Chemical Fractionation and Risk Assessment of Some Heavy Metals in Soils, Assiut Governorate, Egypt

Salman, Salman; El‐Anwar, Esmat A. Abou; Asmoay, Ahmed; Mekky, H. S.; Wahab, Wael Abdel; Elnazer, Ahmed A.

doi:10.21608/ejchem.2021.59371.3276

Cited by 7 publications

(10 citation statements)

References 35 publications

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“…Different elements are well-categorized by their physicochemical forms in soils, especially in organic complexes, adsorbed in solid phases or constituents of solid/mineral phases, with diverse solubility (Wu et al, 2019;Salman et al, 2021). Plantaccessible forms represent the exchangeable complexes (organic and inorganic components) and soluble forms in soil solution taken predominantly by plants as divalent ions.…”

Section: Fractionation and Speciation Of Ptes In Soils And Their Inte...mentioning

confidence: 99%

Mechanisms of As, Cd, Pb, and Zn hyperaccumulation by plants and their effects on soil microbiome in the rhizosphere

Asare

Száková

Tlustoš

2023

Front. Environ. Sci.

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Excess potentially toxic elements (PTEs), including arsenic (As), cadmium (Cd), lead (Pb), and zinc (Zn), above permissible limits in the environment, have detrimental effects on trophic levels. Hence, imperative to devise advertent measures to address this situation, especially in the soil ecosystem: the major reservoir of many PTEs. Using aerial plant parts (shoot) to accumulate As, Cd, Pb, and Zn - hyperaccumulators are considered a permanent approach to PTE removal from soils. This communication expatiated the principles that govern the hyperaccumulation of plants growing on As, Cd, Pb, and Zn-contaminated soils. The contribution of soil microbial communities during hyperaccumulation is well-elaborated to support the preference for this remediation approach. The study confirms a flow direction involving PTE uptake–translocation–tolerance–detoxification by hyperaccumulators. Rhizosphere microbes exhibit a direct preference for specific hyperaccumulators, which is associated with root exudations, while the resultant formation of chelates and solubility of PTEs, with soil physicochemical properties, including pH and redox potential, promote uptake. Different compartments of plants possess specialized transporter proteins and gene expressions capable of influx and efflux of PTEs by hyperaccumulators. After PTE uptake, many hyperaccumulators undergo cellular secretion of chelates supported by enzymatic catalysis and high transport systems with the ability to form complexes as tolerance and detoxification mechanisms. The benefits of combining hyperaccumulators with beneficial microbes such as endophytes and other rhizosphere microbes for PTE removal from soils are vital in enhancing plant survival and growth, minimizing metal toxicity, and supplying nutrients. Inoculation of suitable rhizosphere microbes can promote efficient cleaning of PTEs contaminated sites utilizing hyperaccumulator plants.

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Section: Fractionation and Speciation Of Ptes In Soils And Their Inte...mentioning

confidence: 99%

Mechanisms of As, Cd, Pb, and Zn hyperaccumulation by plants and their effects on soil microbiome in the rhizosphere

Asare

Száková

Tlustoš

2023

Front. Environ. Sci.

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“…As, it was found high concentrations of these elements in Egyptian phosphate ores (Abou El-Anwar et al 2019b). Pollution indices were applied widely to study the enrichment of elements in soil and sediment to discriminate element source and adverse environmental impact (Abou El-Anwar et al 2021;Elnazer and Salman 2021;Mostafa et al 2023). The current study aims to investigate the occurrence of REEs in Agricultural soil in Assiut Governorate, discriminate their spatial distribution, source and enrichment degree.…”

Section: Introductionmentioning

confidence: 99%

Central Nile Valley agriculture soil content and distribution of rare earth elements (REEs), Egypt

Belal,

Abou El-Anwar,

Seleem

et al. 2024

Egyptian Journal of Geology

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he Nile Valley hosted the world's oldest civilizations because of the quality of the agricultural soil and the waters of the Nile River. Despite the importance of the Egyptian agricultural soil, there is a scarcity of information about its chemical and mineral composition. Therefore, this research is concerned with the soil content of rare earth elements (REEs), as it has become one of the elements with a harmful effect and considered emerging contaminants. The concentration of only 6 REEs were recorded in the agricultural soil of Assiut Governorate; Sc, Y, La, Ce, Sm and Nd with concentrations 26.6, 22.2, 33, 62.2, 8 and 30.6 µg/g, respectively. However, the average REEs (182.6 µg/g) was higher than the upper continental crust (179.4 µg/g), world soil (145.3 µg/g), Chinese soil background (163.86 µg/g). This indicates the enrichment of the Egyptian soil with these elements. This enrichment may be due to the nature of the source rocks or the applied fertilizers. Where phosphate fertilizers (rich in elements) are applied frequently to improve soil productivity.

