Analytical determination of apparent stability constants using a copper ion selective electrode

Byrne, Laurann; Hynes, Michael J.; Connolly, Cathal; Murphy, Richard

doi:10.1016/j.jinorgbio.2011.07.016

Cited by 16 publications

(5 citation statements)

References 24 publications

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“…Several parameters have to be taken into account before titration of the metal complex. For example, the protonation constants (pK a values) of the ligand must be known and the concentrations of the free ligands and metal ions need to be determined. In addition, temperature control, inert atmosphere, and inert background electrolyte are also needed during determination procedures .…”

Section: Introductionmentioning

confidence: 99%

Determination of conditional stability constants for some divalent transition metal ion‐EDTA complexes by electrospray ionization mass spectrometry

et al. 2014

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Conditional stability constants of coordination complexes comprising divalent transition metals, Cu(2+), Ni(2+), Zn(2+), Co(2+), and ethylenediaminetetraacetic acid (EDTA) were determined utilizing electrospray ionization mass spectrometry. The deviation of signal response of a reference complex was monitored at addition of a second metal ion. The conditional stability constant for the competing metal was then determined through solution equilibria equations. The method showed to be applicable to a system where Co(2+) and Zn(2+) competed for EDTA at pH 5. When Cu(2+) and Ni(2+) competed for EDTA, the equilibrium changed over time. This change was shown to be affected in rate and size by the type of organic solvent added. In this work, 30% of either methanol or acetonitrile was used. It was found that if calibration curves are prepared for both metal complexes in solution and the measurements are repeated with sufficient time space, any change in equilibrium of sample solutions will be discovered.

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Section: Introductionmentioning

confidence: 99%

Determination of conditional stability constants for some divalent transition metal ion‐EDTA complexes by electrospray ionization mass spectrometry

et al. 2014

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“…Metal ion complex formation with its natural ability of metal complexation is of unexplored potential for landfill coverage in future. The strength of the interaction among organic ligands and metals may be modeled as a function of pH and reactant concentration (Byrne et al, 2011) and experimentally proves usefulness of natural clays and HS as remediation amendment for contaminated soils in dumps.…”

Section: Metal Complexation and Its Potential In Remedial Processesmentioning

confidence: 91%

Clay minerals and humic substances as landfill closure covering material constituents: first studies

Burlakovs¹,

Pilecka-Ulcugaceva²,

Grīnfelde³

et al. 2020

Research for Rural Development

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Soil and groundwater as the leachate may contaminate surrounding watersheds, thus different pollutants from closed dumps and landfills pose significant risks to human health and ecology. Pollution may lead to soil and water degradation however it might be diminished through sustainable dump site closure projects and processual management. Several decades of clays and clay minerals studies lead to modified clay composites concept that is one of the potential promising solutions for building the landfill covering material and serve as capping biocover layer at the same time. As humic substances are constituents of soil organic matter, pollutants can be sorbed on the surfaces of complex molecules. This kind of humic acid-clay mineral composite materials thus might become as low cost building material component - covering material. Construction of such layer are to be performed as a combination of clay-humic composites and landfill mined fine fraction of waste with small amendment of natural soil. Several hypotheses that are already proven has to be mentioned: a) Clay minerals produce composites with humic substances; 2) Clay-humic complexes reduce through sorption both organic and inorganic pollutants; 3) Low risk of toxic byproducts from landfill mined waste fine fraction can be the problem; 4) Such composites mostly would trap toxic contaminants (e.g., pharmaceuticals) found in reworked fine fraction of waste. The aim of the work is to provide alternative solution for landfill closure by giving theoretical considerations from multidisciplinary knowledge of environmental engineering, chemistry and waste management.

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“…In practical terms, simple changes in configuration of amino acids in this tripeptide result in a greater proportion of bound mineral relative to free mineral and ligands. Previous work assessed the effect of the positional substitution of histidine in the tripeptide sequence, in addition to longer chain peptide sequences, and factors such as folding and structural rearrangements (e.g., the formation of fused rings) can also contribute to enhanced stability [16,43]. Essentially, proteinate stability can be significantly influenced not only by the type of peptide used, but also the configuration of amino acids in a peptide sequence.…”

Section: Tripeptides Logβ ML 12mentioning

confidence: 99%

Influence of the Chelation Process on the Stability of Organic Trace Mineral Supplements Used in Animal Nutrition

Byrne

Hynes

Connolly

et al. 2021

Animals

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The effect of the chelation process on the pH-dependent stability of organic trace minerals (OTMs) used as mineral supplements in animal nutrition was assessed using analytical techniques such as potentiometry, Fourier Transform Infrared Spectroscopy (FTIRS) and amino acid profiling. The aim was to understand the influence and relative importance of the manufacturing conditions on mineral chelation and the subsequent pH stability of OTMs. A selection of OTMs were assessed over a wide pH range to account for the typical environmental changes encountered in the gastrointestinal (GI) tract. In the case of proteinate type products, the potentiometric assessment of free mineral concentration indicated that the hydrolysis procedure used to generate the chelating peptides was the major influencer of the pH stability of the products. Many products are available under the umbrella term “OTMs”, including amino acid complexes, amino acid chelates, polysaccharide complexes and proteinates. Significant differences in the pH-dependent stability of a range of commercially available OTMs were observed.

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Analytical determination of apparent stability constants using a copper ion selective electrode

Cited by 16 publications

References 24 publications

Determination of conditional stability constants for some divalent transition metal ion‐EDTA complexes by electrospray ionization mass spectrometry

Determination of conditional stability constants for some divalent transition metal ion‐EDTA complexes by electrospray ionization mass spectrometry

Clay minerals and humic substances as landfill closure covering material constituents: first studies

Influence of the Chelation Process on the Stability of Organic Trace Mineral Supplements Used in Animal Nutrition

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