On the Problems of Total Specific Surface Area and Cation Exchange Capacity Measurements in Organic-Rich Sedimentary Rocks

Derkowski, Arkadiusz; Bristow, T. F.

doi:10.1346/ccmn.2012.0600402

Cited by 39 publications

(23 citation statements)

References 63 publications

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“…Few published works have considered the CEC/specific surface area measurements in oil or gas mudrocks. In that context, Derkowski and Bristow (2012) address the important question of whether sedimentary organic matter (mostly kerogen) in oil and gas mudrocks exhibits similar properties to those of organic matter found in soils. Indeed, during burial, organic matter has been subjected to pressure and temperature changes and these changes can alter the original properties.…”

Section: Influence Of Organic Matter and Kerogen Content On Complex Cmentioning

confidence: 99%

Complex conductivity tensor of anisotropic hydrocarbon-bearing shales and mudrocks

et al. 2013

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A model was recently introduced to describe the complex electrical conductivity and high-frequency dielectric constant of isotropic clayey porous materials. We generalized that approach to the case of anisotropic and tight hydrocarbon-bearing shales and mudrocks by introducing tensorial versions of formation factor and tortuosity. In-phase and quadrature conductivity tensors have common eigenvectors, but the eigenvectors of the dielectric tensor may be different due to influence of the solid phase at high frequencies. In-phase and quadrature contributions to complex electrical conductivity depend on saturation, salinity, porosity, temperature, and cation exchange capacity (alternatively, specific surface area) of the porous material. Kerogen is likely to have a negligible contribution to the cation exchange capacity of the material because all exchangeable sites in the functional groups of organic matter may have been polymerized during diagenesis. An anisotropic experiment is performed to validate some of the properties described by the proposed model, especially to verify that the electrical anisotropy factor is the same for in-phase and quadrature conductivities. We used two samples from the Bakken formation. Experimental data confirm the validity of the model. Also, the range of values for cation exchange capacity determined when implementing the new model with experimental data agree with the known range of cation exchange capacity for the Bakken shale. Measurements indicate that the bulk-space tortuosity in the direction normal to bedding plane can be higher than 100.

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Section: Influence Of Organic Matter and Kerogen Content On Complex Cmentioning

confidence: 99%

Complex conductivity tensor of anisotropic hydrocarbon-bearing shales and mudrocks

et al. 2013

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“…The concentration of carboxyl groups from the acetate was set to correspond to the concentration of Cl anions. In neither tested sample did the addition of the acetate changed the CEC hexCo beyond the CEC measurement error (0.014 meq/g; Derkowski and Bristow, 2012).…”

Section: Resultsmentioning

confidence: 94%

“…Because the content and structure of clay minerals determine the bulk rock CEC in an average shale, evaluating the features of these minerals enables calculation of theoretical CEC (cf. Środoń, 2009;Derkowski and Bristow, 2012;Derkowski and Marynowski, 2016). The maximum conservative values contributed by the clay minerals to the bulk rock CEC (CEC Theor(clay) ) are 0.10 meq/g in the unweathered Hangenberg shale and 0.20 meq/g in the Tournaisian shale.…”

