An Easy Method to Measure Total Particulate Hg in Water Without Chemical Digestion

Sarica, José; Amyot, Marc; Hare, Landis

doi:10.1023/b:wate.0000009892.64786.48

Cited by 8 publications

(6 citation statements)

References 6 publications

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“…Results presented in this paper were therefore corrected for this adsorption when polycarbonate filters were used. This method was compared to that of Sarica et al (2004) which uses a direct mercury analyser and determines Hg content by pyrolysis of the filter; no statistical difference was found using either the subtraction method, presented here, or the pyrolysis method (Wilcoxon, p = 0.334). For bacterial counts, Falcon tubes were filled with snow, thawed at 4°C and preserved with glutaraldehyde to a final concentration of 2%.…”

Section: Partitioning Experimentsmentioning

confidence: 93%

Mercury distribution, partitioning and speciation in coastal vs. inland High Arctic snow

Poulain

Garcia

Amyot

et al. 2007

Geochimica et Cosmochimica Acta

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Atmospheric mercury deposition on snow at springtime has been reported in polar regions, potentially posing a threat to coastal and inland ecosystems receiving meltwaters. However, the post-depositional fate of Hg in snow is not well known, and no data are available on Hg partitioning in polar snow. During snowmelt, we conducted a survey of Hg concentrations, partitioning and speciation in surface snow and at depth, over sea ice and over land along a 100 km transect across Cornwallis Island, NU, Canada. Total Hg concentrations [THg] in surface snow were low (less than 20 pmol L À1 ) and were significantly higher in marine vs. inland environments. Particulate Hg in surface snow represented up to 90% of total Hg over sea ice and up to 59% over land. At depth, [THg] at the snow/sea ice interface (up to 300 pmol L À1 ) were two orders of magnitude higher than at the snow/lake ice interface (ca. 2.5 pmol L À1 ). Integrated snow columns, sampled over sea-ice and over land, showed that particulate Hg was mostly bound to particles ranging from 0.45 to 2.7 lm. Moreover, melting snowpacks over sea ice and over lake ice contribute to increase [THg] at the water/ice interfaces. This study indicates that, at the onset of snowmelt, most of the Hg in snow is in particulate form, particularly over sea ice. Low Hg levels in surface snow suggest that Hg deposited through early spring deposition events is partly lost to the atmosphere from the snowpack before snowmelt. The sea ice/snow interface may constitute a site for Hg accumulation, however. Further understanding of the cycling of mercury at the sea ice/ snow and sea ice/seawater interfaces is thus warranted to fully understand how mercury enters the arctic food webs.

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Section: Partitioning Experimentsmentioning

confidence: 93%

Mercury distribution, partitioning and speciation in coastal vs. inland High Arctic snow

Poulain

Garcia

Amyot

et al. 2007

Geochimica et Cosmochimica Acta

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“…Because snow was melted prior to the filtration and analysis, this method does not measure soluble aerosols that could be present in solid snow. This method was compared to that of Sarica et al (2004) which uses a direct mercury analyser and determines Hg content by pyrolysis of the filter; no statistical difference was found using either the subtraction or the pyrolysis methods (Wilcoxon, p = 0.334).…”

Section: Particulate Hg Distributionmentioning

confidence: 98%

Influence of temperate mixed and deciduous tree covers on Hg concentrations and photoredox transformations in snow

Poulain

Roy

Amyot

2007

Geochimica et Cosmochimica Acta

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“…6). Because sediments can move downstream during spates (Sarica et al 2004), it would be difficult to use sediments to monitor Hg inputs from salmon carcasses. This high variability may be caused by salmon, which can disturb sediments during spawning.…”

Section: Fig 4 Mean Concentrations (ϯSd) Of (mentioning

confidence: 99%

Salmon‐derived mercury and nutrients in a Lake Ontario spawning stream

Sarica¹,

Amyot²,

Hare³

et al. 2004

Limnology & Oceanography

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We tested the hypothesis that concentrations of mercury species (Hg) and nutrients (NH , NO , P, and dissolved ϩ Ϫ 4 3 organic carbon) in abiotic and biotic components would be altered by the decomposition of salmon carcasses in streams. We investigated a tributary stream of Lake Ontario receiving spawning runs of Chinook salmon (Oncorhyncus tshawytscha) for 2 yr with contrasting bear activity. Stations with high carcass densities had significantly higher levels of aqueous total Hg, methylmercury (MeHg), particulate Hg, and nutrients than did stations with lower carcass densities. Hg levels in aquatic and terrestrial invertebrates feeding on carcasses increased by up to 25-fold. In 2001, a bear removed most carcasses at the downstream station, and aqueous Hg and nutrient concentrations were significantly lower than during the preceding year, when no bear was active at that station. A preliminary budget for this stream shows that (1) salmon carcasses can be an important source of Hg and nutrients to aquatic and terrestrial food webs, and (2) terrestrial invertebrates and vertebrates can be important water-to-land vectors of Hg.

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An Easy Method to Measure Total Particulate Hg in Water Without Chemical Digestion

Cited by 8 publications

References 6 publications

Mercury distribution, partitioning and speciation in coastal vs. inland High Arctic snow

Mercury distribution, partitioning and speciation in coastal vs. inland High Arctic snow

Influence of temperate mixed and deciduous tree covers on Hg concentrations and photoredox transformations in snow

Salmon‐derived mercury and nutrients in a Lake Ontario spawning stream

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