Questions related to Metalloids
There are several definitions and/or descriptions of metals/metalloids (e.g. Arsenic, Cadmium, & Lead) according to different authors. Authors mostly lend toward different academic backgrounds, for example, chemistry, ecotoxicology, environmental science, health, etc. yet they are discussing in a similar context. But what are the most appropriate terms that define/describe metals/metalloids in the environment and why should we use them uniformly in this context?
1. Heavy metals
2. Potentially toxic metals
3. Potentially toxic elements
4. Toxic metals/elements
Hello everyone. How can we verify from band diagram, weather the band crossing is pointing towards Dirac metals or weyl metals or it is just normal band crossing.? What observation we should make? What confirmations we need to do ? More generally, just looking at the band structure how could we could say. Please guide me. Thanks.
Arsenic and its species are found highly mobile in environment. Due to the oxidation states in which it occurs makes it significantly reactive with other metals and metalloids compounds. During speciation analysis of environmental samples, difficulties arises when unknow compounds of arsenic are found.
To understand QM the problem is that sometime there is wrong hypothesis, but as we have learned it from our Professor, it can be very difficult to suspect it. The case of the octet rule is one example. According to this rule in a chemical compound the electrons of the metal complete the shell of the metalloid to give a full outermost shell. But, since 1962 we know that Xenon compounds exist: Chernick C.L., Rec. Chem. Prog., 24, 139-155, (1962), see also “From Ln valence to that of 3d”.
I think that the deep difficulties in QM are in fact to correct our wrong hypothesis.
Hello every body
Does any one has any idea to help me choose a reasonable basis set for intermediate metal ions (i.e Fe2+, Mn2+, Cu2+ and exc.) interactions with guanine or other DNA organic bases. I will be thank full if you mention the reference article too.
Can somebody please put some light on how the position of band inversion, near or away the Fermi level affects the electrical transport and thermal properties in semi-metals?
Thanks in advance!
I know reduction reaction of Silica with carbon, also principle of Zone refining or single-crystal generation process. I also heard of silicon chloride purification process,But I know not ore dressing, beneficiation and pretreatment of silica as well as preliminary purification of silicon (say from 80% Si to 99.9% Si). Please inform me and refer to suitable research
In a recent experimentation where we tested an agent's effect on the oxidative stress status on mice (inflammatory model of IBD), we found that livers and colons present a similar response plot.
In the aim to dig deeper, we tried to test our agent on mitochondrial swelling (in vitro). We were surprised to find that low doses induced a significant decrease in Liver mitochondrial activity compared to colons, which were not affected.
any speculation regarding this phenomena is deeply appreciated.
PS: The agent used has a metalloid characteristics.
Currently in study heavy metals (Pb, Cd, Cr) and metalloid (As) in freshwater sediment. just wonder if we can use dry ashing for the digestion instead of wet digestion, eg, using aqua regia
I want to know the mechanism of the reactions of highlighting alkaloids by metals and metalloids
Abiotic stresses such as drought (water deficit), excessive watering (water-logging/flooding), extreme temperatures (cold, frost and heat), salinity (sodicity) and mineral (metal and metalloid) toxicity etc. So, which one is your target?
Values on USA context would be helpful. I have been searching through the USEPA and USDA pages, but looking for more compact values in mg/kg. If US context is not available, global values are also appreciated.
Schaller, J., Vymazal, J., Brackhage, C., 2013. Retention of resources (metals, metalloids and rare earth elements) by autochthonously/allochthonously dominated wetlands: A review. Ecol. Eng. 53, 106-114.?