Ion binding to natural organic matter: competition, heterogeneity, stoichiometry and thermodynamic consistency

Kinniburgh, D.G.; Riemsdijk, W.H. van; Koopal, L.K.; Borkovec, Michal; Benedetti, Marc F.; Avena, Marcelo Javier

doi:10.1016/s0927-7757(98)00637-2

Cited by 756 publications

(797 citation statements)

References 36 publications

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“…29 The master curve obtained in this manner is free from electrostatic contributions. It was analyzed to obtain a distribution of intrinsic proton affinity constants using the NICA 21 isotherm that was incorporated into the Fit software. 30 The NICA approach takes into account both molecular heterogeneity and competition between H + and Cd 2+ or Pb 2+…”

Section: Methodsmentioning

confidence: 99%

Quantifying Pb and Cd Complexation by Alginates and the Role of Metal Binding on Macromolecular Aggregation

et al. 2005

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The Pb and Cd binding capacity of alginates were quantified by the determination of their complex stability constants and the concentration of complexing sites using H + , Pb 2+ , or Cd 2+ selective electrodes in both static and dynamic titrations. Centrifugation filter devices (30 kDa filter cutoff), followed by inductively coupled plasma mass spectrometry (ICP-MS) measurements of lead or cadmium in the filtrates, were used to validate the results. The influence of ionic strength, pH, and the metal-to-alginate ratio was determined for a wide range of metal concentrations. Because of their polyelectrolytic properties, alginates may adopt different conformations depending on the physicochemistry of the medium, including the presence of metals. Therefore, molecular diffusion coefficients of the alginate were determined by fluorescence correlation spectroscopy under the same conditions of pH, ionic strength, and metal-to-alginate ratios that were used for the metal binding studies. The complexation and conformational properties of the alginate were related within the framework of the nonideal competitive adsorption isotherm (NICA) combined with a Donnan approach to account for both intrinsic and electrostatic contributions.

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Section: Methodsmentioning

confidence: 99%

Quantifying Pb and Cd Complexation by Alginates and the Role of Metal Binding on Macromolecular Aggregation

et al. 2005

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“…Tipping, 1998;Kinniburgh et al, 1999;Dudal and Gérard, 2004;Lenoble et al, 2008). In this study, to calculate Fe(II) speciation, and particularly its interactions with the dissolved organic matter, the WinHumicV (Gustafsson, 1999) model has been used.…”

Section: Fe(ii) Speciation Modellingmentioning

confidence: 99%

Strong chemical evidence for high Fe(II)-colloids and low As-bearing colloids (200nm–10kDa) contents in groundwater and flooded paddy fields in Bangladesh: A size fractionation approach

Garnier

Hurel

Garnier

et al. 2011

Applied Geochemistry

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“…Davies jednadžba pri 25°C). Organska kompleksacija Cd je izvedena pomoću inkorporiranog NICA-Donnan (sub)modela (Kinniburgh et al 1999), kao jednim od najnaprednijih modela za kompetitivno kompleksiranje Cd s otopljenim visoko-molekularnim organskim supstancama bogatim aktivnim radikalima, ili takozvanim otopljenim organskim ugljikovim kompleksima (DOC) (Weng et al 2001). U sva tri modela je pretpostavljena konstantna koncentracija DOC od 1 mg/L, a što se vrlo dobro podudara sa organski osiromašenim saliniziranim vodnim (površinskim/podzemnim) resursima koji se koriste za navodnjavanje poljoprivrednih kultura u delti Neretve (Ondrasek et al, 2011).…”

Section: Materijal I Metode Radaunclassified

Procjena specijacije kadmija u saliniziranim okolišnim uvjetima

et al. 2012

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SažetakPovećanje saliniteta i sadržaja elemenata u tragovima u površini tla putem neodgovarajućih praksi gospodarenja zemljištem (fertirigacija, aplikacija kondicionera tla) predstavlja jednu od najraširenijih prijetnji sigurnosti i zaštiti hrane u suvremenoj poljoprivredi. Fitodepozicija, kao najznačajniji način unosa biotoksičnog i neesencijalnog kadmija (Cd) u ljudske namirnice, korespondira pozitivno sa salinitetom rizosfere. Pomoću kemijsko specijacijskog računalnog pristupa (Visual MINTEQ) procijenjen je biogeokemizam Cd-kontaminirane (1µM) otopine s različitim razinama (nizak-visok) jednih od najzastupljenijih prirodnih minerala (Na + 15-150, Cl -12-90 i SO 4 2-1.5-30 mM) u širokom pH (3.5-9.5) rasponu i niskom prisustvu otopljenog organskog ugljika (1 mg DOC/L). Na temelju modeliranih rezultata, koncentracija slobodnog Cd 2+ je dominirala u većini testiranog pH raspona kod niskog saliniteta, dok su u okruženju srednjeg do visokog saliniteta prevladavale koncentracije Cd-Cl-i Cd-SO 4 -kompleksiranog sadržaja Cd. NICADonnan modeliranjem je potvrđena važnost Cd-organo-kompleksiranog sadržaja jedino pri višim pH vrijednostima (>8.0) i nižem salinitetu. Rezultati potvrđuju da kao posljedica smanjenog otopljenog organskog sadržaja uslijed povećanog saliniteta (npr. prirodno salinizirana tla, vode korištene za navodnjavanje u poljoprivredi) biogeokemizam Cd u rizosferi može pospješiti mobilnost Cd, a time i njegovu fitoekstrakciju od strane navodnjavanih kultura.Ključne riječi: salinitet rizosfere, elementi u tragovima, geokemijsko modeliranje Uvod Zaslanjivanje ili salinizacija prirodnih zemljišnih i/ili vodnih resursa korištenih u poljoprivrednoj proizvodnji predstavlja jedan od najbrže rastućih problema u održivoj proizvodnji hrane (Ondrasek et al., 2011). Salinizacija obradivih površina može biti

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Ion binding to natural organic matter: competition, heterogeneity, stoichiometry and thermodynamic consistency

Cited by 756 publications

References 36 publications

Quantifying Pb and Cd Complexation by Alginates and the Role of Metal Binding on Macromolecular Aggregation

Quantifying Pb and Cd Complexation by Alginates and the Role of Metal Binding on Macromolecular Aggregation

Strong chemical evidence for high Fe(II)-colloids and low As-bearing colloids (200nm–10kDa) contents in groundwater and flooded paddy fields in Bangladesh: A size fractionation approach

Procjena specijacije kadmija u saliniziranim okolišnim uvjetima

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