A previous limiting factor of non-biological, chemical/physical selenium removal from wastewater streams has been the interference of competing ions with the oxidized selenium compounds in precipitation reactions. Water is the closest thing to a universal solvent, and virtually all wastewater streams contain numerous constituents.
Revised IDLH: 1 mg Se/m 3 Basis for revised IDLH: The revised IDLH for selenium compounds is 1 mg Se/m 3 based on acute toxicity data in animals [Olson 1986; Pletnikova 1970a, 1970b]. This may be a conservative value for selenium compounds in general since it is based on sodium selenite, which is orders of magnitude more toxic than many other selenium compounds.
Selenium Compounds Hazard Summary Selenium is a naturally occurring substance that is toxic at high concentrations but is also a nutritionally essential ... exposed to high levels of selenium in food and water have reported discoloration of the skin, pathological deformation and …
Selenium is a mineral found in the soil. Selenium naturally appears in water and some foods. While people only need a very small amount, selenium plays a key role in the metabolism.. Why do people ...
some areas, selenium levels in groundwater may approach 6000 µg/l (Cannon, 1964). Concentrations increase at high and low pH as a result of conversion into compounds of greater solubility in water. Levels of selenium in tap water samples from public water supplies around the world are usually much less than 10 µg/l but may exceed 50
selenium in water soluble, nonprotein forms. Blind staggers causes animals to wander, walk in circles, and to have ... Various selenium compounds are likely to exhibit different intensities of toxicosis to animals. Also, plants, such as Astragalus and Happlopappus, contain other
Production in 1985 was reported to be 429,515 pounds. Selenium compounds are released to the air during the combustion of coal and petroleum fuels, and during the smelting and refining of other metals. From 1987 to 1993, according to the Toxics Release Inventory selenium releases to land and water totaled over 1 million lbs.
The 4 natural oxidation states of selenium are elemental selenium (0), selenide (-2), selenite (+4), and selenate (+6). Inorganic selenate and selenite predominate in water whereas organic selenium compounds (selenomethionine, selenocysteine) are the major selenium species in …
In one process, these selenium compounds are converted by water to selenious acid. The selenium is finally recovered by treating the selenious acid with sulfur dioxide. Selenium is a common component of ores valued for their content of silver or copper; it becomes concentrated in the slimes deposited during electrolytic purification of the metals.
Please use one of the following formats to cite this article in your essay, paper or report: APA. Meštrović, Tomislav. (2020, May 21). Study shows selenium-containing compounds inhibit SARS-CoV ...
A community in northern Italy was previously reported to have an excess incidence of amyotrophic lateral sclerosis among residents exposed to high levels of inorganic selenium in their drinking water. To assess the extent to which such association persisted in the decade following its initial observation, we conducted a population-based case-control study encompassing forty-one newly-diagnosed ...
8 Each water system must certify, in writing, to the state (using third-party or manufacturer's certification) that when acrylamide and epichlorohydrin are used to treat water, the combination (or product) of dose and monomer level does not exceed the levels specified, as follows:
8 Each water system must certify, in writing, to the state (using third-party or manufacturer's certification) that when acrylamide and epichlorohydrin are used to treat water, the combination (or product) of dose and monomer level does not exceed the levels specified, as follows:
Selenomethionine is an amino acid containing selenium that cannot be synthesized by higher animals, but can be obtained from plant material. Selenomethionine is the major seleno-compound in cereal grains (wheat grain, maize and rice), soybeans and enriched yeast.
ATSDR - Public Health Statement: Selenium. Jan 21, 2015 · Selenium compounds that can dissolve in water are sometimes very mobile. Thus, there is an increased chance of exposure to these compounds. Selenium may enter surface water in irrigation drainage waters.
The compounds can enter receiving bodies of water, as illustrated below. Although selenium is nutritionally essential for animals and humans in very small amounts, it can be quite toxic in higher ...
