Distribution of vanadium and vanadyl porphyrins in petroleum distillates of different chemical types

Influence of anthropogenic combustion emissions on the deposition of soluble aerosol iron to the ocean: Empirical estimates for island sites in the North Atlantic

“…Thus we propose that the elevated solubilities of V, Ni and Fe in the V-rich FeATMISS aerosols are likely associated with anthropogenic combustion aerosols produced in North America. In this regard, it is important to note that both vanadium and nickel are highly enriched in crude oil, relative to other metals, as the maturation process leads to the formation of vanadyl-and nickel porphyrin compounds (Aleshin et al, 1984;Lewan, 1984;Amorim et al, 2007;Rana et al, 2007). Hence, the combustion of heavier fuel oil fractions in electrical power plants, heating boilers and ships produce aerosols that are rich in V and Ni (Rahn, 1981;Bacci et al, 1983;Spengler and Thurston, 1983;Mamane et al, 1986Mamane et al, , 2008Divita et al, 1996;Tsai and Tsai, 1998;Li, 2000;Vitolo et al, 2000Vitolo et al, , 2001Wang et al, 2006;Navarro et al, 2007;Seggiani et al, 2007).…”

The stable isotope composition of vanadium, nickel, and molybdenum in crude oils

“…determine oil migration, geochronology and/or fingerprinting (e.g., Manning et al, 1991;Selby and Creaser, 2005). Crude oils are commonly enriched in transition metals such as V, Ni, and Mo (Aleshin et al, 1984;Amorim et al, 2007). Technical advances now allow the exploration of stable isotope compositions for these three elements in crude oils.…”

Distribution of Total Sulfur in Acidic, Basic, and Neutral Fractions on Brazilian Asphalt Cements and Its Relationship to the Aging Process

“…Chemical transformation of polar fractions in asphalts involve also the formation of ketones and alcohols concurrently with sulfoxides, being alcohols the main contributors to oxidative aging of asphalts with high content of sulfur . Furthermore, ketones are formed primarily from the oxidation of benzyl carbons in side chains attached to highly condensed aromatic ring systems, which exist largely in the polar aromatics fraction of asphalts. , Beyond the organic compounds containing basically sulfur, nitrogen, and oxygen as heteroatoms, metallorganic compounds, such as vanadyl porphyrins, have been also described for asphaltic matrices and are also involved in the aging processes. , …”

“…4,5 Beyond the organic compounds containing basically sulfur, nitrogen, and oxygen as heteroatoms, metallorganic compounds, such as vanadyl porphyrins, have been also described for asphaltic matrices and are also involved in the aging processes. 6,7 In this context, chemical transformations involving specific classes of sulfur compounds, such as thiophenes, sulfides, sulfoxides, and sulfones of acidic, basic, and neutral character were studied by Green, Payzant, and co-workers. 8−13 According to these works, there is a distribution of species according to their acid−base character in each respective class of sulfur compounds.…”