Interactions of ferric and ferrous irons and organic matter in water environment

Akiyama, Toshiko

doi:10.2343/geochemj.7.167

Cited by 19 publications

(4 citation statements)

References 17 publications

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“…This hypothesis is supported by, for example, [33], who showed that ferrous and ferric iron in aqueous solution at neutral pH and under oxic conditions interacted with organic matter and that both iron species were held in solution in concentrations in excess of what would be theoretically expected. Furthermore, [34] discovered that under reduced conditions, ferrous iron in the form of ferrous hydroxide can interact with organic matter, resulting in co-precipitation of the species.…”

Section: Influence Of Organic Mattersupporting

confidence: 63%

Sulfide Precipitation in Wastewater at Short Timescales

Kiilerich

Ven

Nielsen

et al. 2017

Water

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Abatement of sulfides in sewer systems using iron salts is a widely used strategy. When dosing at the end of a pumping main, the reaction kinetics of sulfide precipitation becomes important. Traditionally the reaction has been assumed to be rapid or even instantaneous. This work shows that this is not the case for sulfide precipitation by ferric iron. Instead, the reaction time was found to be on a timescale where it must be considered when performing end-of-pipe treatment. For real wastewaters at pH 7, a stoichiometric ratio around 14 mol Fe(II) (mol S(−II)) −1 was obtained after 1.5 s, while the ratio dropped to about 5 mol Fe(II) (mol S(−II)) −1 after 30 s. Equilibrium calculations yielded a theoretic ratio of 2 mol Fe(II) (mol S(−II)) −1 , indicating that the process had not equilibrated within the span of the experiment. Correspondingly, the highest sulfide conversion only reached 60%. These findings differed significantly from what has been demonstrated in previous studies and what is attained from theoretical equilibrium conditions.

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Section: Influence Of Organic Mattersupporting

confidence: 63%

Sulfide Precipitation in Wastewater at Short Timescales

Kiilerich

Ven

Nielsen

et al. 2017

Water

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“…The higher Fe:OC ratio in the larger fractions may be caused not by more Fe being coordinated by this portion but by the association of colloidal Fe containing particles with the organics in this fraction, which have higher ash contents (Giesy and Briese, 1977). Organics may be flocculated and coprecipitated by Fe hydroxides (Akiyama, 1973). This coprecipitation is dependent on the chemical natt, re of the organics and larger diameter fractions may result from polymerization of small tractions by Fe.…”

Section: Resultsmentioning

confidence: 99%

Metal binding capacity of selected maine surface waters

Giesy

Briese

Leversee

1978

Geo

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ABSTRACT/Concentrations of Ca, Cd, Cu, Fe, and Pb and binding capacities for Cd, Cu, and Pb were determined for water samples collected from 12 lakes in southwestern Maine using atomic absorption and ion-selective electrodes, respectively. Surface waters in this area are soft and characterized by low pH. Some lakes were highly colored with refractory organics, whereas others had very low organic carbon concentrations. Both Cu and Pb concentrations were positively correlated with organic carbon content. Copper and Pb binding capacities were significantly correlated with organic carbon content, whereas Cd binding capacity was positively correlated with pH, but not with organic carbon. Surface water binding capacity for Pb was greater than that for Cu or Cd. More than 99% of the Ca from all waters studied was removed onto cationic exchange resins. Less than 1% of the total Cu existed as cationic species in highly humic waters, whereas as much as 65% existed as cationic species in less humic waters. Conversely, more than 99% of the Cd present in humic waters existed as cationic species, whereas as little as 50% existed as cationic species in less humic, more alkaline waters. These correlative studies indicate that binding by organic carbon is important for both Cu and Pb in this area and must be considered in models of trace metal speciation. However, Cd binding in the same waters is not correlated with organic carbon, which does not need to be considered in speciation models for Cd.

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“…Organic matter and bacteria in sediments derived from bottom-dwelling animals and plant material play a significant role in mineral complexing, precipitation and reprecipitation. Akiyama [77], in a laboratory experiment, found that ferrous (and ferric) iron co-precipitated with dissolved organic matter. Under such conditions, ferrous iron, once precipitated, is prevented from going back into solution.…”

Section: Role Of Organic Matter and Bacteriamentioning

confidence: 99%

Paleoenvironmental Implications of Selected Siderite Zones in the Upper Atoka Formation, Arkoma Basin, Oklahoma-Arkansas: A Look Back and Current Views on Siderite Genesis in a Sedimentary Environment

Campbell¹

2018

Int J Earth Sci Geol

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According to the policy announced by the senior author (Campbell, 2017), this paper is based on data derived from the field work produced by the senior author during the mid-1970s as part of his research at Rice University. This paper covers field and follow-on sampling and evaluations developed from monitoring the literature on siderite genesis to date, including additional laboratory work on new samples obtained at the field sites, including incorporated carbonates and preliminary work on siderite remanent magnetism.Occurrences in the two study areas of so-called 'clayband' and "black-band" siderite and zones of siderite-replaced marine fossils and associated sediments are reported in selected sandstone and shale sequences of the upper Atoka Formation of Arkansas and Oklahoma. Outcrops near Pocola, Oklahoma and Hackett, Arkansas were examined to characterize the paleoenvironmental conditions of deposition that may have promoted the genesis of siderite. Eight types of bedded or redistributed siderite were defined, each showing specific responses to bioturbation, to physical erosion and transport, and to chemical replacement and redistribution.The clay minerals contained within the siderite zones and associated shale consist of kaolinite and illite in nearly equal proportions, with the former also possibly consisting of a kaolinite-type chamosite and the latter consisting of a significant 2M muscovite poly type. Interpretations based on sedimentary structures, texture and mineralogy of the sediments associated with the siderite zones indicate that specific sequences were likely deposited in a tidal flat or intra-deltaic environment in proximity to normal marine conditions. A primary or syngenetic origin is proposed for some of the bedded types of siderite occurrence. Other sequences indicate that marine conditions also prevailed. Physio-chemical requirements for siderite genesis suggest that siderite does not form syngenetically in a marine depositional environment but could syndiagenetically result under normal post-burial conditions involving organic-rich material (organic matter?) or a subsurface environment with a high Fe +2 :Ca +2 ratio and low SO 3 in solution. These conditions likely promoted characteristic siderization of calcareous material within marine sediments in proximity to or down the paleogeohydraulic gradient from areas of either syngenetically-produced siderite or iron-rich groundwater derived from coal-forming swamps.

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Interactions of ferric and ferrous irons and organic matter in water environment

Abstract: These results show the significance of the interaction of organic matter and iron in the cycle of them in the hydrosphere.

Cited by 19 publications

References 17 publications

Sulfide Precipitation in Wastewater at Short Timescales

Sulfide Precipitation in Wastewater at Short Timescales

Metal binding capacity of selected maine surface waters

Paleoenvironmental Implications of Selected Siderite Zones in the Upper Atoka Formation, Arkoma Basin, Oklahoma-Arkansas: A Look Back and Current Views on Siderite Genesis in a Sedimentary Environment

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