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“…These indicators are primarily aimed at assessing the anthropogenic impact on soil quality and can reveal the potential impacts of trace elements on soil ecology, including the possibility of contamination (Wieczorek et al 2018;Kowalska et al 2018;Mekky et al 2019;Ciarkowska and Gambus 2020;Klimkowicz-Pawlas and Debeane 2020;Fazekašová and Fazekaš 2020). For several years, ecotoxicological tests have also been used in soil quality assessments (Baran et al 2014; Baran and Wieczorek 2015;Alves and Cardoso 2016;El-Alam et al 2018;Abou El-Anwar et al 2021;Salman et al 2021). All the above methods play an important role in monitoring soil quality to ensure the sustainability of agroecosystems.…”

Section: Introductionmentioning

confidence: 99%

“…Elements are released into the soil environment from both natural and anthropogenic sources. Some of these elements are macro-or micronutrients used by plants; therefore, land use, as well as the system and type of cultivation, affects their content in the soil (Lal 2015;Kopittke et al 2019;Salman et al 2021). Deforestation is a common feature of the onset of agricultural development in monsoon climates (Ramakrishnan 1992;Lal 2000).…”

Section: Introductionmentioning

confidence: 99%

Soil quality under different agricultural land uses as evaluated by chemical, geochemical and ecological indicators in mountains with high rainfall (Darjeeling Himalayas, India)

Kijowska-Strugała

Baran²,

Szara-Bąk³

et al. 2022

J Soils Sediments

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Purpose Agricultural land use associated with intensification in plant growing affects the physicochemical parameters of soils and thus soil quality. The aim of this study was to identify the quality of soils in the Peshok catchment in the Eastern Himalayas under different types of land use (tea, horticulture, rice), under high monsoon rainfall conditions. Methods Physical and chemical analysis were used, e.g. bulk density, pH, TOC, major and trace element content (such as Ca, Fe, K, Mg, Mn, Na, P, Ag, As, Ba, Cd, Co, Cr, Cu, Ga, Li, Mo, Ni, Pb, Sr and Zn) based on AntonPaar Multiwave 3000 microwave system and nitrogen and sulphur content using CNS Elementar Vario MAX cube analyser. In addition, ecotoxicological analyses were performed using the Microtox test. Soil quality was assessed on the basis of chemical indicators related to the mobility of trace elements (risk assessment code, individual contamination factor and global contamination factor); geochemical indicators (geoaccumulation index, enrichment factor, contamination factor, contamination degree, modified contamination degree, pollution load index and improved Nemerow pollution index); and ecological indicators (potential ecological risk coefficient and potential ecological risk index). A statistical package of Statistica v13 was used for statistical analysis. Results Soils in the analysed catchment are characterised by low contents of macro- and microelements. It was shown that natural factors, such as high precipitation and steep slopes, favour strong leaching of elements from the soil, and farming systems based on natural and chemical fertilisation, terracing and irrigation are not able to balance them fully. The contents of TOC and N as well as pH were determined mainly by the land use. Results of statistical analyses and geochemical indicators revealed the predominantly natural origins of elements. The higher Ga content indicated a relationship with the local geology and the higher Cu content with the use of fertilisers. Indicators showed a low ecological risk related to the presence of trace elements, and soil ecotoxicity to A. fischeri was generally determined by the acidic pH of the tested soils. Low mobility was observed for most elements, and regardless of the land use, the residual fraction predominated. Conclusion The study showed that use of many indicators can more fully describe soil quality in relation to land use, especially in the case of a low content of trace elements. Moreover, this approach helps to better understand the changes taking place in soil quality under different land uses in mountains with high rainfall.

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Chemical Fractionation and Risk Assessment of Some Heavy Metals in Soils, Assiut Governorate, Egypt

Cited by 7 publications

References 35 publications

Mechanisms of As, Cd, Pb, and Zn hyperaccumulation by plants and their effects on soil microbiome in the rhizosphere

Mechanisms of As, Cd, Pb, and Zn hyperaccumulation by plants and their effects on soil microbiome in the rhizosphere

Central Nile Valley agriculture soil content and distribution of rare earth elements (REEs), Egypt

Soil quality under different agricultural land uses as evaluated by chemical, geochemical and ecological indicators in mountains with high rainfall (Darjeeling Himalayas, India)

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