A review on environmental selenium issues

Gebreeyessus, Getachew Dagnew; Zewge, Feleke

doi:10.1007/s42452-018-0032-9

Cited by 47 publications

(26 citation statements)

References 95 publications

(128 reference statements)

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“…In well or underground water, Se originates from both atmospheric deposits and soil drainage and, although in most cases it does not exceed 10 µg/L, Se levels may approach hundreds of µg/L as a consequence of increasing overuse of Se-based fertilizers [ 6 , 24 , 25 ]. Hence, in the last few decades, Se contamination in ground and surface water in numerous river basins worldwide has become a critical issue [ 26 ]. Moreover, concentration increases depending on pH as a result of conversion into compounds of greater solubility in water, such as selenites and selenates [ 27 ], which show a pro-oxidant action in the organisms and are considered very toxic in case of elevated intake [ 26 ].…”

Section: Selenium In the Environmentmentioning

confidence: 99%

Selenium: An Element of Life Essential for Thyroid Function

et al. 2021

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Selenium (Se), a microelement essential for life, is critical for homeostasis of several critical functions, such as those related to immune–endocrine function and signaling transduction pathways. In particular, Se is critical for the function of the thyroid, and it is particularly abundant in this gland. Unfortunately, Se deficiency is a very common condition worldwide. Supplementation is possible, but as Se has a narrow safety level, toxic levels are close to those normally required for a correct need. Thus, whether the obtaining of optimal selenium concentration is desirable, the risk of dangerous concentrations must be equally excluded. This review addressed the contribution by environment and food intake on Se circulating levels (e.g., geographical factors, such as soil concentration and climate, and different quantities in food, such as nuts, cereals, eggs, meat and fish) and effects related to its deficiency or excess, together with the role of selenium and selenoproteins in the thyroid pathophysiology (e.g., Hashimoto’s thyroiditis and Graves’ disease).

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Section: Selenium In the Environmentmentioning

confidence: 99%

Selenium: An Element of Life Essential for Thyroid Function

et al. 2021

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“…The difference between first and second harvest was significant (P > 0.05) according to used statistical analyses (table 3), since the fortification did not take place after first harvest. Though, selenium fortification is important for normal human physiology in selenium deficient environments, it needs to be minimized or removed from selenium rich environmental media (Gebreeyessus and Zewge, 2019). Results indicated that the 50g/ha concentration of sodium selenate application in the form of foliar spray significantly enhanced the selenium content in garlic bulb (3.23±0.16mgSe/Kg) and vegetative part (15.46±0.71mgSe/Kg) where a 12.52 and 7.8 fold increase was observed respectively, as compared to control by Shafiq et al (2019).…”

Section: Selenium Contentmentioning

confidence: 99%

“…Selenium is biologically active at low concentrations for normal growth and development, and at moderate concentrations for homeostatic function (Hamilton, 2004). In human, low dietary selenium intakes are associated with health disorders including oxidative stress-related conditions, reduced fertility andimmune functions and an increased risk of cancers (Gebreeyessus and Zewge, 2019). Recommended appropriate dietary Se intake for healthy adult men is 80 μg day-1 and 55 μg day-1 for adult women, whereas a maximal daily safe dietary Se intake up to 400μg has been suggested for adults by WHO/IPCS (Ozkutlu et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Effect of Foliar Application of Selenium on Its Uptake and Yields in Basils

Mezeyová¹,

Hegedüsová²,

Hegedűs³

et al. 2019

AGR

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Basil is one of the most used spices in Slovakia. Selenium is an essential element for normal growth and development of the organism and because Slovak soils are poor in this element, the various ways of this antioxidant increasing in the food chain has being sought. The aim of the work was to evaluate influence of selenium biofortification on selenium content of Ocimum basilicum - variety ´Dark Green´, which was, in conditions of the Slovakia, well known and wide spread grown, as well as on the opal basils (´Purple Ruffles´ and ´Red Rubin´) and on Ocimum tenuiflorum – Tulsi. The influence of fortification on the yields of basils was also tested. The selenium content and the yields of selected basils were compared in dependence on the selenium fertilization, two terms of harvest and morphological variability. Small-scale field experiment was carried out at the Department of Vegetable Production, Slovak University of Agriculture in Nitra, 2016. Selenium was applied foliar at a dose 50 g Se / ha in the form of sodium selenate. In two harvests the values of selenium built in plants and the economically interesting quantitative data – the yields per ha were evaluated. Statistical methods were used for statistical evaluation by the help of Statgraphics Centurion XVII (StatPoint Inc. USA), with multifactor analysis of variance (ANOVA) and LSD test. Foliar application of selenium had a positive effect of selenium content in case of all tested basils. The yields were also positively affected where values of fresh mass in selenised variants ranged from 1.43 (´Purple Ruffles´) to 13.71 t/ha (Tulsi).

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“…Furthermore, investigations of selenium pollution, cycling, interaction, and biological treatment approaches have been reported in literature [23][24][25][26]. Wadgaonkar et al [27] reviewed the microbial transformation of selenium in soil and sediments and more recently, Getachew and Zewge [28] presented a scan of environmental issues caused by selenium.…”

Section: Introductionmentioning

confidence: 99%

Environmental Impacts of Selenium Contamination: A Review on Current-Issues and Remediation Strategies in an Aqueous System

Okonji

Achari

Pernitsky

2021

Water

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In both aquatic and terrestrial environment, selenium contamination may exist at concentrations above the micronutrient limit. Since there is such a narrow bandwidth between which selenium concentration is acceptable, the health of the public may be at risk of selenium toxicity once the concentration increases beyond a threshold. Selenium contamination in an aqueous environment can occur due to anthropogenic activities and/or from natural sources. This study presents a review of the forms of selenium, inorganic and organic selenium contamination, mobilization, analytical methods for various forms of selenium and remediation strategies. The review also provides recent advances in removal methods for selenium from water including bioremediation, precipitation, coagulation, electrocoagulation, adsorption, nano-zerovalent iron, iron co-precipitation and other methods. A review of selenomethionine and selenocysteine removal strategy from industrial wastewaters is presented. Selenium resource recovery from copper ore processing has been discussed. Various analytical methods used for selenium and heavy metal analysis were compared. Importantly, existing knowledge gaps were identified and prospective areas for further research were recommended.

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A review on environmental selenium issues

Cited by 47 publications

References 95 publications

Selenium: An Element of Life Essential for Thyroid Function

Selenium: An Element of Life Essential for Thyroid Function

Effect of Foliar Application of Selenium on Its Uptake and Yields in Basils

Environmental Impacts of Selenium Contamination: A Review on Current-Issues and Remediation Strategies in an Aqueous System

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