The Influence of Sample Drying Procedures on Mercury Concentrations Analyzed in Soils

Hojdová, Maria; Rohovec, Jan; Chrastný, Vladislav; Penížek, Vít; Navrátil, Tomáš

doi:10.1007/s00128-015-1521-9

Cited by 42 publications

(21 citation statements)

References 24 publications

(20 reference statements)

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“…Soil and vegetation samples were oven-dried at 65°C (Lindberg Blue M Premium 3055, Thermo Fisher Scientific, Waltham, Massachusetts, USA), a method that has been shown to not lead to loss of Hg from soils or vegetation (Hojdova et al, 2015;Yang et al, 2017). Samples were then hand ground using a ceramic mortar and pestle followed by sieving using a 2-mm diameter stainless steel sieve (FieldMaster, Science First, Florida, USA).…”

Section: Sample Preparation and Analytical Methodsmentioning

confidence: 99%

Mercury in Active‐Layer Tundra Soils of Alaska: Concentrations, Pools, Origins, and Spatial Distribution

Olson

Jiskra

Biester

et al. 2018

Global Biogeochemical Cycles

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Tundra soils serve as major sources of mercury (Hg) input to the Arctic Ocean via river runoff and coastal erosion; yet little information is available on tundra soil Hg concentrations, pool sizes, origins, and dynamics. We present a detailed investigation of Hg in the active layer (upper ~100 cm subject to seasonal thaw) of tundra soils across 11 sites in Alaska. Soil Hg concentrations in organic horizons (151 ± 7 μg/kg) were in the upper range of temperate soil organic horizons, and concentrations in mineral horizons (98 ± 6 μg/kg) were much higher than in temperate soils. Soil Hg concentrations declined from inland to coastal sites, in contrast to a hypothesized northward increase expected because of proximity to coastal atmospheric mercury depletion events. Principle component analyses and elemental ratios results show that exogenic sources dominated over geogenic sources—in A‐horizons (66 ± 4%) and mineral B‐horizons (51 ± 1%). 14C age‐dating suggested recent origins of Hg in surface soils but showed that mineral soils (more than 7,300 years old) must have accumulated atmospheric inputs across millennia leading to high soil concentrations and pools. We estimated a total Northern Hemisphere active‐layer tundra soil Hg pool of 184 Gg (range of 136 to 274 Gg), suggesting a globally important Hg storage pool. Tundra soils are subject to seasonal thaw and freeze dynamics, thereby providing large inputs to rivers, lakes, and the Arctic Ocean. Understanding processes that mobilize Hg from tundra soils will be critical to understanding future Arctic wildlife and human Hg exposures.

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Section: Sample Preparation and Analytical Methodsmentioning

confidence: 99%

Mercury in Active‐Layer Tundra Soils of Alaska: Concentrations, Pools, Origins, and Spatial Distribution

Olson

Jiskra

Biester

et al. 2018

Global Biogeochemical Cycles

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“…Total Hg concentrations for regolith subsamples were quantified using a Direct Mercury Analyzer‐80 (Milestone Inc.). Subsamples were oven‐dried to a constant weight at approximately ~70 °C, which has been shown to release up to 8% of the total Hg but typically releases <3% (Hojdová et al, ). For the Hg measurement, 100 ± 10 mg of finely ground and homogenized subsamples were weighed into steel boats and ashed at 650 °C, trapping Hg on gold amalgam.…”

Section: Methodsmentioning

confidence: 99%

Mercury Sourcing and Sequestration in Weathering Profiles at Six Critical Zone Observatories

Richardson

Aguirre

Buss

et al. 2018

Global Biogeochemical Cycles

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Mercury sequestration in regolith (soils + weathered bedrock) is an important ecosystem service of the critical zone. This has largely remained unexplored, due to the difficulty of sample collection and the assumption that Hg is predominantly sequestered within surface soils (here we define as 0–0.3 m). We measured Hg concentrations and inventories in weathering profiles at six Critical Zone Observatories (CZOs): Boulder Creek in the Front Range of Colorado, Calhoun in the South Carolina Piedmont, Eel River in coastal northern California, Luquillo in the tropical montane forest of Puerto Rico, Shale Hills of the valley and ridges of central Pennsylvania, and Southern Sierra in the Sierra Nevada range of California. Surface soils had higher Hg concentrations than the deepest regolith samples, except for Eel River, which had lower Hg concentrations in surface soils compared to regolith. Using Ti normalization, CZOs with <12% rock‐derived Hg (Boulder Creek, Calhoun, and Southern Sierra) had Hg peaks between 1.5 and 8.0 m in depth. At CZOs with >50% rock‐derived Hg, Eel River Hg concentrations and pools were greatest at >4.0 m in the weathering profile, while Luquillo and Shale Hills had peaks at the surface that diminished within 1.0 m of the surface. Hg and total organic C were only significantly correlated in regolith at Luquillo and Shale Hills CZOs, suggesting that Hg sorption to organic matter may be less dominant than clays or Fe(II) sulfides in deeper regolith. Our results demonstrate the importance of Hg sequestration in deep regolith, below typical soil sampling depths.

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“…In the case of volatile elements their loss is a common occurrence. Therefore before analysis of the above mentioned elements as well as Hg, a subject of numerous studies of mushrooms, the selection of a suitable drying method or the use of a relatively low temperature is necessary (Hojdová et al 2015). It is worth noting that a higher drying temperature reduces the time of this stage of sample preparation, although it may be associated with the loss not only of volatile elements but also of heavy metals such as Pb or Zn (Zhang et al 2001).…”

Section: Element Contentsmentioning

confidence: 99%

The effect of drying temperature on bioactive compounds and antioxidant activity of Leccinum scabrum (Bull.) Gray and Hericium erinaceus (Bull.) Pers.

et al. 2019

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In the study the effect of drying temperature on phenolic and organic acid content, total phenolic content, ergosterol content, antioxidant activity and content of 40 elements in fruiting bodies of Leccinum scabrum and Hericium erinaceus was estimated. The analysis was performed for fresh fruiting bodies and those dried at 20, 40 and 70°C. Drying resulted in changes in the profile of phenolic and organic acids. Drying generally resulted in losses of the content of total phenolics, ergosterol and antioxidant activity in both species. However, a reduction and an increase of phenolic acids and organic acids were observed. The greatest reduction of the compounds was generally observed at 70°C. The greatest losses concerned organic acids (some single components and total) (even more than 90% of some compounds). The inhibition of free radicals decreased in the following order: fresh samples [ air-dried samples [ samples dried at 40°C [ samples dried at 70°C. The drying temperature affected only selected element contents in fruiting bodies.

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The Influence of Sample Drying Procedures on Mercury Concentrations Analyzed in Soils

Cited by 42 publications

References 24 publications

Mercury in Active‐Layer Tundra Soils of Alaska: Concentrations, Pools, Origins, and Spatial Distribution

Mercury in Active‐Layer Tundra Soils of Alaska: Concentrations, Pools, Origins, and Spatial Distribution

Mercury Sourcing and Sequestration in Weathering Profiles at Six Critical Zone Observatories

The effect of drying temperature on bioactive compounds and antioxidant activity of Leccinum scabrum (Bull.) Gray and Hericium erinaceus (Bull.) Pers.

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