Section: Apparent Cecmentioning

confidence: 99%

Binding of heavy metals by oxidised kerogen in (palaeo)weathered black shales

Derkowski

Marynowski

2018

Chemical Geology

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Citation style: Derkowski Arkadiusz, Marynowski Leszek. (2018). Binding of heavy metals by oxidised kerogen in (palaeo)weathered black shales. A B S T R A C TSub-aerial weathering of black shales drives the gradual leaching of sulphur-and organic-bound heavy metal elements, which are usually abundant in these rocks due to depositional conditions. The formation of oxygen functional groups in kerogen, however, can lead to an opposing mechanism -metal adsorption and binding, similar to a process common in soils. An increase in cation exchange capacity (CEC) measured previously using metal complexes on black shales oxidised under laboratory conditions implies that the same phenomenon may occur in a naturally oxidised black shale. This idea was tested on a unique, well-developed and -preserved Permian palaeoweathering profile containing two neighbouring but diverse black shales from the Devonian/ Carboniferous boundary in the Holy Cross Mountains (Poland).In the studied black shale beds, the oxygen groups formed in kerogen in the partially-weathered zone were found to be responsible for significant changes in adsorption properties measured using hexamminecobalt(III) and Cu(II)-triethylenetetramine cations, which are common probes for CEC. Compared to a pristine part of black shales, the partially weathered zone was depleted of total organic carbon (TOC), sulphur, and sulphur-and organic-bound metals, and highly enriched in Cu, which is generally present in low levels in the nascent shales.In the partially weathered zone, where TOC content is reduced, apparent CEC values surpass the CECs predicted from the contents and structures of clay minerals, and correlate linearly with the content of oxygen groups developed during weathering. The adsorption properties of carboxyl groups in the oxidised kerogen are suggested as being responsible for the syn-or post-weathering enrichment in Cu caused by the remobilisation of older Cu-sulphide ores present in the area. As opposed to natural weathering, aggressive oxidation, e.g. under laboratory conditions produces a high proportion of cross-linked oxygen groups that do not participate in metal cation adsorption. The CEC values of artificially oxidised samples reached a limit corresponding to those of naturally oxidised shales.Editor: Michael E. Böttcher exchange capacity (CEC) of soils (Parfitt et al., 1995;Kaiser et al., 2008;Rengasamy and Churchman, 1999) and oxidised low-rank coals (Skodras et al., 2014). In extreme cases, it is the oxidised black carbon formed via incomplete combustion of vegetation or fossil fuels that is responsible for high CEC levels in soils (Liang et al., 2006;Cheng et al., https://doi.

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“…The sample was rinsed with deionized water and decanted until the chloride test result was negative, dried and calcinated in air for 12 h at 370 C. Untreated montmorillonite and intercalated calcined samples were dispersed (separately) and 25 cm 3 of 0.01496 mol/dm 3 hexamminecobalt (III) chloride was added. Suspension was shaken for 2 h and filtrated (Derkowski and Bristow, 2012) …”

Section: Preparation Of Samplesmentioning

confidence: 99%

Selective catalytic reduction of NO with NH₃ on mixed alumina–iron (III) oxide pillared montmorillonite “Cheto” Arizona, modified with hexamminecobalt (III) chloride

Ziemiański

Kałahurska

Samojeden

2017

Adsorption Science & Technology

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Montmorillonite intercalated with mixed alumina-iron (III) oxide pillars and promoted with hexamminecobalt (III) chloride was studied in selective catalytic reduction of NO with NH 3 . Pillaring process extended the interlayer spacing by 0.236 nm and increased specific surface area (SSA BET , without pillaring, showed no selective catalytic reduction activity, but still produced high amounts of N 2 O.

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On the Problems of Total Specific Surface Area and Cation Exchange Capacity Measurements in Organic-Rich Sedimentary Rocks

Cited by 39 publications

References 63 publications

Complex conductivity tensor of anisotropic hydrocarbon-bearing shales and mudrocks

Complex conductivity tensor of anisotropic hydrocarbon-bearing shales and mudrocks

Binding of heavy metals by oxidised kerogen in (palaeo)weathered black shales

Selective catalytic reduction of NO with NH₃ on mixed alumina–iron (III) oxide pillared montmorillonite “Cheto” Arizona, modified with hexamminecobalt (III) chloride

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On the Problems of Total Specific Surface Area and Cation Exchange Capacity Measurements in Organic-Rich Sedimentary Rocks

Cited by 39 publications

References 63 publications

Complex conductivity tensor of anisotropic hydrocarbon-bearing shales and mudrocks

Complex conductivity tensor of anisotropic hydrocarbon-bearing shales and mudrocks

Binding of heavy metals by oxidised kerogen in (palaeo)weathered black shales

Selective catalytic reduction of NO with NH3 on mixed alumina–iron (III) oxide pillared montmorillonite “Cheto” Arizona, modified with hexamminecobalt (III) chloride

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Selective catalytic reduction of NO with NH₃ on mixed alumina–iron (III) oxide pillared montmorillonite “Cheto” Arizona, modified with hexamminecobalt (III) chloride