The iBox-FC: A new containment vessel for Itrax X-ray fluorescence core-scanning of freeze cores

Gregory, Braden R.B.; Patterson, R. Timothy; Reinhardt, Eduard G.; Galloway, Jennifer M.

doi:10.1016/j.quaint.2018.09.008

Cited by 10 publications

(13 citation statements)

References 15 publications

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“…Error bars show the precision of I rs (ip)/I d (ip) (AEsigma %: absolute error). Gregory et al, 2019) and Avaatech XRF core scanner (Avaatech BV, Alkmaar, The Netherlands; Hennekam et al, 2019). The concentrations of eight elements derived from the resin-corrected XRF intensities using the calibration lines show similar patterns on the concentrations as measured using the conventional bead-XRF and corder analyses ( Fig.…”

Section: Calibration Of Micro-x-ray Fluorescence Scanning Spectroscopmentioning

confidence: 75%

“…On the other hand, the multivariate log‐ratio calibration (MLC) approach is a useful method for correcting detection efficiency as well as matrix effect, which allows conversion from corrected intensities to concentrations based on the line y = x (Weltje et al ., ). Studies that recently applied this approach and show successful results are reported for the Itrax‐XRF core logger (Cox Analytical Systems; Gregory et al ., ) and Avaatech XRF core scanner (Avaatech BV, Alkmaar, The Netherlands; Hennekam et al ., ).…”

Section: Results and Assessmentmentioning

confidence: 99%

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Quantitative micro‐X‐ray fluorescence scanning spectroscopy of wet sediment based on the X‐ray absorption and emission theories: Its application to freshwater lake sedimentary sequences

et al. 2019

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Micro‐X‐ray fluorescence scanning spectroscopy of marine and lake sedimentary sequences can provide detailed palaeoenvironmental records through element intensity proxy data. However, problems with the effects of interstitial pore water on the micro‐X‐ray fluorescence intensities have been pointed out. This is because the X‐ray fluorescence intensities are measured directly at the surfaces of split wet sediment core samples. This study developed a new method for correcting X‐ray fluorescence data to compensate for the effects of pore water using a scanning X‐ray analytical microscope. This involved simultaneous use of micro‐X‐ray fluorescence scanning spectroscopy and an X‐ray transmission detector. To evaluate the interstitial pore water content from the X‐ray transmission intensities, a fine‐grained sediment core retrieved from Lake Baikal (VER99‐G12) was used to prepare resin‐embedded samples with smooth surfaces and uniform thickness. Simple linear regression between the linear absorption coefficients of the samples and their porosity, based on the Lambert–Beer law, enabled calculation of the interstitial pore spaces and their resin content with high reproducibility. The X‐ray fluorescence intensities of resin‐embedded samples were reduced compared with those of dry sediment samples because of: (i) the X‐ray fluorescence absorption of resin within sediment; and (ii) the sediment dilution effects by resin. An improved micro‐X‐ray fluorescence correction equation based on X‐ray fluorescence emission theory considers the instrument's sensitivity to each element, which provides a reasonable explanation of these two effects. The resin‐corrected X‐ray fluorescence intensity was then successfully converted to elemental concentrations using simple linear regression between the data from micro‐X‐ray fluorescence scanning spectroscopy and from the conventional analyzer. In particular, the calculated concentration of SiO2 over the depth of the core, reflecting diatom/biogenic silica concentration, was significantly changed by the calibrations, from a progressively decreasing trend to an increasing trend towards the top of the core.

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Section: Calibration Of Micro-x-ray Fluorescence Scanning Spectroscopmentioning

confidence: 75%

Section: Results and Assessmentmentioning

confidence: 99%

Quantitative micro‐X‐ray fluorescence scanning spectroscopy of wet sediment based on the X‐ray absorption and emission theories: Its application to freshwater lake sedimentary sequences

et al. 2019

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“…The core was prepared for Itrax-XRF analysis following procedures outlined by Gregory et al (2019b). Core CON01 was cut length-wise using a ripsaw into an approximately 3cm-wide section, then subdivided into nine approximately 12.5-cm-long slabs using a finebladed hacksaw so as to minimize loss of information; cores were subsequently recleaned to eliminate contamination that may have occurred during slabbing.…”

Section: Geochemical Analysismentioning

confidence: 99%

“…Core CON01 was cut length-wise using a ripsaw into an approximately 3cm-wide section, then subdivided into nine approximately 12.5-cm-long slabs using a finebladed hacksaw so as to minimize loss of information; cores were subsequently recleaned to eliminate contamination that may have occurred during slabbing. Core slabs were stored wrapped in clingfilm for transport to McMaster University where they were analyzed at the McMaster Core-Scanning facility using purpose-designed insulated boxes capable of keeping core material frozen for up to 2 hours (Gregory et al 2019b).…”

