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(Table 1) Geochemical analysis on sediment core CRP-3 (2001)

Kettler, Richard M

PANGAEA

In: Supplement to: Kettler, Richard M (2001): Results of whole-rock organic geochemical analyses of the CRP-3 drillcore, Victoria Land Basin, Antarctica. Terra Antartica, 8(3), 303-308, hdl:10013/epic.28241.d001

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Publikationsdatum: 2024-04-27

Beschreibung: Sediments and rocks recovered in CRP-3 coring operations contain minute amounts of organic matter (average 0.3% TOC). TOC contents and C:N ratios are zoned systematically: those rocks encountered at depths greater than 330 meters below sea floor (mbsf) contain less organic matter and have higher TOC:N ratios (after correcting for inorganic N) than do shallower rocks. The only two samples that have TOC values greater than 1% also contain abundant granule to silt-sized particles of coal. The total sulphur contents of these rocks is very low and indicates either that only small amounts of deposited organic matter were labile, or that no source of reactive iron was present during diagenesis.

Schlagwort(e): Cape Roberts Project; Carbon, organic, total; Carbon, organic, total, standard deviation; Carbon, total; Carbon, total, standard deviation; Core wireline system; CRP; CRP-3; CWS; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; Element analyser CHNS-O, Carlo Erba EA1108; Nitrogen, standard deviation; Nitrogen, total; Ross Sea; Sampling/drilling from ice; Sulfur, standard deviation; Sulfur, total

Materialart: Dataset

Format: text/tab-separated-values, 638 data points

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Digitale Medien

Dissociation quotients of malonic acid in aqueous sodium chloride media to 100°C (1992)

Kettler, Richard M. ; Wesolowski, David J. ; Palmer, Donald A.

Springer

Journal of solution chemistry 21 (1992), S. 883-900

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ISSN: 1572-8927

Schlagwort(e): Malonic acid ; propanedioic acid ; dissociation constants ; thermodynamics ; potentiometry ; ionic strength

Quelle: Springer Online Journal Archives 1860-2000

Thema: Chemie und Pharmazie

Notizen: Abstract The first and second molal dissociation quotients of malonic acid were measured potentiometrically in a concentration cell fitted with hydrogen electrodes. The hydrogen ion molality of malonic acid/bimalonate solutions was measured relative to a standard aqueous HCl solution from 0 to 100°C over 25° intervals at five ionic strengths ranging from 0.1 to 5.0 molal (NaCl). The molal dissociation quotients and available literature data were treated in the all anionic form by a seven-term equation. This treatment yielded the following thermodynamic quantities for the first acid dissociation equilibrium at 25°C: logK 1a =-2.852±0.003, ΔH 1a /o =0.1±0.3 kJ-mol−1, ΔS 1a o =−54.4±1.0 J-mol−1-K−1, and ΔC p,1a o =−185±20 J-mol−1-K−1. Measurements of the bimalonate/malonate system were made over the same intervals of temperature and ionic strength. A similar regression of the present and previously published equilibrium quotients using a seven-term equation yielded the following values for the second acid dissociation equilibrium at 25°C: logK2a=−5.697±0.001, ΔH 2a o =−5.13±0.11 kJ-mol−1, ΔS 2a o =−126.3±0.4 J-mol−1-K−1, and ΔC p,2a o =−250+10 J-mol−1-K−1.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00651513

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Digitale Medien

Cadmium Malonate Complexation in Aqueous Sodium Trifluoromethanesulfonate Media to 75°C; Including Dissociation Quotients of Malonic Acid (1998)

Ridley, Moira K. ; Palmer, Donald A. ; Wesolowski, David J. ; [weitere]

Springer

Journal of solution chemistry 27 (1998), S. 195-216

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ISSN: 1572-8927

Schlagwort(e): Malonic acid ; propanedioic acid ; dissociation constants ; cadmium ; complexation constants ; sodium trifluoromethanesulfonate ; potentiometry

Quelle: Springer Online Journal Archives 1860-2000

Thema: Chemie und Pharmazie

Notizen: Abstract The molal formation quotients for cadmium–malonate complexes were measured potentiometrically from 5 to 75°C, at ionic strengths of 0.1, 0.3, 0.6 and 1.0 molal in aqueous sodium trifluoromethanesulfonate (NaTr) media. In addition, the stepwise dissociation quotients for malonic acid were measured in the same medium from 5 to 100°C, at ionic strengths of 0.1, 0.3, 0.6, and 1.0 molal by the same method. The dissociation quotients for malonic acid were modeled as a function of temperature and ionic strength with empirical equations formulated such that the equilibrium constants at infinite dilution were consistent, within the error estimates, with the malonic acid dissociation constants obtained in NaCl media. The equilibrium constants calculated for the dissociation of malonic acid at 25°C and infinite dilution are log K 1a=-2.86 ± 0.01 and log K 2a=-5.71 ± 0.01. A single Cd–malonate species, CdCH2C2O4, was identified from the complexation study and the formation quotients for this species were also modeled as a function of temperature and ionic strength. Thermodynamic parameters obtained by differentiating the equation with respect to temperature for the formation of CdCH2C2O4 at 25°C and infinite dilution are: K = 3.45 ± 0.09, ΔS° = 7 ± 6 kJ-mol-1, ΔS° = 91 ± 22 J-K--mol-1, and ΔC p o =400±300 JK-1mol-1.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1023/A:1022638817245

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