1995
DOI: 10.1029/94jd03111
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Reduction of Fe(III) with sulfite in natural waters

Abstract: The Fe(III) in marine aerosols and rainwaters can be reduced to Fe(II) by photochemical processes and by reactions with sulfite. In this paper, measurements of the rates of reduction of nanomolar levels of Fe(III) with sulfite (without 02) have been determined in NaC1 and seawater solutions as a function of temperature (0 ø to 40øC) + 2+ ' pH (2 to 6.8), ionic strength (I = 0.1 to 6 M), and composition (Na , Mg , Ca 2+, F-, CI-, Br-, HCO•-, SO4:-). The overall rate constant (k, M -1 min -1) for the reaction, F… Show more

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Cited by 43 publications
(25 citation statements)
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“…These data showed that the reduction of nanomolar concentrations of Fe(III) in acidified seawater with 100 M sulphite at room temperature (21 • C) was complete after 4 h; therefore a 12 h reduction time is more than sufficient for seawater DFe determinations. The data showed good agreement with those of Millero et al [28] who reported a ln k value of 4.08 M −1 min −1 in seawater acidified to pH 2 at 25 • C with the same sulphite concentration.…”
Section: Kinetics Of Iron(iii) Reduction For Total Dissolved Iron (Dfsupporting
confidence: 88%
“…These data showed that the reduction of nanomolar concentrations of Fe(III) in acidified seawater with 100 M sulphite at room temperature (21 • C) was complete after 4 h; therefore a 12 h reduction time is more than sufficient for seawater DFe determinations. The data showed good agreement with those of Millero et al [28] who reported a ln k value of 4.08 M −1 min −1 in seawater acidified to pH 2 at 25 • C with the same sulphite concentration.…”
Section: Kinetics Of Iron(iii) Reduction For Total Dissolved Iron (Dfsupporting
confidence: 88%
“…The observed Cu(II) concentration in the same size fraction as soluble iron indicates that the Fe(II) at night could have been related to aqueous-phase reductions of Fe(III) to Fe(II) by Cu(I) species. Fe(III) catalyzed oxidation of sulfur (IV) has been suggested to be another important source of Fe(II) in cloud water during nighttime (Schwanz et al, 1998;Millero et al, 1995). However, with no data available on sulfur (IV) measurements during FCE 1.1, conclusions about the contribution of this pathway cannot be made.…”
Section: Size-resolved Soluble Metal Ionsmentioning
confidence: 58%
“…NTA and EDTA have been shown to affect the kinetic of Fe(II) oxidation (Santana-Casiano et al, 2000). F Ϫ forms a FeF 2ϩ ion pair that is nonreactive to reduction (Millero et al, 1995a). Considering that in our studies the Fe(III) is present due to both, the Fe(II) oxidation and natural Fe(III), NaF was used at a final concentration 1.25 M to complex any soluble Fe(III) and to avoid any interference.…”
Section: Fe(ii) Analysismentioning
confidence: 99%
“…Millero et al (1991) studied the effect of ionic interactions on the rates of oxidation of Fe(II) with hydrogen peroxide at micromolar levels in different media. In recent years, the chemiluminiscence technique using the luminol reagent has been used to study the oxidation of Fe(II) at nanomolar levels in different media (King et al, 1995;Millero et al, 1995a;King and Farlow, 2000). The utilization of a long liquid waveguide capillary flow cell (LWCFC) permits the spectrophotometric determination of Fe(II) at nanomolar levels (Zhang et al, 2001).…”
Section: Introductionmentioning
confidence: 99%