Development of pre-concentration procedure for the determination of Hg isotope ratios in seawater samples

Štrok, Marko; Hintelmann, Holger; Dimock, Brian

doi:10.1016/j.aca.2014.09.005

Cited by 48 publications

(29 citation statements)

References 17 publications

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“…[], while for the remainder of the firn and ice cores, a variant of the same protocol, optimized by Štrok et al . [] for large‐volume samples, was used. The final volumes of concentrated Hg solution obtained after elution were on the order of 3–5 mL, corresponding to preconcentration factors of up to 400.…”

Section: Methodsmentioning

confidence: 99%

“…In their study, Štrok et al . [] estimated the recovery of Hg by the preconcentration protocol to be 94–100% for sample volumes up to 10 L, without any significant isotopic fractionation of Hg being induced. In our study, recoveries were estimated by comparing the total initial mass

((), m_{T H g}^{i})

of THg measured in the separate ice core segments with that in the combined sample obtained after preconcentration

((), m_{T H g}^{f})

.…”

Section: Methodsmentioning

confidence: 99%

“…In this study, we determined the concentration and stable isotope composition of Hg in glacier firn and ice cores in order to investigate possible sources and trends of atmospheric Hg deposition in the Arctic environment over past decades, centuries, and millennia. We took advantage of the recent development of preconcentration techniques for the determination of Hg isotope ratios in water samples [ Chen et al ., ; Štrok et al ., ] and applied these to archived glacier firn and ice cores collected at multiple sites across the Canadian Arctic Archipelago. These samples range in age from recent decades to more than ten millennia.…”

Section: Introductionmentioning

confidence: 99%

“…The isotopic signatures of Hg in different media (soil, precipitation, air, and organic tissues) that are inherited during the cycling of Hg can therefore be used as tracers to identify the source(s) and processes involved and also help constrain the development of global models of Hg cycling in the environment [e.g., Yin et al, 2010;Sonke, 2011].In this study, we determined the concentration and stable isotope composition of Hg in glacier firn and ice cores in order to investigate possible sources and trends of atmospheric Hg deposition in the Arctic environment over past decades, centuries, and millennia. We took advantage of the recent development of preconcentration techniques for the determination of Hg isotope ratios in water samples [Chen et al, 2010;Štrok et al, 2014] and applied these to archived glacier firn and ice cores collected at multiple sites across the Canadian Arctic ZDANOWICZ ET AL.…”

mentioning

confidence: 99%

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Historical variations of mercury stable isotope ratios in Arctic glacier firn and ice cores

Zdanowicz

Krümmel

Poulain

et al. 2016

Global Biogeochemical Cycles

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The concentration and isotopic composition of mercury (Hg) were determined in glacier core samples from Canadian Arctic ice caps dating from preindustrial to recent time (early 21st century). Mean Hg levels increased from ≤ 0.2 ng L−1 in preindustrial time to ~0.8–1.2 ng L−1 in the modern industrial era (last ~200 years). Hg accumulated on Arctic ice caps has Δ199Hg and Δ201Hg that are higher (~ −1 to 2.9‰) than previously reported for Arctic snow impacted by atmospheric Hg depletion events (mostly < −1‰), suggesting that these events contribute little to Hg accumulation on ice caps. The range of δ202Hg, Δ199Hg, and Δ201Hg in glacier cores overlaps with that of Arctic Hg0(g) and of seawater in Baffin Bay and also with that of midlatitude precipitation and industrial Hg sources, including coal and Hg ores. A core from Agassiz ice cap (80.7°N) shows a ~ +1‰ shift in δ202Hg over the nineteenth to twentieth centuries that could reflect changes in the isotopic composition of the atmospheric Hg pool in the High Arctic in response to growing industrial emissions at lower latitudes. This study is the first ever to report on historical variations of Hg stable isotope ratios in Arctic ice cores. Results could help constrain future modeling efforts of the global Hg biogeochemical cycle and the atmosphere's response to changing Hg emissions, past and future.

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Section: Methodsmentioning

confidence: 99%

((), m_{T H g}^{i})

of THg measured in the separate ice core segments with that in the combined sample obtained after preconcentration

((), m_{T H g}^{f})

.…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

See 2 more Smart Citations

Historical variations of mercury stable isotope ratios in Arctic glacier firn and ice cores

Zdanowicz

Krümmel

Poulain

et al. 2016

Global Biogeochemical Cycles

View full text Add to dashboard Cite

show abstract

“…In a procedure for the preconcentration of mercury adapted for measurement of Hg isotope ratios in seawater, 193 ltered seawater was acidied with 10 mL of concentrated HNO 3 per L of sample. The sample was then purged with N 2 overnight to remove I 2 , acidied to a concentration of 0.1 M with HCl and treated with BrCl to release the organically-bound Hg.…”

Section: Instrumental Analysismentioning

confidence: 99%