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Understanding the bioavailability and sequestration of different metal cations in the presence of a biodegradable chelant S,S-EDDS in biological fluids and natural waters
- Source :
- Chemosphere. 150:341-356
- Publication Year :
- 2016
- Publisher :
- Elsevier BV, 2016.
-
Abstract
- Ethylenediamine-N,N'-disuccinic acid is a biodegradable alternative to EDTA, therefore its use for the sequestration of Ca(2+), Sn(2+), Cu(2+), Zn(2+) and Fe(3+) is analyzed. New data on its binding ability towards these cations were obtained with potentiometric, voltammetric and calorimetric measurements at different ionic strengths and at T = 298.15 K. Real multi-component fluids, namely fresh water, urine, sea water, saliva and blood plasma were chosen as case studies to evaluate the sequestering ability of EDDS in comparison with EDTA. Speciation diagrams were drawn in selected conditions, considering all interactions among the "natural" components of the fluid and those studied in this work, EDDS and EDTA (cL = 1 mmol dm(-3)) as sequestering agents and the cited metal cations (cM ∼ 10(-5) mol dm(-3)). The comparison of the sequestering ability of EDDS and EDTA is done using pM and pL0.5. In blood plasma the plasma mobilizing index was adopted. It was found that EDDS is a good alternative to EDTA, which tends to bind Ca(2+) and Mg(2+) more than EDDS. In particular, EDTA cannot be used as a sequestrant for Sn(2+) when cCa > cEDTA. EDDS is more efficient than EDTA at pH < 8, particularly in urine, where carbonate is absent. In sea water, the sequestering ability of EDDS towards Fe(3+) is higher than that of EDTA. In blood plasma, the PMI of EDDS towards Cu(2+) is higher than that of EDTA. Thermodynamic information, in terms of ΔH and ΔS, for the protonation and metal complex formation reactions are reported.
- Subjects :
- Environmental Engineering
Health, Toxicology and Mutagenesis
Sodium
Biological Availability
Salt (chemistry)
chemistry.chemical_element
010501 environmental sciences
010402 general chemistry
01 natural sciences
Chemistry Techniques, Analytical
Metal
chemistry.chemical_compound
EDDS
Rivers
Cations
Metals, Heavy
Humans
Environmental Chemistry
Seawater
Qualitative inorganic analysis
Chelation
Saliva
Edetic Acid
0105 earth and related environmental sciences
chemistry.chemical_classification
Chemistry
Osmolar Concentration
Public Health, Environmental and Occupational Health
Chelation, S,S EDDS, Heavy metals, Speciation, Case studies, Plasma mobilizing index
Succinates
General Medicine
General Chemistry
Ethylenediamines
Pollution
0104 chemical sciences
body regions
Environmental chemistry
visual_art
Sequestrant
visual_art.visual_art_medium
Thermodynamics
Environmental Pollutants
Titration
Nuclear chemistry
Subjects
Details
- ISSN :
- 00456535
- Volume :
- 150
- Database :
- OpenAIRE
- Journal :
- Chemosphere
- Accession number :
- edsair.doi.dedup.....5b6bd98e4fc5888f10a14f92f164b73c