Topic
Selenium
About: Selenium is a research topic. Over the lifetime, 21192 publications have been published within this topic receiving 429715 citations. The topic is also known as: Se & selen.
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TL;DR: In this article, the atomic line emission from the elements in an inductively coupled plasma source after their introduction as the gaseous hydrides was investigated, and mutual interferences between the analytes were found to be negligible under the operating conditions used.
Abstract: In the simultaneous determination of arsenic, antimony, bismuth, selenium and tellurium by measurement of the atomic line emission from the elements in an inductively coupled plasma source after their introduction as the gaseous hydrides, two types of possible interferences were investigated. Mutual interferences between the analytes were found to be negligible under the operating conditions used. The presence of certain metal ions in solution resulted in low recoveries of some of the analytes, especially selenium and tellurium. However, this could be overcome by prior separation of the analytes by co-precipitation on lanthanum hydroxide.
232 citations
TL;DR: Despite the apparent lower bioavailability of zinc, copper, manganese, and selenium in vegetarian diets, the trace element status of most adult vegetarians appears to be adequate; children, however, appear to be more vulnerable to suboptimal zinc status.
232 citations
TL;DR: The purification and kinetic parameters are suggestive of the potential of human plasma glutathione peroxidase as an important regulator of plasma hydroperoxide levels.
232 citations
TL;DR: The results indicate that precursor conversion limits the rate of nanocrystal nucleation and growth and are interpreted in light of a mechanism where the precursors react in an irreversible step that supplies the reaction medium with a solute form of the semiconductor.
Abstract: The kinetics of cadmium selenide (CdSe) nanocrystal formation was studied using UV−visible absorption spectroscopy integrated with an automated, high-throughput synthesis platform. Reaction of anhydrous cadmium octadecylphosphonate (Cd-ODPA) with alkylphosphine selenides (1, tri-n-octylphosphine selenide; 2, di-n-butylphenylphosphine selenide; 3, n-butyldiphenylphosphine selenide) in recrystallized tri-n-octylphosphine oxide was monitored by following the absorbance of CdSe at λ = 350 nm, where the extinction coefficient is independent of size, and the disappearance of the selenium precursor using {1H}31P NMR spectroscopy. Our results indicate that precursor conversion limits the rate of nanocrystal nucleation and growth. The initial precursor conversion rate (Qo) depends linearly on [1] (Qo(1) = 3.0−36 μM/s) and decreases as the number of aryl groups bound to phosphorus increases (1 > 2 > 3). Changes to Qo influence the final number of nanocrystals and thus control particle size. Using similar methods, w...
232 citations