Geochemistry of Holocene and late Pleistocene soils in the Rouge River and Scarborough Bluffs areas, South-Central Ontario, Canada

Mahaney, William C.; Hancock, R. G. V.

doi:10.1007/bf02060549

Cited by 7 publications

(2 citation statements)

References 5 publications

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“…Paleosol research has studied profiles in landscapes that are not managed (i.e., natural or seminatural) and that are solely dependent on atmospheric inputs for their pedogenises, enabling Anthropocene disturbance to be identified. − Mahaney and Hancock found that paleosol surface horizons situated in the remote northwest of China were contaminated by aeolian transport, with that contamination derived from coal emissions carried from the east on monsoonal winds. Soils in the surface A and B horizons ranged from 14.5 to 21 mg/kg, with the C horizon being considerably lower, 4.2–10.8 mg/kg.…”

Section: Sources and Trends In Atmospheric Arsenic And Subsequent Dep...mentioning

confidence: 99%

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The Pedosphere as a Sink, Source, and Record of Anthropogenic and Natural Arsenic Atmospheric Deposition

Meharg¹,

Meharg²

2021

Environ. Sci. Technol.

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The Anthropocene has led to global-scale contamination of the biosphere through diffuse atmospheric dispersal of arsenic. This review considers the sources arsenic to soils and its subsequent fate, identifying key knowledge gaps. There is a particular focus on soil classification and stratigraphy, as this is central to the topic under consideration. For Europe and North America, peat core chrono-sequences record massive enhancement of arsenic depositional flux from the onset of the Industrial Revolution to the late 20th century, while modern mitigation efforts have led to a sharp decline in emissions. Recent arsenic wet and dry depositional flux measurements and modern ice core records suggest that it is South America and East Asia that are now primary global-scale polluters. Natural sources of arsenic to the atmosphere are primarily from volcanic emissions, aeolian soil dust entrainment, and microbial biomethylation. However, quantifying these natural inputs to the atmosphere, and subsequent redeposition to soils, is only starting to become better defined. The pedosphere acts as both a sink and source of deposited arsenic. Soil is highly heterogeneous in the natural arsenic already present, in the chemical and biological regulation of its mobility within soil horizons, and in interaction with climatic and geomorphological settings. Mineral soils tend to be an arsenic sink, while organic soils act as both a sink and a source. It is identified here that peatlands hold a considerable amount of Anthropocene released arsenic, and that this store can be potentially remobilized under climate change scenarios. Also, increased ambient temperature seems to cause enhanced arsine release from soils, and potentially also from the oceans, leading to enhanced rates of arsenic biogeochemical cycling through the atmosphere. With respect to agriculture, rice cultivation was identified as a particular concern in Southeast Asia due to the current high arsenic deposition rates to soil, the efficiency of arsenic assimilation by rice grain, and grain yield reduction through toxicity.

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Section: Sources and Trends In Atmospheric Arsenic And Subsequent Dep...mentioning

confidence: 99%

“…85 There was also no evidence of aeolian contamination in a Canadian paleosol. 92 It appears that paleosols can be sensitive indicators of whether remote regions are subject to long-distance contamination or not, providing valuable evidence for diffuse Anthropocene arsenic contamination.…”

Section: ■ Sources and Trends In Atmospheric Arsenic And Subsequent D...mentioning

confidence: 99%

The Pedosphere as a Sink, Source, and Record of Anthropogenic and Natural Arsenic Atmospheric Deposition

Meharg¹,

Meharg²

2021

Environ. Sci. Technol.

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Geochemistry of Spodosols formed in holocene till, Norra Storfjället Massif, northern Sweden

Earl-Goulet

Mahaney

Hancock

et al. 1997

J Radioanal Nucl Chem

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Investigation of the vertical distribution of major and trace elements in Matita Lake (Danube Delta) sediments by activation analysis

Dinescu¹,

Duliu

Badea

et al. 1998

J Radioanal Nucl Chem

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The vertical profiles of two major elements (Na and Ca) and 24 trace elements (Rb, Cs, Sr, Ba, Sc, La, Ce, Sm, Eu, Tb, Yb, Lu, Th, U, Hf, Nb, Ta, Cr, Fe, Co, Zn, As, Sb and Br) have been investigated by neutron activation analysis in a 2.5 m core collected from the Danube Delta, Matita Lake. The data have been correlated with the concentrations of five major minerals (calcite, dolomite, feldspar, clay and quartz) as determined by X-ray diffraction. This study revealed the presence of As, Sb and Br as pollutant microelements.

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Geochemistry of Holocene and late Pleistocene soils in the Rouge River and Scarborough Bluffs areas, South-Central Ontario, Canada

Cited by 7 publications

References 5 publications

The Pedosphere as a Sink, Source, and Record of Anthropogenic and Natural Arsenic Atmospheric Deposition

The Pedosphere as a Sink, Source, and Record of Anthropogenic and Natural Arsenic Atmospheric Deposition

Geochemistry of Spodosols formed in holocene till, Norra Storfjället Massif, northern Sweden

Investigation of the vertical distribution of major and trace elements in Matita Lake (Danube Delta) sediments by activation analysis

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