The primary water-soluble selenium forms in aqueous media that are bioavailable to humans are inorganic selenate (SeO 4-2) and selenite (SeO 3-2) ions. Compared to drinking water, food is the major overall source of selenium for humans. Moderately water-soluble organic selenium compounds such as selenomethionine and selenocysteine are
Garlic is known for its capacity to accumulate sulfur (S) and selenium (Se) in its bulbs. Therefore, it is a brilliant plant crop for S and Se biofort…
CAS Number Synonym(s) Caswell No, 732; CI 77805; Elemental selenium; Gray selenium; Selenium alloy; Selenium base; Selenium compounds; Selenium dust; EPA Pesticide Code: 072001
Some selenium compounds are very toxic and harmful to things that live in water. Consuming around 5 mg of selenium per day can kill a human being after a certain amount of time. Related pages. Selenium compounds; References This page was last changed on 5 May 2020, at 04:14. ...
Selenium Chemistry. Selenium is an element with symbol Se and atomic number 34. It is located in the periodic table beneath elemental sulfur; selenium oxides (selenate and selenite) are chemically similar to sulfate. Selenium is found in metal sulfide ores, where it partially replaces sulfur (Wikipedia, 2015).
Selenium (Se) and its oxyanions are emerging contaminants of major health and environmental concern. The contamination of the environment by selenium compounds can originate from various sources that include agricultural drainage water, mine drainage, residues from fossil fuel, thermoelectric power plants, oil refineries and metal ores.
Elemental selenium (14) and selenium sulfide (15) are poorly absorbed. After absorption, water-soluble selenium compounds appear to be rapidly distributed to most organs, the highest concentrations being in kidney, liver, spleen, and testes (16,17). Selenium compounds are biotransformed into excretable metabolites, including unknown as
Selenium and its compounds are harmful to the environment. About these substances. This screening assessment focuses on the selenium moiety, and therefore includes all forms of selenium found in commerce and those found in the environment, which are referred to collectively as selenium and its compounds.
Organo-selenium compounds undergo photo-oxidation in water and their mineralization eventually yields inorganic selenium species (Chen et al. 2005). 5.1.2 Sediment Selenium speciation in sediments is controlled by micro- and macro-scale chemical and physical properties of sediments as well as by biotic factors (Belzile et al. 2000; Stolz et al ...
Selenium in drinking water can come from discharge from mines, natural deposits, dischage from refineries, or from agricultural runoff leaching natural selenium compounds from dry, undeveloped land. What are the Health Effects of Selenium Exposure?
The present invention provides an efficient and highly effective method of removing dissolved selenium from a variety of refinery process water and wastewater streams. The present invention also provides a new and effective method of oxidizing selenium and organo-selenium compounds to the selenite [+IV] oxidation state in order to be adsorbed by a metal oxide or metal hydroxide precipitate.
Jan 10, 2018· 1. Biochim Biophys Acta Gen Subj. 2018 Jan 10. pii: S0304-4165(18)30006-0. doi: 10.1016/j.bbagen.2018.01.006. [Epub ahead of print] Selenolanthionine is the major water-soluble selenium compound in the selenium tolerant plant Cardamine violifolia.
T1 - Acceleration of electroreduction reaction of water-soluble selenium compounds in the presence of methyl viologen. AU - Koshikumo, Fumiya. AU - Murata, Wakana. AU - Ooya, Akiyuki. AU - Imabayashi, Shin Ichiro. PY - 2013/5/1. Y1 - 2013/5/1
Jan 21, 2015· Selenium compounds that can dissolve in water are sometimes very mobile. Thus, there is an increased chance of exposure to these compounds. Selenium may enter surface water in irrigation drainage waters. Some evidence indicates that selenium can be taken up in tissues of aquatic organisms and possibly increase in concentration as the selenium ...
Selenium dioxide is an industrial exposure hazard since it forms selenite, an irritant, with water or sweat. Other selenium compounds released during coal or petroleum combustion may …
Aug 20, 2019· Selenium is an essential mineral that's vital to your health. ... Antioxidants are compounds in foods that prevent cell damage caused by ... Drinking enough water …