Critical mercury concentration in tropical soils: Impact on plants and soil biological attributes

Lima, Francielle Roberta Dias de; Martins, Gabriel Caixeta; Silva, Aline Oliveira; Vasques, Isabela C.F.; Engelhardt, Mateus Moreira; Cândido, Geraldo S.; Pereira, Polyana; Reis, Rayner H. C. L.; Carvalho, Geila Santos; Windmöller, Cláudia Carvalhinho; Moreira, F. M. S.; Guilherme, Luiz Roberto Guimarães; Marques, João José

doi:10.1016/j.scitotenv.2019.02.216

Cited by 31 publications

(9 citation statements)

References 53 publications

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“…Methyl-Hg in heavily contaminated soil in the Rhône Valley (Switzerland) accounted for < 0.8% of THg [99]. A number of factors that control microbial activity and/or the geochemical speciation of inorganic Hg 2+ govern MeHg formation in the environment [100]. Microorganisms that live in soil can transform inorganic Hg (II) species into Hg 0 by using the enzyme Hg reductase, which is found in various bacteria, such as Pseudomonas sp., Staphylococcus aureus, Thiobacillus and many others [101].…”

Section: Referencesmentioning

confidence: 99%

Mercury in the terrestrial environment: a review

2020

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Background Environmental contamination by mercury is and will continue to be a serious risk for human health. Pollution of the terrestrial environment is particularly important as it is a place of human life and food production. This publication presents a review of the literature on issues related to mercury pollution of the terrestrial environment: soil and plants and their transformations. Results Different forms of atmospheric Hg may be deposited on surfaces by way of wet and dry processes. These forms may be sequestered within terrestrial compartments or emitted back into the atmosphere, and the relative importance of these processes is dependent on the form of Hg, the surface chemistry, and the environmental conditions. On the land surface, Hg deposition mainly occurs in the oxidized form (Hg2+), and its transformations are associated primarily with the oxidation–reduction potential of the environment and the biological and chemical processes of methylation. The deposition of Hg pollutants on the ground with low vegetation is as 3–5 times lower than that in forests. The estimation of Hg emissions from soil and plants, which occur mainly in the Hg0 form, is very difficult. Generally, the largest amounts of Hg are emitted from tropical regions, followed by the temperate zone, and the lowest levels are from the polar regions. Areas with vegetation can be ranked according to the size of the emissions as follows: forests > other areas (tundra, savannas, and chaparral) > agricultural areas > grassland ecosystems; areas of land devoid of vegetation emit more Hg than those with plants. In areas with high pollution, such as areas near Hg mines, the Hg content in soil and plants is much higher than in other areas. Conclusions Mercury is recognized as a toxic, persistent, and mobile contaminant; it does not degrade in the environment and becomes mobile because of the volatility of the element and several of its compounds. Atmospheric contamination by mercury continues to be one of the most important environmental problems in the modern world. The general conclusions were drawn from a review of the literature and presented in this paper.

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Section: Referencesmentioning

confidence: 99%

Mercury in the terrestrial environment: a review

2020

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“…This finding may be attributed to the detoxification mechanism of soil and plants. Specially, soil microbes can become more resistant to higher Hg concentrations 36 , and the most significant bacterial Hg resistance mechanism is through the reduction of Hg 2+ to volatile Hg0 catalyzed by the merA gene 37 . In addition, Hg-tolerance mechanisms of potatoes may act by eliminating the detrimental effects of Hg 38 , such as preventing Hg 2+ from interfering with cell metabolic pathways via metal immobilization in the cell walls 39 , or metal chelation by organic acids and specific peptides 40 .…”

Section: Discussionmentioning

confidence: 99%

Potato (Solanum tuberosum L.) can be grown safety on human consumption in slight Hg-contaminated soils across China mainland

Yang

Gao

Zhang

et al. 2020

Sci Rep

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Mercury (Hg) exposure poses serious health risks to humans, resulting in extensive investigations examining Hg accumulation, biotransformation and uptake in crops. in this investigation, Hg accumulation in potato tubers due to bioaccumulation processes was determined and bioconcentration factors affecting bioaccumulation were identified using a greenhouse experiment. Our results showed that the percentage of available Hg concentrations from total Hg in soil samples were less than 1.2%, indicating that soils used in our experiment exhibited a high binding strength for Hg, with alkaline soil recording the lowest available Hg/total Hg ratio. Results indicated that soil type and Hg treatment, as well as their interactions, significantly affected Hg accumulation in potato tubers (P < 0.01). importantly, our results also indicated that potatoes grown in soil with a Hg concentration two times higher than the Chinese Environmental Quality Standard exhibited no obvious toxic effects on humans; Bioconcentration factors (Bcf) values (<0.04) suggested that potatoes can be considered as a low Hg accumulating species and suitable for human consumption. potato yields in acidic soil were lower than those in neutral or alkaline soils, making this medium unsuitable for growth.

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“…Historically, mining for gold and Hg led to high Hg concentrations in these mining areas, which may explain the high Hg concentrations in some samples from Central Italy, Northwest England and Eastern Slovakia. Moreover, the natural/background Hg level was 0.08 mg/kg in Brazil [131], 0.05 mg/kg in India [132], 0.23 mg/kg in New Zealand [133], 0.11 mg/kg in the Norwegian Arctic [134] and 0.4 mg/kg in Paris [136]. Most soil Hg was found as soil matrix-bound divalent Hg (Hg II ), whereas elemental Hg (Hg 0 ) was undetectable in soils [94,108,].…”

Section: Mercury In Soilmentioning

confidence: 98%

Mercury in the terrestrial environment: a review

Gworek¹,

Dmuchowski²,

Baczewska-Dąbrowska

2020

Preprint

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Environmental contamination by mercury is and will continue to be a serious risk for human health. Pollution of the terrestrial environment is particularly important as it is a place of human life and food production. Publication presents a review of the literature on issues related to Hg pollution of the terrestrial environment: soil and plants and their transformations. Different forms of atmospheric Hg may be deposited on surfaces by way of wet and dry processes. These forms may be sequestered within terrestrial compartments or emitted back into the atmosphere, and the relative importance of these processes is dependent on the form of Hg, the surface chemistry, and the environmental conditions. On the land surface, Hg deposition mainly occurs in the oxidized form (Hg 2+ ), and its transformations are associated primarily with the oxidation-reduction potential of the environment and the biological and chemical processes of methylation. The deposition of Hg on ground with low vegetation as 3–5 times lower than that in forests. The estimation of Hg emissions from soil and plants, which occur mainly in the Hg 0 form, is very difficult. Generally, the largest amounts of Hg are emitted from tropical regions, and the lowest levels are from the polar regions.

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Critical mercury concentration in tropical soils: Impact on plants and soil biological attributes

Cited by 31 publications

References 53 publications

Mercury in the terrestrial environment: a review

Mercury in the terrestrial environment: a review

Potato (Solanum tuberosum L.) can be grown safety on human consumption in slight Hg-contaminated soils across China mainland

Mercury in the terrestrial environment: a review

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