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Problematic Risk Assessments for Drinking Water Contaminants: Selenium, Aldicarb, and Nickel
Published in Rhoda G.M. Wang, Water Contamination and Health, 2020
Susan F. Velazquez, Kenneth A. Poirier
The essentiality and toxicity of selenium varies according to the valence state of selenium when incorporated into biomolecules and the form in which selenium is fed or administered. Although it is difficult to make as assessment for several selenium compounds by a similar mode of administration in a common animal species, there is general agreement that sodium selenite, sodium selenate, selenomethionine, and selenodigluta-thione are among the more toxic species (6). The relative potency of systemic toxicity for selenium compounds is also similar in both in vivo and in vitro experiments examining potency of antitumorigenic activity (21).
Bioavailability of selenium in soil-plant system and a regulatory approach
Published in Critical Reviews in Environmental Science and Technology, 2019
Quang Toan Dinh, Mengke Wang, Thi Anh Thu Tran, Fei Zhou, Dan Wang, Hui Zhai, Qin Peng, Mingyue Xue, Zekun Du, Gary S. Bañuelos, Zhi-Qing Lin, Dongli Liang
According to the dominant chemical form of Se, Se fertilizer can be divided into two types; inorganic and organic. The commonly used inorganic Se fertilizers include; sodium selenate (Na2SeO4) and sodium selenite (Na2SeO3); both of which belong to mineral Se fertilizers and are the most common forms of providing bioavailable Se to plants (Paciolla, De Leonardis, & Dipierro, 2011). In a previous pot study, Carvalho, Gallardo-Williams, Benson, and Martin (2003) used SeMet as organic Se fertilizer. However, to the best of our knowledge, the direct application of organic Se to improve Se bioavailability is not common due to its high cost, and also because of the volatility of SeMet. In general, organic Se fertilizers is more efficiently applied through Se-enriched plant materials or plant residues.