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TitleClassification of mercury - labile organic matter relationships in lake sediments
AuthorSanei, H S; Outridge, P M O; Stern, G A S; Macdonald, R W M
SourceChemical Geology vol. 373, 2014 p. 87-92, https://doi.org/10.1016/j.chemgeo.2014.02.029
Year2014
Alt SeriesEarth Sciences Sector, Contribution Series 20140327
PublisherElsevier
Documentserial
Lang.English
Mediapaper; on-line; digital
File formatpdf
ProvinceCanada; British Columbia; Alberta; Saskatchewan; Manitoba; Ontario; Quebec; New Brunswick; Nova Scotia; Prince Edward Island; Newfoundland and Labrador; Northwest Territories; Yukon; Nunavut
NTS1; 2; 3; 10; 11; 12; 13; 14; 15; 16; 20; 21; 22; 23; 24; 25; 26; 27; 28; 29; 30; 31; 32; 33; 34; 35; 36; 37; 38; 39; 40; 41; 42; 43; 44; 45; 46; 47; 48; 49; 52; 53; 54; 55; 56; 57; 58; 59; 62; 63; 64; 65; 66; 67; 68; 69; 72; 73; 74; 75; 76; 77; 78; 79; 82; 83; 84; 85; 86; 87; 88; 89; 92; 93; 94; 95; 96; 97; 98; 99; 102; 103; 104; 105; 106; 107; 114O; 114P; 115; 116; 117; 120; 340; 560
Lat/Long WENS-141.0000 -50.0000 90.0000 41.7500
Subjectssediment geochemistry; basins; lake sediments; lake water; heavy metals geochemistry; heavy metals contamination; organic deposits; organic residues; mercury; mineralization; organic carbon; sulphur; groundwater; surface waters
Illustrationslocation maps; tables; graphs; geochemical plots
Programenvironmental impacts and adaptation in the northern environment, Environmental Geoscience
AbstractThis paper synthesizes the sediment geochemistry data for 20 sediment cores from 18 lakes from various regions of Canada to describe general relationships between mercury (Hg) and the relative amount of labile organic matter (OM) as a proportion of total organic carbon. These relationships form the basis for proposing a general classification scheme of the capacity of a lake system to bind Hg to OM, which provides a first order screening of lakes to quickly assess them before further detailed analytical methods are employed. Mercury is known to have a strong affinity to OM before entering the lakes (binding with soil OM in the watershed) and also within the lakes (scavenging by autochthonous OM). Association of Hg with particulate OM, irrespective of the source, effectively captures available Hg(II) and ultimately sequesters it in bottom sediments. Relationships between total Hg concentration and the relative amount of labile OM in the sediments of a given system reveal important geochemical information; for example, the overall capacity of the system to effectively scavenge and fix available Hg, or its vulnerability to be overwhelmed by excess inputs of Hg in organic-poor or Hg contaminated systems.
Summary(Plain Language Summary, not published)
This paper provides simple classification of various lakes sediments archives based on their affinity between organic matter and mercury. This classification provides a first order screening of lakes for quick assessment of their depositional environment and their capacity to bind mercury to OM. The classification scheme is perhaps analogous to the ¿van krevelen diagram¿ in organic geochemistry, which provides useful information on the sedimentary system before subsequent detailed works are conducted.
GEOSCAN ID295583