high-resolution climate reconstructions

“…The spectral responses with obtaining absolute concentrations of elements from their fluorescent peaks were processed using the algorithm of fundamental parameters to overcome problems caused by water content variability in nearly saturated wet sediments. The processing algorithm of spectra from thick slices of wet sediments and the uranium profile in core st2 from Lake Baikal with 1 mm resolution are reported in [9]. The 234 U/ 238 U ratio was measured by ICP-MS at a 1 cm sampling interval [5], i.e., 10 times longer than in SRXFA for 238 U [9].…”

“…The processing algorithm of spectra from thick slices of wet sediments and the uranium profile in core st2 from Lake Baikal with 1 mm resolution are reported in [9]. The 234 U/ 238 U ratio was measured by ICP-MS at a 1 cm sampling interval [5], i.e., 10 times longer than in SRXFA for 238 U [9]. The profile of 234 U/ 238 U ratios is rather smooth [5] unlike that of absolute 238 U concentrations [9].…”

A reconstruction of the thawing of the permafrost during the last 170years on the Taimyr Peninsula (East Siberia, Russia)

“…The spectra were collected in a scanning mode with 23 and 45 keV beams (Zolotarev et al, 2001). The spectral responses of the absolute concentrations of elements from their fluorescent peaks were processed using the algorithm of fundamental parameters to overcome problems caused by water content variability in nearly saturated wet sediments (Phedorin and Goldberg, 2005).…”