Section: Geochemical Analysismentioning

confidence: 99%

“…The freeze core was analyzed for near total geochemical determination using Itrax high-resolution core scanning x-ray fluorescence (Itrax-XRF). Itrax-XRF data were calibrated to near total concentrations of elements determined by ICP-MS following 4-acid digestion to provide quantitative scale to the measure of relative change provided by Itrax-XRF (Gregory et al 2019b). Spectral and wavelet analysis were used to evaluate cyclicities in geochemical concentrations in the sediment.…”

Section: Introductionmentioning

confidence: 99%

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Understanding the impact of millennial to sub-decadal climate and limnological change on the stability of As in lacustrine sediments

Gregory¹

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Metal(loid)s are expected to respond to 21st century warming as their stability in lacustrine systems is indirectly influenced by regional temperature and precipitation. In the Northwest Territories (NT), arsenic (As) is a metal(loid) of environmental concern due to elevated concentrations in bedrock and widespread mining-related contamination. To characterize the response of As to long-and short-term climate variability, we developed techniques that enable high temporal resolution analyses of sediment freeze cores, and applied them to a sediment cores (CON01, CON02) recovered from Control Lake, NT. New equipment was designed to enable Itrax X-ray fluorescence (Itrax-XRF) analysis of discrete sediment samples (Chapter 2). This equipment was used to test calibration methods that convert semi-quantitative Itrax-XRF results to near-total geochemical concentrations (Chapter 3). We found that the multi-variate log-ratio calibration provided the best approximation of actual geochemical concentrations. Subsequently, equipment was designed to permit scanning of freeze-cores using Itrax-XRF (Chapter 4). To characterize millennial-scale shifts in sedimentary As concentration in response to climate change, Arcellinida and ICP-MS analysis were conducted on core CON01 that recorded 4000 yr of sedimentation (Chapter 5). Arsenic concentrations the in core were related to shifts in the proportion of organic matter and shifts in minerogenic content (Rb, K). Comparison to regional records suggests changes in temperature impacted autochtonous productivity, which is hypothesized to have influenced sedimentary As concentrations. To characterize the response of As to quasi-periodic climate oscillations, CON02 was analyzed using Itrax-XRF. Itrax-XRF data were calibrated to paired ICP-MS data, and geochemical proxies for particle size (log(Zr/Ti)), in-lake productivity (log(Ca/Ti)), and As preservation (log(As/Ti)) were examined for cyclities using spectral and wavelet analyses. Periods of 8-15, 30-60, 90-130, and 180-300 yr were observed in all proxies. These periods are temporally related to the North Atlantic Oscillation/El niño/Schwabe sunspot cycles, the Pacific Decadal Oscillation, the Gleissberg cycle, and the Suess cycle, respectively. Cross-wavelet analysis of the paleo-proxies vs. published total solar irradiance reconstructions demonstrate significant relationships, suggesting a solar influence on climate and lake sediment geochemistry in the NT. These results suggest that As sequestration is impacted by short-period climate perturbations. Gregory et al 2019 iii Acknowledgments First and foremost, thank you to my co-supervisors Dr. Jennifer Galloway and Dr. Timothy Patterson, whose passion for science and support helped make this dissertation a reality. Thank you for pushing me to publish and present. Thank you to Dr. Eduard Reinhardt. You took me on as an undergraduate student and put me on the path to academia. Without your guidance I would not be into science, coffee or baking as I much as I am today. Thank you to my colle...

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Suitability of calibrated X-ray fluorescence core scanning for environmental geochemical characterisation of heterogeneous sediment cores

Goldberg¹,

Hennekam

Wasch³

et al. 2021

Applied Geochemistry

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The iBox-FC: A new containment vessel for Itrax X-ray fluorescence core-scanning of freeze cores

Cited by 10 publications

References 15 publications

Quantitative micro‐X‐ray fluorescence scanning spectroscopy of wet sediment based on the X‐ray absorption and emission theories: Its application to freshwater lake sedimentary sequences

Quantitative micro‐X‐ray fluorescence scanning spectroscopy of wet sediment based on the X‐ray absorption and emission theories: Its application to freshwater lake sedimentary sequences

Understanding the impact of millennial to sub-decadal climate and limnological change on the stability of As in lacustrine sediments

Suitability of calibrated X-ray fluorescence core scanning for environmental geochemical characterisation of heterogeneous sediment cores

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