The chromatograms for aliphatic hydrocarbon compositions indicated that the sources could be either from petrochemicals and/or from biogenic / terrestrial sources, which will be discussed later.
Table-2: Concentrations (ppm, d.w.) of extractable organic matter (EOM), total petroleum hydrocarbons (TPH), total poly aromatic hydrocarbons (TArH), resolved aliphatic hydrocarbons (rAH) (C11-C30, phytane and pristane), unresolved complex mixture (UCM) and total aliphatic hydrocarbons (TAH) for the studied stations.
Among the different fractions (rAH, TArH, UCM), unresolved aliphatic hydrocarbons (UCM) represented the highest levels which may reflect high degradation in the studied area (Fig.
The aliphatic material represented by the pentane fractions 1 and 2 showed a decrease from 18.15 wt.% to 10.80 wt.% for nitrogen and nitrogen/steam fluidisation pyrolysis, respectively.
Detailed examination of the aliphatic fractions by GC/MS was not carried out.
, Williams and Taylor , Williams and Besler , and Williams and Nazzal , or via conversion of hydrogen-poor materials to coke, and cracking of aliphatic moieties to gas resulting in the selective concentration of aromatic compounds as reported by Burnham .
Offers modified aliphatic amine blends for replacing MDA-type hardeners.
Apco 2330 is a 100%-aromatic epoxy curing agent containing no MDA; Apco 2180, an aliphatic mine, is a room-temperature curing agent; Apco Safe-T-Poxy 2183 is a nonirritant, room-temperature hardener; and Apco 2320, an aromatic amine, is a high-tempera-ture hardener.
Offers polyamides, anhydrides, and aliphatic, amido, cycloaliphatic, aromatic, tertiary, and boron trifluoride amines.
Variables used to characterize the internal dose of HCs measured in the 63 breath samples were aliphatic [C.sub.6]-[C.sub.16] (AUC) and BTEX (parts per billion), each dichotomized above and below their respective medians.
Covariates retained for regression models containing breath analyte exposure variables dichotomized about the median for aliphatic ([C.sub.6]-[C.sub.16]) and BTEX included illness and/or fever > 101[pounds sterling]F, alcoholic beverages, maximum job strain, race group, and age.
Figure 1 illustrates mean endocrine levels across the menstrual cycle for participants' high and low aliphatic HC ([C.sub.6]-[C.sub.16]) levels and highlights the four study end points.