Elemental sulfur (S(0)) is an important intermediate in the biogeochemical cycle of sulfur that is formed by chemical or biological oxidation of more reduced sulfur species. Given the restricted geochemical con
The total amount of sulfur and sulfides is defined as the sulfur content of the crude oil. Normally the sulfur content can vary from 0.05% to 14%. The main sulfides in crude oil are organic, but small amounts of elemental sulfur and hydrogen sulfide (H2S) may exist. The organic sulfides...
At the same time, we can expect that the energy of interaction with molecules from the ‘second solvation shell’ will be of the order of, or lower than kBT. Thus, the P4·6C6H6 particle can be considered as a stable structural block with characteristic geometric parameters of ~ 1 nm, ...
CH, CO, NH lines). Calculations suggest that molecular abundances are under-estimated owing to the overlooked effect of photo-dissociation of molecules (Popa et al.2023). The systematic bias influences all other species with low photo-dissociation potentials, such as OH, NH, CO. Lines from low...
Hydrogen plays a particularly important role in acid–base reactions because these reactions usually involve the exchange of protons between soluble molecules. In ionic compounds, hydrogen can take the form of a negative charge (i.e., anion) where it is known as a hydride, or as a positively...
As discussed above, the density distribution of USPs does not scatter around the line for planets with Earth-like compositions, as there are many planets of smaller density. Perhaps this is a sign that all these planets host atmospheres that are not extended, perhaps containing molecules with a...
How many equivalent resonant forms can be drawn for CO_3? (a) 1 (b) 0 (c) 3 (d) 4 (e) 2 What is/are the forms in which sulfur and chromium can be found? Explain your answer. Boron nitride, BN, is a very hard material, harder than diamond if prepared properly. Explain...
Elemental sulfur (S(0)) is an important intermediate in the biogeochemical cycle of sulfur that is formed by chemical or biological oxidation of more reduced sulfur species. Given the restricted geochemical conditions under which S(0) should persist, the mechanisms whereby S(0) can be stabilized...
Different strategies for Sb speciation analysis have been reported in recent years, as can be seen in the summary presented in Table 1. One of them involved the use of hybrid nanoparticles (NPs) composed of oxidized multi-walled carbon nanotubes (MWCNTs) and nano-TiO2 as solid sorbent for the...
The spectrum can be evaluated with suitable software and the atoms, ions and simple molecules contained in the plasma can be determined qualitatively via the characteristic lines [13]. By using certified reference materials (CRMs), it is possible to establish a calibration that also quantifies ...