Spatial and temporal variations of mercury (Hg) isotope ratios in ice cores across the Canadian Arctic

Select ice core samples representing a north-south gradient across the predominately Eastern Canadian Arctic were analyzed for total Hg, methyl Hg and Hg isotope ratios. The ice cores originated from Penny Ice Cap (Baffin Island), Prince of Wales Icefield (Central Ellesmere Island), Agassiz Ice Cap (northern Ellesmere Island), Devon Ice Cap (Devon Island), and Mt Logan (Yukon Territory). The selected time intervals for the ice core samples were: modern precipitation (last 50 - 100 years), late Holocene precipitation (150 - 3000 years ago), Mid-Holocene precipitation (3000 - 6000 years ago), and early Holocene (6000 - 11,500 years ago). Prior to analysis, ice cores were cleaned to remove the outer layer that could have been contaminated with Hg during drilling, storage or handling of the cores. Total Hg was determined by cold vapor-atomic fluorescence spectroscopy on a Tekran 2600 system, following EPA method 1631. For methyl Hg analyses, melted ice samples were pre-concentrated and then analyzed by capillary gas chromatography coupled with atomic fluorescence spectrometry using a PS Analytical mercury system model PSA 10.723. Ratios for five Hg isotopes (198Hg, 199Hg, 200Hg, 201Hg, and 202Hg) were determined on a Thermo Fisher multicollector inductively coupled plasma mass spectrometer (MC-ICP/MS). Standard bracketing technique with 2 ng/mL Hg solution (in 0.12 M HCl, NIST 3133) was applied to calculate Hg isotope deviations. Hg concentrations in samples and bracketing standards were matched to within 5%.

Identifier
Source https://www.polardata.ca/pdcsearch/PDCSearchDOI.jsp?doi_id=12432
Metadata Access http://www.polardata.ca/oai/provider?verb=GetRecord&metadataPrefix=fgdc&identifier=12432_fgdc
Provenance
Creator Kruemmel, Eva; Hintelmann, Holger; Poulain, Alexandre; Strok, Marko; Yumvihoze, Emmanuel; Zdanowicz, Christian
Publisher Canadian Cryospheric Information Network
Contributor Polar Data Catalogue
Publication Year 2015
Rights Research programs, CCIN, or ArcticNet take no liability for the use or transmission of this data
OpenAccess true
Contact ekruemmel(at)inuitcircumpolar.com; pdc(at)uwaterloo.ca
Representation
Language English
Format Computer file
Discipline Environmental Research
Spatial Coverage (-140.500W, 60.600S, -65.770E, 80.700N)
Temporal Coverage Begin 2012-04-01T00:00:00Z
Temporal Coverage End 2013-03-31T00:00:00Z