Computer Science
Scientific paper
Aug 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995gecoa..59.3123z&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 59, Issue 15, pp.3123-3130
Computer Science
4
Scientific paper
The kinetics of photochemical reduction of Fe(III) coupled with organic ligands has been investigated to understand the photoredox cycling of Fe and the significance of this cycling in the production of photo-oxidants and transformation of S(IV) and organic pollutants in atmospheric waters. The photoreduction of ferrioxalate ion is first order with respect to Fe(III) and has a rate constant of 4.0 ± 0.4 × 10 -2 s -1 in anoxic solutions at summer clear-day-noon time. In the presence of oxygen, the oxalate radical formed in the primary photoreaction further reduces O 2 to HO . 2 /O . - 2 , leading to the reoxidation of Fe(II) and the formation of H 2 O 2 . At a photochemical steady-state, the ratio of Fe(II)/Fe(III) is determined by: where subscript ss denotes steady-state, k s and k 9 are the rate constants for photoreduction of Fe(III) complex and the oxidation of Fe(II) by HO . 2 /O . - 2 , respectively, and [HO . 2 /O . - 2 ] is the concentration of HO . 2 /O . - 2 . During sunny daytime, a large fraction of Fe is present as Fe(II), which provides a significant source of dissolved Fe(II) for the primary productivity in surface water systems.
No associations
LandOfFree
Kinetics of photochemical/chemical cycling of iron coupled with organic substances in cloud and fog droplets does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Kinetics of photochemical/chemical cycling of iron coupled with organic substances in cloud and fog droplets, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Kinetics of photochemical/chemical cycling of iron coupled with organic substances in cloud and fog droplets will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1270307