Relationships between electrical properties and petrography of El-Maghara sandstone formations, Egypt

Kassab, Mohamed A.; Gomaa, Mohamed M.; Lala, Amir Maher Sayed

doi:10.1016/j.nrjag.2017.01.002

Cited by 10 publications

(3 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Generally, semicircles mean that there is DC in addition to the AC conduction of the conductivity ( Kassab et al., 2017 ). Arcs decrease in size to be a fraction of semicircle due to the increase of conductor minerals ( Gomaa and Abou El-Anwar, 2019 ).…”

Section: Discussion Of Electrical Characteristicsmentioning

confidence: 99%

Geochemical and electrical characterization of heavy metals in contaminated soils

Gomaa

Melegy

Metwaly

et al. 2020

Heliyon

Self Cite

View full text Add to dashboard Cite

The present work is conducted in the industrial district south of greater Cairo (ElTabbin area). Some heavy metals like Mn, Co, Ni, Cu, Zn, Pb, Cr, Ba, Cd, Mo were determined in polluted soils during May, 2018. At the study area, results displayed that average heavy metals concentrations differ considerably. They are decreased from Mn to Cd (Mn > Ba > Zn > Cr > Ni > Co > Pb > Cu > Mo > Cd). The average ranges as follows: Mn (255.8–31448.2 ppm); Ba (145.2–17545.6 ppm); Zn (53.3–1589.9 ppm); Cr (26.7–311.3 ppm); Ni (29.7–114.1 ppm); Co (13.2–39.8 ppm); Pb (5.7–77.4 ppm); Cu (7.6–35.2 ppm); Mo (0.1–15.9 ppm) and Cd (0–1.5 ppm), respectively. ElTabbin area has heavy manufacturing activity at Egypt. ElTabbin area was chosen as a model for that contamination. Electrical characteristics of some specimens from El- Tebbin area, Egypt, were taken and measured electrically at frequency range (10 −3 to 100 kHz). Major and heavy elements were measured at specimens. Specimens were classified to three categories according to electrical properties. The changes were the consequence of change in minor and major mineral composition in the specimens. Electrical properties were able to recognize different specimens according to different levels of contaminants in the specimens. Texture, tortuosity and minor elements of heavy elements are the controlling factors that control electrical properties at specimens. High values concentration of Mn, Ni, and Zn heavy elements increases conductivity while the high concentration of Pb and Cu heavy elements decreases the conductivity. The mixing up of these different minor and major minerals and elements at specimen may lead to the change of conductivity values. The main controlling factors of the major elements are the Fe 2 O 3 and SiO 2 , while the main controlling factors of the minor elements are the Mn and Pb. Our main objective is to study mixing up of the different minor and major minerals and elements on electrical properties of rocks.

show abstract

Section: Discussion Of Electrical Characteristicsmentioning

confidence: 99%

Geochemical and electrical characterization of heavy metals in contaminated soils

Gomaa

Melegy

Metwaly

et al. 2020

Heliyon

Self Cite

View full text Add to dashboard Cite

show abstract

“…The equivalent circuit of impedance is presented in Figure 17, representing the attitude of specimens (Macdonald 1974;Kassab et al 2017). Here, C g and R 1 represent the bulk features of the bulk material (arc 3 in the impedance plane Figure 15(b)), i.e.…”

Section: Electrical Features Of Kaolinite Under Pressurementioning

confidence: 99%

Kaolinite under pressure at audio frequency range and its electrical features

Gomaa

2020

NRIAG Journal of Astronomy and Geophysics

View full text Add to dashboard Cite

Electrical features of a humid kaolinite specimens was measured at various pressures and at various frequencies. Surface impedance is supposed on kaolinite particle surfaces (from humidity), chemical reaction and charge transport along surface hydroxyls of kaolinite edges besides the permanent negative charges. Classic mixture laws do not support the interpretation of electrical properties, especially, at high pressures. Accordingly, interpretation was made with percolation threshold theories. Pressure increase causes decrease in pore spaces and accordingly increases possible connections of pore distances filled with humidity to total pore spaces after applying pressure. With pressure increase, the pore voids between particles decrease and water conducting paths increase. Also, dielectric constant and conductance increase with increase of pressure. On the other hand, at a certain pressure, at low frequencies, a noticeable increase of capacitance with pressure increase, that tends to reach constant value, for relatively high pressures. The diffusion and interfacial mechanisms was suggested to interpret samples with increase of pressure and frequency. The latter mechanism acts simultaneously with surface chemical reaction mechanism (Debye behavior) to give a depressed arc (relaxation time distribution). Finally, the pressure and frequency are effective factors on electrical properties.

show abstract

“…Conductivity, in general, has a monotonic attitude of increase with the successive increase of frequency. The permittivity, in general, has a tendency to increase with decrease of the frequency (Kassab et al 2017, Gomaa 2006.…”

Section: Introductionmentioning

confidence: 99%

Electrical properties speculation of contamination by water and gasoline on sand and clay composite

2019

Self Cite

View full text Add to dashboard Cite

Effects of temperature, frequency, and molarity on electrical conductivity have been studied for sand-clay samples contaminated by water and gasoline.Electrical properties changes according to frequency, contaminant type and structure of components at the sample. A comparison was performed for these contaminated sand-clay samples. Changes of dielectric constant (∈′), conductivity (𝜎) and complex impedance with frequency ( 0.1 Hz 7 contaminant gasoline, the sample conductivity decreases. The permittivity, decreases with reduction of conductive links between grains and with the progressive increase of frequency. The conduction of electrical conductivity, commonly, increases with increase of connectivity between different links between grains. Also, conduction increases with progressive increase of frequency. Comparison of both outcomes from lab electrical measurements gives a speculation about the picture in the field.

show abstract

Relationships between electrical properties and petrography of El-Maghara sandstone formations, Egypt

Cited by 10 publications

References 26 publications

Geochemical and electrical characterization of heavy metals in contaminated soils

Geochemical and electrical characterization of heavy metals in contaminated soils

Kaolinite under pressure at audio frequency range and its electrical features

Electrical properties speculation of contamination by water and gasoline on sand and clay composite

Contact Info

Product

Resources

About