2000
DOI: 10.1346/ccmn.2000.0480404
|View full text |Cite
|
Sign up to set email alerts
|

Quantitative Measurement of Paramagnetic Fe3+ in Kaolinite

Abstract: Abstract--A method is proposed to measure the absolute concentration of paramagnetic Fe 3+ ions in kaolinite from various geochemical environments using powder X-band electron paramagnetic resonance (EPR) data. An Fe3+-doped corundum sample is used as a concentration standard. The Fe 3+ signal is calibrated by calculating the powder EPR spectra of Fe 3+ ions in corundum and low-defect kaolinite. The paramagnetic Fe 3+ concentration in other samples is obtained by an extrapolation procedure. This study provides… Show more

Help me understand this report

Search citation statements

Order By: Relevance

Paper Sections

Select...
1
1
1

Citation Types

1
22
0

Year Published

2002
2002
2020
2020

Publication Types

Select...
5
3

Relationship

0
8

Authors

Journals

citations
Cited by 42 publications
(23 citation statements)
references
References 31 publications
1
22
0
Order By: Relevance
“…We used a Fe-humic sample (T3: 2.85 g kg À1 diluted Fe III ; Weber et al, 2006) and a high defect kaolinite (FBT2: 1.25 g kg À1 diluted Fe III ; Balan et al, 2000), as standards to assess the concentration of diluted Fe III in organic and mineral phases, Fe III OM and Fe III K , respectively.…”
Section: Methodsmentioning
confidence: 99%
See 1 more Smart Citation
“…We used a Fe-humic sample (T3: 2.85 g kg À1 diluted Fe III ; Weber et al, 2006) and a high defect kaolinite (FBT2: 1.25 g kg À1 diluted Fe III ; Balan et al, 2000), as standards to assess the concentration of diluted Fe III in organic and mineral phases, Fe III OM and Fe III K , respectively.…”
Section: Methodsmentioning
confidence: 99%
“…Distinct generations of kaolinites (Balan et al, 2007) and Fe-oxides (Fritsch et al, 2005) have been distinguished in lateritic profiles, underlying changes in weathering conditions. Molecular scale approaches also provide a direct assessment of diluted Fe III in kaolinites (Balan et al, 2000) or bound to organic complexes , and reveal the control of metallic ions on free radical concentration in humic acid-metal complexes (Jerzykiewicz et al, 2002).…”
Section: Introductionmentioning
confidence: 99%
“…17 The resonance line with g = 9.0 results from the so called 12Y, 1 ® 2 transition, between the energy levels 1 and 2, m s = -5/2 to m s = -3/2, in the y axis direction. The three lines with g-values of 5.0, 3.5 and 2.8 arise from the angular dependence of the spin transition inside the central doublet, m s = -1/2 (3) to m s = + ½ (4).…”
mentioning
confidence: 99%
“…Those lines are due to absorptions of Fe 3+ in both Fe (I) and Fe (II) sites of kaolinites resulting from spin resonance arising from the three Kramer's doublets, whose energies are separated by crystal fields of rhombic symmetry. 17 Fe (I) and Fe (II) are two unequivalent crystal sites which Fe +3 can occupy in the octahedra in kaolinite.…”
mentioning
confidence: 99%
“…Phosphate uptake was pH dependent with adsorption mechanisms on kaolinite and iron oxide surfaces dominant generally below pH 7 and precipitation by calcium ions dominant above pH 7. Maximum phosphate removal occurred at high pH values of 11.22 (97.1% Obviously, the presence of substituents alters the particle size and crystallinity and consequently the ionic adsorption capacity of the kaolinite (Balan et al 2000).…”
Section: Reactivity Of the Kaolinite (Cui And Weng 2013)mentioning
confidence: 99%