Implications of natural organic matter binding heterogeneity on understanding lead(II) complexation in aquatic systems

Town, Raewyn M.; Filella, Montserrat

doi:10.1016/s0048-9697(01)01065-8

Cited by 50 publications

(43 citation statements)

References 122 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…1 These findings seem consistent with a pattern common to several metal ions: the natural organic matter is more likely to provide continuous binding sites than different discrete ligands. Accordingly, stronger binding sites are utilized at lower metal ion loadings and only progressively weaker sites contribute to metal complexation at higher loadings.…”

Section: Introductionsupporting

confidence: 74%

“…Accordingly, stronger binding sites are utilized at lower metal ion loadings and only progressively weaker sites contribute to metal complexation at higher loadings. 1 The resin titration (RT) is a method developed in our laboratory 2,3 to investigate the speciation of metal ions at trace level in complex matrices. It is a competition method, in which the competing agent is a complexing resin.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Determination of the Total Concentration and Speciation of Metal Ions in River, Estuarine and Seawater Samples

2008

View full text Add to dashboard Cite

Different natural water samples were investigated to determine the total concentration and the distribution of species for Cu(II), Pb(II), Al(III) and U(VI). The proposed method, named resin titration (RT), was developed in our laboratory to investigate the distribution of species for metal ions in complex matrices. It is a competition method, in which a complexing resin competes with natural ligands present in the sample to combine with the metal ions. In the present paper, river, estuarine and seawater samples, collected during a cruise in Adriatic Sea, were investigated. For each sample, two RTs were performed, using different complexing resins: the iminodiacetic Chelex 100 and the carboxylic Amberlite CG50. In this way, it was possible to detect different class of ligands. Satisfactory results have been obtained and are commented on critically. They were summarized by principal component analysis (PCA) and the correlations with physicochemical parameters allowed one to follow the evolution of the metals along the considered transect. It should be pointed out that, according to our findings, the ligands responsible for metal ions complexation are not the major components of the water system, since they form considerably weaker complexes.

show abstract

Section: Introductionsupporting

confidence: 74%

Section: Introductionmentioning

confidence: 99%

Determination of the Total Concentration and Speciation of Metal Ions in River, Estuarine and Seawater Samples

2008

View full text Add to dashboard Cite

show abstract

“…Chromium (III) is usually rapidly removed from the water column and supersaturation with respect to chromium solid phases is expected only in zones directly impacted by, e.g., tannery wastewaters (Koukal et al 2004). Furthermore, the influence of ligands such as sulfides and organic matter, which are absent in ISO medium but occur in natural environments (Rozan et al 2000;Town and Filella 2002), should also be considered. In any case, given the plans to replace Cr(VI) by Cr(III) in electroplating processes (Baral et al 2006), more detailed studies on the possible chronic effects of Cr(III) in standard media and/or environmental matrices at concentrations not exceeding its solubility probably deserve some priority in future research and risk assessment.…”

Section: Resultsmentioning

confidence: 99%

Temporal Decrease of Trivalent Chromium Concentration in a Standardized Algal Culture Medium: Experimental Results and Implications for Toxicity Evaluation

Vignati

Beye

Dominik

et al. 2008

Bull Environ Contam Toxicol

Self Cite

View full text Add to dashboard Cite

The fate of two trivalent chromium salts (nitrate and chloride) in ISO algal culture medium was followed over 72 h; i.e., the typical duration of algal toxicity tests. Fifty percent of the initial Cr spikes was lost from the solutions by 24 h, with losses up to 90% after 72 h. Monitoring of the temporal variability of Cr(III) concentrations in algal culture media appears necessary to better characterize the toxicity of trivalent chromium to algae.

show abstract

“…[16][17][18][19] Acidic polysaccharides, which are intermittently biologically produced by algae and bacteria, represent an important portion of the COM pool. They can constitute up to 25% of the natural organic matter in freshwaters, [20] especially during algal blooms, [8,21] and as much as 10-50% of the organic carbon in seawaters. [22,23] It has been found that acidic polysaccharides play an important role in the aggregation and sedimentation of organic matter in seawater [9] and consequently also affect trace element cycling.…”

Section: Introductionmentioning

confidence: 99%

Asymmetrical Flow Field Flow Fractionation - Multidetection System as a Tool for Studying Metal - Alginate Interactions

Alasonati

Stolpe²,

Benincasa³

et al. 2006

Environ. Chem.

View full text Add to dashboard Cite

Abstract. The present study explores the potential use of asymmetrical flow field flow fractionation (aFlFFF) with a multidetection system for the study of metal-alginate interactions. aFlFFF, coupled on-line to a differential refractive index and seven angle laser light scattering detectors was used to provide information on the alginate size distributions. In parallel, the metal distributions of metal-alginate complexes were probed by aFlFFF-high resolution inductively coupled plasma-mass spectrometry. Average values and continuous distributions of molar masses, radiuses of gyration and hydrodynamic radiuses, which are critical for understanding the role of alginates as carriers of metal pollutants, were evaluated in presence of Pb or Cd and compared with those in metal-free solutions of alginate. The values of number average and weight average molar mass, weight average radius of gyration and shape factor for alginate were 150 and 188 kg mol −1 , 53 nm and 1.7, respectively. Alginate molar mass and radius of gyration distributions were slightly shifted to higher values by the addition of micromolar concentrations of Pb or Cd. The alginate size distribution in the presence of Cd was similar to the alginate-alone control, whereas in the presence of Pb the size distribution was broader with a shift of the maximum toward higher molar masses.

show abstract

Implications of natural organic matter binding heterogeneity on understanding lead(II) complexation in aquatic systems

Cited by 50 publications

References 122 publications

Determination of the Total Concentration and Speciation of Metal Ions in River, Estuarine and Seawater Samples

Determination of the Total Concentration and Speciation of Metal Ions in River, Estuarine and Seawater Samples

Temporal Decrease of Trivalent Chromium Concentration in a Standardized Algal Culture Medium: Experimental Results and Implications for Toxicity Evaluation

Asymmetrical Flow Field Flow Fractionation - Multidetection System as a Tool for Studying Metal - Alginate Interactions

Contact Info

Product

Resources

About