Komplexverbindungen und Salze der Äthylendiamintetraessigsäure

Brintzinger, H.; Thiele, Heinrich; Müller, Ursula

doi:10.1002/zaac.19432510308

Cited by 61 publications

(7 citation statements)

References 3 publications

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“…Some reports favor a structure with five bonds and the sixth metal position occupied by a water molecule, as proposed in the product [Cr(HY)(H 2 O)] formed in Eq. . Certainly, this structure agrees with the well‐known fact that the Cr(III)–EDTA complex presents two distinct acidity equilibrium constants, corresponding to the loss of hydrogen ions from the unbounded carboxyl group of the organic ligand HY 3− and from the metal‐bonded water molecule .…”

Section: Resultssupporting

confidence: 85%

Two Rate Constant Kinetic Model for the Chromium(III)–EDTA Complexation Reaction by Numerical Simulations

Perez‐Benito

2017

Int J of Chemical Kinetics

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The complexation reaction of Cr(III) ion in the presence of a large excess of ethylenediaminetetraacetic acid (EDTA) does not follow a pseudo–first‐order kinetics as sometimes suggested. There are two causes for the deviation from this simple behavior: the involvement of a long‐lived intermediate, precluding the application of the steady‐state approximation, and the autoinhibition provoked by the release of hydrogen ions from the organic ligand to the medium as the final Cr(III)–EDTA violet complex is formed. Numerical simulations have allowed obtaining for each kinetic experiment the values of two rate constants, k1 (corresponding to the formation of the long‐lived intermediate from the reactants) and k2 (corresponding to the formation of the final complex product from the long‐lived intermediate), as well as the number of hydrogens liberated per molecule of final complex product formed (Hkin). The results indicate that k1 is associated with a fast step (Ea = 87 ± 4 kJ mol−1) and k2 to a slow step (Ea = 120 ± 2 kJ mol−1), whereas the number of hydrogen ions lies within the range 0 < Hkin < 2 in all the kinetic runs. A mechanism in accordance with the experimental data has been proposed.

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Section: Resultssupporting

confidence: 85%

Two Rate Constant Kinetic Model for the Chromium(III)–EDTA Complexation Reaction by Numerical Simulations

Perez‐Benito

2017

Int J of Chemical Kinetics

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“…NH4Fe-[2-"4C]EDTA (0.86 mCi/mg) and NH4Fe-EDTA-[14C ]ethylene (0.60 mCi/mg) were synthesized from either EDTA-[2-4C Jacetate or EDTA-["CJethylene (Mallinckrodt Chemical Works, St. Louis) according to the procedure of Brintzinger et al (6). The resultant chemicals were recrystallized in acetone-water (4:1).…”

Section: Methodsmentioning

confidence: 99%

Degradation of Ethylenediaminetetraacetic Acid by Microbial Populations from an Aerated Lagoon

Belly

Lauff

Goodhue

1975

Applied Microbiology

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“…We were unable to prepare Fe-EDTA using the method described by Teeter & Owens (1983). However, we were able to prepare the ammonium salt of Fe-EDTA using the technique of Brintzinger, Thiele & Muller (1943). Each animal received 0.5 g of each complex.…”

Section: Digesta Markersmentioning

confidence: 99%

The passage of digesta, particle size, and in vitro fermentation rate in the three‐toed sloth Bradypus tridactylus (Edentata: Bradypodidae)

1995

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The digestive physiology of six three‐toed sloths (Bradypus tridactylus) fed exclusively on Cecropia palmata foliage was studied. The mass of digesta in the gut was between 17 and 37% of body mass. This was between 133 and 282% of that expected in an animal of this size, based on published allometric equations. The concentration of total short chain fatty acids in the stomach was similar to that in the fermentative regions of other foregut fermenting herbivores but the rate of fermentation measured in vitro was very slow (6–12 mmol.l‐1.h‐1) and substantially lower than that observed using similar techniques in other small foregut fermenters. The overall (dose to excretion) mean retention time of particulate and solute digesta markers was about 150 h. Most of this (73%) occurred in the stomach but a substantial proportion (17%) could be attributed to the storage of faeces in the rectum. The slow rate of passage of digesta through the gut together with the slow rate of fermentation in the stomach is not typical of small foregut fermenting herbivores. However, such a pattern is feasible in Bradypus tridactylus because of the large volume of digesta retained in the gut and the very low metabolic rate of these mammals.

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Komplexverbindungen und Salze der Äthylendiamintetraessigsäure

Abstract: Blei(II)‐ion gibt mit Äthylendiamintetraessigsäure ein Salz, in welchem die 4 Carboxylgruppen der Säure durch 2 Bleiionen gebunden sind.

Cited by 61 publications

References 3 publications

Two Rate Constant Kinetic Model for the Chromium(III)–EDTA Complexation Reaction by Numerical Simulations

Two Rate Constant Kinetic Model for the Chromium(III)–EDTA Complexation Reaction by Numerical Simulations

Degradation of Ethylenediaminetetraacetic Acid by Microbial Populations from an Aerated Lagoon

The passage of digesta, particle size, and in vitro fermentation rate in the three‐toed sloth Bradypus tridactylus (Edentata: Bradypodidae)

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