Selenium

Schrauzer, Gerhard Norbert

doi:10.1002/9783527619634.ch58

Cited by 8 publications

(6 citation statements)

References 225 publications

(186 reference statements)

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“…However, the essentiality of Se has distinct limitations. Toxic eff ects have been found in areas with low Se as well as with high Se in the environment (Levander, 1986;Burk, 1994;Combs, 2001;Schrauzer, 2004). Selenium interaction with several toxic metals such as arsenic, mercury, cadmium and silver has been described (Glattre, 1995;Sasakura and Suzuki, 1998).…”

Section: Introductionmentioning

confidence: 97%

Influence of selenium dose on mercury distribution and retention in suckling rats

Orct¹,

Lazarus²,

Jurasović³

et al. 2009

J of Applied Toxicology

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It is well known that metal-metal interactions in the body are age-dependent. We studied the influence of increasing selenium (Se) doses on mercury (Hg) distribution and retention in the postnatal period in Hg-exposed suckling rats. Seven-day-old Wistar pups were pretreated with three different oral doses of Se as sodium selenite (6.45, 12.9 and 19.4 micromol Se kg(-1) b.w.) over 3 days. This was followed by simultaneous Se (as sodium selenite) and Hg (as mercury chloride) oral administration over 4 days. The molar ratio between Se and Hg given to pups was 1:1, 2:1 and 3:1, respectively. Mercury and Se were measured in brain, kidneys, liver, plasma, erythrocytes and urine of pups on the day after the last administration by atomic absorption spectrometry. Results showed that in all samples Se concentrations rose almost proportionally to the dose of Se given to pups. Mercury concentration in organs, plasma and urine decreased with higher oral doses of Se. However, Hg concentration in erythrocytes increased with increasing Se dose. There was evidently a redistribution of Hg from plasma to erythrocytes at higher ratio of Se:Hg. Approximately equimolar doses of Se and Hg are necessary to produce maximum uptake of Hg by plasma and liver and minimum retention of Hg in the kidney and erythrocytes.

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Section: Introductionmentioning

confidence: 97%

Influence of selenium dose on mercury distribution and retention in suckling rats

Orct¹,

Lazarus²,

Jurasović³

et al. 2009

J of Applied Toxicology

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“…According to Tamaoki et al (2008), results showed that S and Se had shared metabolic and root absorption mechanisms, which were present and distributed similarly in many plants. Selenium concentrations in most plants, grains, and grasses are typically between 0.05 and 1 mg/kg, with few exceeding 30 mg/kg (Schrauzer 2004). European fruits, vegetables, and cereals provide between 0.002-0.88 mg/kg of Se (Schrauzer 2004).…”

Section: Resultsmentioning

confidence: 99%

Assessment of heavy metals accumulation in Celtis tournefortii Lam and Prosopis farcta from Mazne subdistrict, Kurdistan region of Iraq

Abdulwahid-Kurdi,

Khalid,

Abdulwahid

et al. 2023

Preprint

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Most of the world's population relies on medicinal plants as their main source of healthcare. Therefore, it is crucial to ascertain the amount of heavy metals accumulated in medicinal plants. In this study, elements (Ca, P, Mg, Na, K, S, Fe, Cu, Zn, Se, Cd, V, Cr, Ni, Ag, Be, Sr, Ba, Al, Pb, Bi, Rb, B, As, and Sb) found in Celtis tournefortii Lam and Prosopis farcta that were gathered from the Mazne sub-district of Kurdistan in Iraq were identified. Using inductively coupled plasma mass spectrometry (ICP-MS) and inductively coupled plasma optical emission spectrometry (ICP-OES), concentrations of 25 elements in the leaves, fruit (Celtis tournefortii Lam), pod, and seed (Prosopis farcta) were identified. An exploratory study of samples was conducted using principal component analysis (PCA) and hierarchical cluster analysis (HCA). For Cd, Cr, Ni, Pb, and As. The elements quantified by ppm are: Ca (3403–81948), Mg (1573–7578 ), Na (108–291), K (6481–23212), Fe (184–623), Cu (8–16), Zn (3–48), Se (0.5–33), Cd (0.11–0.40 ppm), V (1–3), Cr (2–25), Ni (2–4), Ag (0.5–1.7), Be (0.20–0.40), Sr (79.3–454), B (3–86), Al (100–738), Bi (0.7–2.30), Rb (1–7), B (0.7–2.3), As (0.1–3.9), Sb (6.60–12). All of the samples under investigation contained similar levels of phosphorus and lead (218 and 1, respectively). The samples were divided into three major categories, as demonstrated by PCA and HCA. According to the findings, the fruit of Celtis tournefortii Lam is a source of Mg, K, Cu, Cd, Cr, Be, Sr, Ba, and Rb. The seeds of Prosopis farcta had accumulated a significant level of S, Zn, Se, and Ni. The data usually implies that using these plants poses a risk to people.

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“…It is well known that Se, as an essential trace element vital for metabolic and central nervous system functions [ 60 , 61 ], may counteract MeHg toxicity. It has been suggested that molar excess of Se over Hg, expressed as the Se:Hg molar ratio, protects against MeHg toxicity [ 62 , 63 , 64 ], where the higher ratios (e.g., 5:1 and higher) are considered to provide better protection against MeHg toxicity than lower ratios [ 62 , 65 , 66 , 67 ].…”

Section: Resultsmentioning

confidence: 99%

Potentially Toxic Elements in Water, Sediments and Fish from the Karstic River (Raša River, Croatia) Located in the Former Coal-Mining Area

Kljaković-Gašpić

Sekovanić

Orct

et al. 2022

Toxics

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The assessment of the environmental quality of a sensitive karst aquatic system under the centuries-long anthropogenic influence of the coal mining industry is important for both improving the quality of water resources and protecting aquatic wildlife and human health. In this study, we investigated the anthropogenic impact on the aquatic environment of the upper and middle course of the Raša River through the analysis of a suite of metal(loid)s in three aquatic compartments (water, sediment, fish) using inductively coupled plasma mass spectrometry (ICP-MS). Concentrations of inorganic constituents in water were low, while the chemical composition of stream sediments mainly reflected the geological background of the area, indicating the origin of metal(loid)s from predominantly natural sources. Although comparison with PEC-Q values indicated that existing sediment quality conditions could pose a threat to benthic organisms with regard to Cr and Ni, the constant vertical profiles of these elements suggested their natural origin from the weathering of flysch. Element levels in the muscle of targeted fish species were in accordance with the values typical for low-contaminated freshwater systems, while levels of Cd, Pb and Hg were mostly below the European regulatory limits for toxic elements in foods, indicating that the low concentrations of most contaminants in muscles of fish from the Raša River do not present a risk to humans or other consumers. The obtained data indicated a generally low contamination status of the western part of the Raša River basin with regard to the analyzed inorganic elements.

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Selenium

Cited by 8 publications

References 225 publications

Influence of selenium dose on mercury distribution and retention in suckling rats

Influence of selenium dose on mercury distribution and retention in suckling rats

Assessment of heavy metals accumulation in Celtis tournefortii Lam and Prosopis farcta from Mazne subdistrict, Kurdistan region of Iraq

Potentially Toxic Elements in Water, Sediments and Fish from the Karstic River (Raša River, Croatia) Located in the Former Coal-Mining Area

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