Sentence examples for ferrous minerals from inspiring English sources

Using this technique, high concentrations of ferrous minerals appear brightly colored in the third axis of the Principal Components Analysis ('PC3'), while oxides show the opposite in PC4.

Laboratory batch experiments were performed to assess the impacts of temperature and mineralogy on the abiotic dechlorination of tetrachloroethene (PCE) or trichloroethene (TCE) due to the presence of ferrous minerals in natural aquifer clayey soils under anaerobic conditions.

The geologically controlled sources of natural H2 can be grouped according to four main families of processes: (1) water hydrolysis processes (several processes that include the oxidation of ferrous minerals, radiolysis, cataclasis, and metamorphism); (2) organic matter decay (including thermal maturation); (3) methane and/or ammonia decomposition during metamorphism; and (4) deep Earth degassing.

Conversely, residual soils showed higher G s values due to the presence of ferrous minerals such as goethite and hematite in laterite (Azam, 2005), and gibbsite and hematite in bauxite (Newson et al., 2006); the higher G s (in comparison with sedimentary clays) of uranium tailings was attributed to the high amount of muscovite (Paul and Azam, 2013).

For the generation of coupling products butane and propane, the Arrhenius equation did not provide a satisfactory description of the data, likely owing to the complex reaction mechanisms associated with these products and/or diffusional mass transfer processes associated with the ferrous minerals likely responsible for these coupling reactions.

Most of the knob was obscured by artifacts resulting from beam hardening and the partial volume effect [12], possibly caused by ferrous minerals infilling the pore spaces in the knob, or because the knob was too large for the X-rays to penetrate uniformly.

Although the data set was too limited to determine a definitive correlation, the two soils with elevated ferrous mineral contents had elevated abiotic dechlorination rate constants, while the one soil with a low ferrous mineral content had a relatively low abiotic dechlorination rate constant.

A combination of x-ray diffraction (XRD), magnetic susceptibility, and ferrous mineral content were used to characterize each of the 3 natural soils tested in this study, and dechlorination at temperatures ranging from 20 to 55 °C were examined.

Especially, the spectra of ferrous mineral such as olivine = (Mg, Fe 2SiO4 and ferric mineral such as hematite = Fe2O3 show different wavelength dependence each other in the 0.9 to 1.0 εm region (see Fig. 8); it may be possible to discuss the redox state of Venus surface.

Bulk first-order dechlorination rate constants (kbulk), scaled to the soil:water ratio expected for in situ conditions, ranged from 2.0 × 10− 5 day− 1 at 20 °C, to 32 × 10− 5 day− 1 at 55 °C in the soil with the greatest ferrous mineral content.

In contrast, the two ferrous ions are the "substrate" in the ferritins, as these enzymes perform a ferroxidase reaction to generate an oxo/hydroxo diferric product, which is then released from the site and stored in a nanocage as a ferric mineral core.