Heavy Metals in Cultivated Soils and in Cereal Crops in Alberta

Dudas, M. J.; Pawluk, S.

doi:10.4141/cjss77-037

Cited by 38 publications

(20 citation statements)

References 19 publications

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“…In the same area, abandoned agricultural fields had very low SOM and less Hg (1.3 mg m −2 ) than immediately adjacent forests (2.4 mg m −2 ) (Grigal et al, 1994). In cultivated soils in Alberta, poorly drained soils, higher in SOM than well‐drained soils, tended to have higher Hg concentrations (Dudas and Pawluk, 1977). Within poorly drained soils, Hg and SOM concentrations were positively related (Dudas and Pawluk, 1977).…”

Section: Soilsmentioning

confidence: 99%

Mercury Sequestration in Forests and Peatlands

2003

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Nearly all Hg in vegetation is derived directly from the atmosphere. Mass of Hg in forest vegetation (roughly 0.1 mg m(-2)) is about an order of magnitude smaller than that in the forest floor (1 mg m(-2)) and two orders of magnitude smaller than that in the mineral soil (10 mg m(-2)). Mass of Hg in peat (20 mg m(-2)) is greater than the sum of that in mineral soil and the forest floor; wetlands usually sequester more Hg than associated uplands. The strong relationship of Hg to organic matter, associated with binding by reduced S groups, is fundamental to understanding Hg distribution and behavior in terrestrial systems. The stoichiometry of the Hg-C relationship varies; Hg-S relationships, though less variable, are not constant. Because of the Hg-organic matter link, landscape conditions that lead to differential soil organic matter accumulation are likely to lead to differential Hg accumulation. The ratio of methylmercury (MeHg) to total Hg is generally low in both vegetation (near 1.5%) and soil (<1%), but areas of poorly drained soils and wetlands are sites of MeHg production. The annual emission of anthropic Hg from the 48 contiguous states of the USA (144 Mg) is two orders of magnitude less than the pool of Hg in forests of those states (30,300 Mg). Peatlands, less than 2% of total land area, sequester more than 20 times annual emissions (2930 Mg). If global climate change affects C storage it will indirectly affect Hg storage, having a major effect on the balance between emissions and sequestration and on the global Hg cycle.

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Section: Soilsmentioning

confidence: 99%

Mercury Sequestration in Forests and Peatlands

2003

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“…In addition to those mentioned earlier, there are crystalline forms, but these were not determined in this study. Both pedogenesis and nature of parent material influenced the levels of these metals in surface soil horizons (Dudas and Pawlak, 1977). One of the most important factors that determine the biological availability of a metallic element is its binding to soil constituents (Brennan, 1992).…”

Section: Soil Chemistry In the Two Catchmentsmentioning

confidence: 99%

Distribution of Al-, Fe- and Mn-pools and their correlation in soils from two acid deposition small catchments in Hunan, China

et al. 2006

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Distribution of Al-, Fe-and Mn-pools was investigated in five forest soil profiles (consisting of four horizons) in each of two Hunan catchments (BLT and LKS) where acid deposition has been considered critical. Al-and Fe-pools were higher in BLT than those in LKS, but Mn-pools much lower in BLT. Mn-pools vary from topsoils to bottom soils, but there are different trends for different Mn speciation. Al-and Fe-pools, except amorphous Fe ox , were positively correlated to contents of soil organic matter (OM) showed by the loss on ignition in the two catchments. Accumulation of Al-and Fe-pools may occur in the area where soil organic matter was enriched (e.g. in top soil and rhizosphere soil). However, no direct correlation is observed between Mn and OM. Acidic atmospheric deposition may affect transforming among speciations of Al-, Fe-and Mn-pools and leaching of soil Al, Fe and Mn through formation of soluble organometal dissolved Al which was potentially toxic, increased. There were significant correlations between Al-pools complexes or change of oxidation-reduction conditions. Mn ex (exchangeable Mn) and Mn ox (amorphous and organic Mn) were highly linearly correlation with soil pH values at LKS but at BLT. Under acid deposition, the availability of the nutrient Fe increased with the amount of dissolved Al, which was potentially toxic, in the two catchments. There are no significant correlations between Al ex (exchangeable Al) and Mn ex , Fe ex (exchangeable Fe) and Mn ex in this work, indicating potentially toxic Mn increase seldom accompanying with Al increase in the two catchments.

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“…High concentrations of REEs were reported by Borrego et al (2004) in Tinto and Odiel estuaries in Spain, due to the waste from the fertilizer industries. Dudas and Pawluk (1977) found high concentrations of heavy metals and REEs in cultivated soils and in cereal crops of Alberts, Canada. Phosphogypsum, a by-product from the production of phosphate fertilizers, contains trace elements and rare earth elements.…”

Section: Introductionmentioning

confidence: 99%

Behaviour of REEs in a tropical estuary and adjacent continental shelf of southwest coast of India: Evidence from anomalies

2012

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The distribution and accumulation of the rare earth elements (REE) in the sediments of the Cochin Estuary and adjacent continental shelf were investigated. The rare earth elements like La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu and the heavy metals like Mg, V, Cr, Mn, Fe, Cu, Zn, U, Th were analysed by using standard analytical methods. The Post-Archean Australian Shale composition was used to normalise the rare earth elements. It was found that the sediments were more enriched with the lighter rare earth elements than the heavier ones. The positive correlation between the concentrations of REE, Fe and Mn could explain the precipitation of oxyhydroxides in the study area. The factor analysis and correlation analysis suggest common sources of origin for the REEs. From the Ce-anomalies calculated, it was found that an oxic environment predominates in all stations except the station No. 2. The Eu-anomaly gave an idea that the origin of REEs may be from the feldspar. The parameters like total organic carbon, U/Th ratio, authigenic U, Cu/Zn, V/Cr ratios revealed the oxic environment and thus the depositional behaviour of REEs in the region.

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Heavy Metals in Cultivated Soils and in Cereal Crops in Alberta

Cited by 38 publications

References 19 publications

Mercury Sequestration in Forests and Peatlands

Mercury Sequestration in Forests and Peatlands

Distribution of Al-, Fe- and Mn-pools and their correlation in soils from two acid deposition small catchments in Hunan, China

Behaviour of REEs in a tropical estuary and adjacent continental shelf of southwest coast of India: Evidence from anomalies

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