Effect of pH on the complexation parameters for organic matter dissolved in river water

Antelo, Juan; Arce, F.; Penedo, Francisco J.

doi:10.3184/095422900782775580

Cited by 8 publications

(3 citation statements)

References 10 publications

(9 reference statements)

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“…These variations were attributed to seasonal changes in river flow. The CCs of freshwater samples in Spain showed a small tendency to decrease in the months with the higher flow rates, 6,7 this was thought to be due to dilution. In seawater, it has been reported that concentrations of stronger ligands showed variability due to seasonal and spatial factors, whilst levels of ligands did not.…”

Section: Introductionmentioning

confidence: 96%

Temporal variation of copper and zinc complexation capacity in the Humber estuary

Veen

Gardner

Comber

2001

J. Environ. Monitor.

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The complexation capacity (CC) for zinc and copper in the Humber estuary was determined and compared with data obtained using the same procedures from previous years. The CC for both metals was found to be relatively stable over a time span of 4 years for zinc and 10 years for copper. Levels of CC ranged from, in the upper estuary, 400 nM (copper) and 150 nM (zinc) to between 25 and 50 nM for both metals in the lower estuary. The CC from freshwater inputs appears to be relatively conservative with simple dilution accounting for the decrease in CC as salinity increases. A seasonal effect for copper is suggested.

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Section: Introductionmentioning

confidence: 96%

Temporal variation of copper and zinc complexation capacity in the Humber estuary

Veen

Gardner

Comber

2001

J. Environ. Monitor.

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“…Generally, the potential for complex formation between metals and organics increases with pH alkalisation (Hummel et al, 2000). Farrah and Pickering (1997a) showed that the proportions of metal bound as hydroxyl complexes increase at pH 5 and above although the capacity for complexation shows no dependence on pH (Antelo et al, 2000). Instead the metal-organic interaction depends on the stability of complex formation and metal concentration.…”

Section: Chelation and Complexation With Organic Substancesmentioning

confidence: 99%

Recovering metal(loids) and rare earth elements from closed landfill sites without excavation: Leachate recirculation opportunities and challenges

et al. 2022

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“…A decrease in pH would change the chemical speciation of copper and the fraction of bioavailable species [20]. In the presence of natural organic matter, a reduced pH would increase the fraction of electrochemically active copper due to a reduced formation of copper-organic complexes [21].…”

Section: Chemical Speciation Of Released Coppermentioning

confidence: 99%

Release and chemical speciation of copper from anti‐fouling paints with different active copper compounds in artificial seawater

Sandberg¹,

Wallinder²,

Leygraf³

et al. 2007

Materials & Corrosion

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Release rates of total copper in artificial seawater (without organic matter) from anti-fouling paints of different active copper compounds range from 0.5 to 75 lg cm À2 day À1 . Approximately 80% of the released total copper was determined to be electrochemically active (labile fraction) for all paints investigated. The remaining fraction is more strongly bonded non-bioavailable copper complexes with species released from the paints. Model calculations, using MinteqA2, predicted only a small portion (% 6%) of the total copper released as free cupric ions (Cu(H 2 O) 2+ 6 ), the most bioavailable form of copper. Similar results were obtained with bioassay testing using bacteria and yeast on released copper from massive copper sheet exposed at identical conditions. The large difference between the total and the bioavailable copper fraction emphasizes the importance of generating chemical speciation data for accurate decisions of potential adverse effects of copper release from antifouling paints. The observed release of other metals and organic substances from the paint matrix, implies the importance to assess an integrated response from released species from paints of antifouling, and not only from single ingredients.

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Effect of pH on the complexation parameters for organic matter dissolved in river water

Cited by 8 publications

References 10 publications

Temporal variation of copper and zinc complexation capacity in the Humber estuary

Temporal variation of copper and zinc complexation capacity in the Humber estuary

Recovering metal(loids) and rare earth elements from closed landfill sites without excavation: Leachate recirculation opportunities and challenges

Release and chemical speciation of copper from anti‐fouling paints with different active copper compounds in artificial seawater

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