Arcellinida (Testate Lobose Amoebae) as Sensitive Bioindicators of Arsenic Contamination in Lakes

Patterson, R. Timothy; Nasser, Nawaf A.; Gregory, Braden R.B.; Gavel, Melody J.; Menard, Etienne; Galloway, Jennifer M.; Roe, Helen

doi:10.1007/978-3-030-01683-8_15

Cited by 6 publications

(12 citation statements)

References 3 publications

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“…Previous studies have found that there is a strong relationship between lake productivity and metal(loid) mobility between modern lake sediments and the overlaying waters (Galloway et al, 2018;Palmer et al, 2019). Similar relationships between productivity, temperature variations, and sequestration of redox-sensitive elements were also found in paleoclimate records (Gregory et al, 2019;Miller et al, 2020).…”

supporting

confidence: 73%

“…In contrast to ICP-MS analysis, which delivers quantitative results, ITRAX-XRF analysis while offering very highresolution analysis, provides relative semi-quantitative values, resulting in a compromise in geochemical accuracy and precision (Tjallingii et al, 2007). Broadly speaking, cost-effective ITRAX-XRF analysis is an excellent method for pinpointing the timing of impacts at a high resolution, while ICP-MS is most effective for validating absolute geochemical values at specific core horizons (Guard et al, 2007;Miller et al, 2015;Gregory et al, 2019). Significant progress has been achieved in aligning ITRAX-XRF measurements with ICP-MS, as demonstrated by the calibration scheme developed by Gregory et al, (2019).…”

Section: Sediment Geochemistrymentioning

confidence: 99%

“…Broadly speaking, cost-effective ITRAX-XRF analysis is an excellent method for pinpointing the timing of impacts at a high resolution, while ICP-MS is most effective for validating absolute geochemical values at specific core horizons (Guard et al, 2007;Miller et al, 2015;Gregory et al, 2019). Significant progress has been achieved in aligning ITRAX-XRF measurements with ICP-MS, as demonstrated by the calibration scheme developed by Gregory et al, (2019).…”

Section: Sediment Geochemistrymentioning

confidence: 99%

“…Non-destructive ITRAX-XRF analysis (Croudace et al, 2016) was carried out on 585 subsamples at McMaster University using subsamples from F1, following the SSRV protocol of Gregory et al (2017). Due to the limited sample materials available from the mm-resolution subsamples, certain intervals (especially near the SWI and cracks) did not have enough samples to fill the SSRV and thus were combine (Gregory et al, 2019). The SSRV ITRAX-XRF analysis was carried out using a molybdenum (Mo) tube set to 25 kV and 22 mA for 25 s per interval.…”

Section: X-ray Fluorescence Spectrometrymentioning

confidence: 99%

“…In the vicinity of Yellowknife, Northwest Territories, large-scale mining operations have left a legacy of arsenic (As) and other metal(loids) contaminations in the surrounding environment (Houben et al, 2016;Nasser et al, 2016Nasser et al, , 2020Palmer et al, 2019;Patterson et al, 2019).…”

mentioning

confidence: 99%

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Late Holocene Paleoclimate Reconstruction in Debauchery Bay, Northwest Territories Canada using Particle Size Analysis and Geochemical Proxies

Shi

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Climate variability significantly influences lacustrine systems, impacting physical, chemical, and biological components. This is particularly true of lakes situated in high-latitude northern environments, where the impact of a changing climate is particularly pronounced. Of additional concern in the Yellowknife, Northwest Territories area is the widespread contamination by arsenic associated with ore processing at the former Giant Mine, located just north of the community. In this study, high-resolution ITRAX X-ray Fluorescence (XRF) and particle size data obtained from a freeze core recovered from Debauchery Bay in Walsh Lake were analyzed to infer and quantify late Holocene changes within this lake system and their implications for the mobility and fate of arsenic in surface water environments. Through examination of proxy data preserved in an ~ 1000 -year freeze core, results suggest that arsenic sequestration in sediments has been linked with the presence of Fe(oxy) hydroxides in oxygenated shallow sedimentary environments. Climate variability associated with the Medieval Climate Anomaly and subsequent cooling associated with the Little Ice Age impacted sediment geochemistry, demonstrating climate controls on mobility and sequestration of trace metals in high-latitude lacustrine environments. In addition, significant periodicities of 5-8,11-14, 60, 100 -113, and 202 yr periods were observed in spectral and wavelet time series analysis results based on selected XRF elemental and robust End Member Mixing Analysis records. These frequencies are interpreted as corresponding to the combined impact of the North Atlantic Oscillation and Schwabe sunspot cycles, 30 -60 -yr Pacific Decadal Oscillation, 90-yr Gleissberg cycle and 205-yr Suess cycle.iii Acknowledgements I would like to acknowledge and give thanks to my supervisors, Prof Tim Patterson and Dr. Jennifer Galloway, for their guidance and feedback throughout all stages of the writing of my project. I would also like to acknowledge the great contribution from Dr. Carling Walsh, who made the graphs for End Member Mixing Analysis and time-series analysis used in this project.Thank you to Dr. Nawaf Nasser and Dr. Braden Gregory for their patience and expertise over the past two years. I would also like to acknowledge that the freeze cores used in this study were collected by previous Patterson lab members in 2019: Braden Gregory, Andrew Macumber, and Ryan Backyinski. Finally, thanks to my amazing friends and colleagues (Anne, Budyanee, Carling, Carol and Maxim) and family (Jun Shi and ChunYan Zhang) who supported me through my Masters.

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supporting

confidence: 73%