Fate of some heavy metals in soils: a review

Orhue, Ehi Robert; Frank, Uzu

doi:10.31018/jans.v3i1.171

Cited by 15 publications

(8 citation statements)

References 56 publications

(39 reference statements)

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“…a). This is not surprising because, as expected, metal solubility decreases as pH increases and high values of clay and CEC indicate a high potential of soils to retain PTEs ( Orhue and Uzu , ). Carbonate content seemed not to be correlated with the PTEs amounts extracted by NH 4 NO 3 , except for Zn (negative correlation), whereas organic carbon content seemed loosely positively correlated, again with the exception of Zn (no correlation).…”

Section: Resultssupporting

confidence: 85%

Soil versus plant as indicators of agroecosystem pollution by potentially toxic elements

Agrelli

Adamo

Cirillo

et al. 2017

J. Plant Nutr. Soil Sci.

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The major route of potentially toxic elements (PTEs) to humans is the intake through food. They enter the food chain principally by plants uptake from the soil and, to a less extent, through foliar deposition. The soil‐to‐plant transfer as part of the biogeochemical cycle of these elements is a complex and hardly predictable process. In this study, we investigated the capability of soils and plants to indicate PTEs inputs in an intermingled urban‐rural landscape of south Italy affected by legal and illegal waste disposal and dumping. For this aim, 172 agricultural soil and plant (edible part) samples were collected in pairs from 47 municipalities and analyzed for 12 PTEs (As, Be, Cd, Co, Cu, Cr, Ni, Pb, Se, Tl, V, Zn). Soil extractions with 1 M NH4NO3 and 0.05 M EDTA pH 7 were applied to assess PTEs bioavailability. Results were examined according to plant species and main soil chemical properties. For Pb and Cd, the soil‐to‐plant transfer factors (TF) and the corresponding soil benchmark concentrations were also investigated. Zinc, Cu, Cd, and Pb were the only PTEs of anthropic origin severely polluting from 10 to 16% of the soils, but only in a very few cases exceeded physiological or EU legal critical values in the edible part of the plants. An evaluation of human risk due to the ingestion of these elements was tried; no risk for consumers for Zn, Cu, and Pb, while for Cd three values slightly exceeded the tolerable daily intake. Therefore, we conclude that crops cultivated in the studied area could represent only a moderate risk for human health. No correlation was found between soil and plant data, which likely highlights different pollution inputs. A large variability characterized the Pb and Cd TF, making it difficult to establish a unique benchmark concentration for the studied agricultural soils.

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Section: Resultssupporting

confidence: 85%

Soil versus plant as indicators of agroecosystem pollution by potentially toxic elements

Agrelli

Adamo

Cirillo

et al. 2017

J. Plant Nutr. Soil Sci.

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“…CEC is also known to affect PTM concertation in soil. High CEC has been reported to impact retention of PTMs [52][53][54]. For soils of the Bumpus Cove, CEC was a significant covariate in the cokriging model, however, the result indicated a negative relation between Zn and CEC [22], in contrast to the significant positive correlation between Zn and CEC found at a different site by Navas and Machin [52].…”

Section: Zincmentioning

confidence: 78%

Evaluating Spatial Regression-Informed Cokriging of Metals in Soils near Abandoned Mines in Bumpus Cove, Tennessee, USA

Magno¹,

Luffman

Nandi

2021

Geosciences

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Inorganic contaminants, including potentially toxic metals (PTMs), originating from un-reclaimed abandoned mine areas may accumulate in soils and present significant distress to environmental and public health. The ability to generate realistic spatial distribution models of such contamination is important for risk assessment and remedial planning of sites where this has occurred. This study evaluated the prediction accuracy of optimized ordinary kriging compared to spatial regression-informed cokriging for PTMs (Zn, Mn, Cu, Pb, and Cd) in soils near abandoned mines in Bumpus Cove, Tennessee, USA. Cokriging variables and neighborhood sizes were systematically selected from prior statistical analyses based on the association with PTM transport and soil physico-chemical properties (soil texture, moisture content, bulk density, pH, cation exchange capacity (CEC), and total organic carbon (TOC)). A log transform was applied to fit the frequency histograms to a normal distribution. Superior models were chosen based on six diagnostics (ME, RMS, MES, RMSS, ASE, and ASE-RMS), which produced mixed results. Cokriging models were preferred for Mn, Zn, Cu, and Cd, whereas ordinary kriging yielded better model results for Pb. This study determined that the preliminary process of developing spatial regression models, thus enabling the selection of contributing soil properties, can improve the interpolation accuracy of PTMs in abandoned mine sites.

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“…Soil texture refers to the relative proportions of sand, silt, and clay particles in the soil. Each soil texture type has distinct properties that influence heavy metal retention and release, directly impacting their bioavailability to plants [247,248]. Clay soils, characterized by their high proportion of fine clay particles, tend to have higher adsorption capacities for heavy metals.…”

Section: Soil Texture and Its Influence On Heavy Metal Availability I...mentioning

confidence: 99%

Analysis of Heavy Metal Impacts on Cereal Crop Growth and Development in Contaminated Soils

Vasilachi,

Stoleru,

Gavrilescu

2023

Agriculture

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The impact of heavy metal presence in soil on cereal crops is a growing concern, posing significant challenges to global food security and environmental sustainability. Cereal crops, vital sources of nutrition, face the risk of contamination with toxic heavy metals released into the environment through human activities. This paper explores key aspects requiring thorough investigation to foster innovation and understand intricate interactions between heavy metals and cereals. Visible symptoms and physiological changes resulting from heavy metal contamination, such as chlorosis and stunted growth, demand further research to devise targeted mitigation strategies and sustainable agricultural practices. Root barrier formation, mycorrhizal symbiosis, and metal-binding proteins emerge as critical defence mechanisms for combating heavy metal stress, offering opportunities for developing metal-tolerant cereal varieties. Research on metal bioavailability and food safety implications in cereal grains is vital to safeguard human health. This paper reveals that multidisciplinary collaboration and cutting-edge technologies are essential for promoting innovation beyond the state of the art in elucidating and mitigating the impacts of heavy metals on cereal crops. Genetic and breeding approaches show promise in developing metal-tolerant cereal varieties, while agronomic practices and soil amendments can reduce metal bioavailability and toxicity. Unravelling the complex mechanisms underlying heavy metal uptake and tolerance is essential for sustainable cereal agriculture and worldwide food sustainability. Embracing the challenges of heavy metal pollution through proactive research and collaboration can secure a resilient future for cereal crops amid evolving environmental conditions.

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Fate of some heavy metals in soils: a review

Cited by 15 publications

References 56 publications

Soil versus plant as indicators of agroecosystem pollution by potentially toxic elements

Soil versus plant as indicators of agroecosystem pollution by potentially toxic elements

Evaluating Spatial Regression-Informed Cokriging of Metals in Soils near Abandoned Mines in Bumpus Cove, Tennessee, USA

Analysis of Heavy Metal Impacts on Cereal Crop Growth and Development in Contaminated Soils

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