Effect of seasonal changes on the complexing of Cu(II) by dissolved organic matter in river water

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

doi:10.1016/s0043-1354(98)00034-7

Cited by 13 publications

(8 citation statements)

References 5 publications

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“…An orion copper-selective electrode was used for the determination of total and labile copper according to previously described procedure. 3,27 The FA-copper solutions were agitated by means of a Memmert (France) end-over-end mechanical shaker. Phase separation was assisted using a Hettich, Universal centrifuge.…”

Section: Instrumentationmentioning

confidence: 99%

“…2 Several studies have shown that binding of metallic ions with humic or fulvic substances increases metal mobility in natural waters and controls their toxicity, bioavailability and transport. 3,4 The transportation and fate of trace metal ions are currently receiving particular attention due to their strong environmental impact. Free metal ions, which are considered to represent the bioavailable metal fraction, consist of hydrated metal cations along with their soluble organic and inorganic complexes.…”

Section: Introductionmentioning

confidence: 99%

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Copper fractionation with dissolved organic matter in natural waters and wastewater—a mixed micelle mediated methodology (cloud point extraction) employing flame atomic absorption spectrometry

et al. 2002

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A cloud point extraction-preconcentration methodology for the speciation analysis of free and organically complexed metal species in natural waters is presented. The method is based on the neutralization of the electrostatic charge of the humate-metal complexes with a positively charged surfactant in a high ionic strength solution environment. The resulting complexes are conveniently solubilized in the micelles of a non-ionic surfactant medium and are thus separated from the bulk aqueous phase. Free metal species are also determined by complexation with a conventional chelating agent under mild conditions. The overall procedure is easy, rapid and allows for a high sample throughput in terms of massive analysis of many samples in the same time period. The method offers substantially low detection limits of 8.5 and 0.9 micrograms l-1 for bound and labile species respectively, with a calibration curve rectilinear in the wide range 40-150 micrograms l-1 for the humate associated and 4-40 micrograms l-1 for the free metal species. The method is free from interferences yielding recoveries in the range 97-102% for various samples of different matrixes.

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Section: Instrumentationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Copper fractionation with dissolved organic matter in natural waters and wastewater—a mixed micelle mediated methodology (cloud point extraction) employing flame atomic absorption spectrometry

et al. 2002

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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: 98%

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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“…Little information on a generalised survey basis is available. Buykx et al (1999) report complexation capacity data in the range 100-500 nM for 14 European rivers; Antello et al (1998) studied seasonal variation of copper speciation in two Spanish rivers. This paper is intended to add to the data on copper complexation in freshwaters.…”

Section: Introductionmentioning

confidence: 99%

Copper complexation in English Rivers

Gardner

Dixon

Comber

2000

Chemical Speciation & Bioavailability

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Effect of seasonal changes on the complexing of Cu(II) by dissolved organic matter in river water

Cited by 13 publications

References 5 publications

Copper fractionation with dissolved organic matter in natural waters and wastewater—a mixed micelle mediated methodology (cloud point extraction) employing flame atomic absorption spectrometry

Copper fractionation with dissolved organic matter in natural waters and wastewater—a mixed micelle mediated methodology (cloud point extraction) employing flame atomic absorption spectrometry

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

Copper complexation in English Rivers

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