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Copper complexation in marine and terrestrial rain water

Copper complexation in marine and terrestrial rain water,10.1016/j.atmosenv.2005.01.035,Atmospheric Environment,Melanie Witt,Tim Jickells

Copper complexation in marine and terrestrial rain water   (Citations: 3)
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The complexation of copper was studied in rainwater collected in Norwich, UK, and during Atlantic and Indian Ocean cruises. The complexation was measured with Chelex resin, Sep-Pak columns and adsorptive cathodic stripping voltammetry with tropolone as a competing ligand. Strong organic complexation was observed in semi-urban and marine rain samples with conditional stability constants between 1011 and 1014. Model solutions of copper and humic matter found organic complexes of a similar strength to those observed in the rain samples suggesting humic material as a potential ligand. A large proportion of the copper in the rains was associated with strong organic complexes over the pH range 4–8 in both filtered and unfiltered rain samples suggesting organic complexation is an important process both in the atmosphere and on arrival to oceans.
Journal: Atmospheric Environment - ATMOS ENVIRON , vol. 39, no. 40, pp. 7657-7666, 2005
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    • ...Processes that affect ligand concentrations can have critical effects 90 J Atmos Chem (2007) 58:89–109...
    • ...The ACSV measurements were carried out with salicylaldoxime (SA) as the J Atmos Chem (2007) 58:89–109 91...
    • ...A 5 ml aliquot of sample was then placed in a Teflon electrochemical cell and buffered to pH 7.8 with HEPES and SA to a final concentration of 80 μM. This sample was analysed by ASCV as above, except a deposition potential of −1.1 V was used to ensure full dissociation of any 92 J Atmos Chem (2007) 58:89–109...
    • ...Highly absorbing samples were diluted with MQ J Atmos Chem (2007) 58:89–109 93...
    • ...Samples of rainwater were spiked to a final concentration of 50 nM Cu(II) by addition of 250 μl of a secondary Cu(II) stock (20 μM; pH=3) to 100 ml of a 0.2 μm filtered, 94 J Atmos Chem (2007) 58:89–109...
    • ...EEMS were constructed by concatenating emission spectra measured every 4 nm from 250 to 550 nm using excitation wavelengths from 250 to 500 nm (4 nm intervals) (Del Castillo et al. 1999) J Atmos Chem (2007) 58:89–109 95...
    • ...Fig. 2 Change in total integrated fluorescence of CDOM upon addition of a 50 nM Cu(II) spike as a function of initial total integrated CDOM fluorescence 96 J Atmos Chem (2007) 58:89–109...
    • ...Higher levels of 98 J Atmos Chem (2007) 58:89–109...
    • ...Inrainevent 585 the weakerligandclass(logK′CuL=13) showed a smaller concentration increase when UV radiation was eliminated whereas the stronger class of ligand 102 J Atmos Chem (2007) 58:89–109...
    • ...Conditional stability constants shown in legend for each rain event J Atmos Chem (2007) 58:89–109 103...
    • ...Solid line shows unfiltered rain, broken line filtered (0.2 μm) 104 J Atmos Chem (2007) 58:89–109...
    • ...Error bars represent the standard error in the slopes of Ligand/ Time or CDOM/Time J Atmos Chem (2007) 58:89–109 105...

    Melanie Louise Inez Wittet al. Photochemistry of Cu complexed with chromophoric dissolved organic mat...

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