The Oxidation of Arsenite by Aquatic Sediments

Oscarson, D. W.; Huang, P. M.; Liaw, W. K.

doi:10.2134/jeq1980.00472425000900040032x

Cited by 122 publications

(79 citation statements)

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“…It has been pointed out that manganese (III/IV) oxide particles in natural waters participate in a number of oxidation reactions involving both organic and inorganic com-pounds, increasing the mobility of manganese and its availability to organisms. Although the reduction reactions occurring at the manganese oxide/water interface have received considerable attention for many years (Stone and Morgan, 1984a,b;Oscarson et al, 1980), the oxidation of organic pollutants at the natural manganese mineral surface as a degradable pathway is poorly studied.…”

Section: Introductionmentioning

confidence: 99%

Oxidative decolorization of direct light red F3B dye at natural manganese mineral surface

Liu

Tang

2000

Water Research

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Section: Introductionmentioning

confidence: 99%

Oxidative decolorization of direct light red F3B dye at natural manganese mineral surface

Liu

Tang

2000

Water Research

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“…The oxidation of As(III) to As(V) by manganese oxide minerals is an important means of altering the toxicity of arsenic in aquatic environments (Oscarson et al, 1980(Oscarson et al, , 1981a(Oscarson et al, , 1981b(Oscarson et al, , 1983. As common particulates in fresh and marine environments, various forms of manganese oxides mediate these reactions (Jenne, 1968;Murray, 1975;Martin and Meybeck, 1979;Wangersky, 1986;Lind, 1988).…”

Section: Introductionmentioning

confidence: 99%

“…As common particulates in fresh and marine environments, various forms of manganese oxides mediate these reactions (Jenne, 1968;Murray, 1975;Martin and Meybeck, 1979;Wangersky, 1986;Lind, 1988). Birnessite, a frequently encountered, natural form of manganese oxide in modern sediments and soils (Jones and Milne, 1956;Giovanoli et al, 1970a), is an important component in the natural oxidation of As(III) to As(V) (Oscarson et al, 1980). Because As(III) is more toxic than As(V) (Coddington, 1986), this reaction controls arsenic toxicity.…”

Section: Introductionmentioning

confidence: 99%

Reaction Scheme for the Oxidation of as(III) to as(V) by Birnessite

Moore

Walker

Hayes

1990

Clays and clay miner.

100

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Abstract--The oxidation of As(III) to As(V) by K-birnessite was examined at different temperatures, pHs, and birnessite/As(III) ratios. Experiments ranged in duration from 5 to 64 hr, and solution and solid products were determined at several intervals. All experiments showed that the reaction produced large amounts of K + to solution and very little Mn 2+. As(V) was released to solution and incorporated into the K-birnessite. The oxidation was initially rapid and then slowed. The oxidation of As(III) was probably facilitated initially by autocatalytic Mn-As(V) reactions occurring mostly in the interlayer, in which large amounts of As(V) and K + could be easily released to solution. The reaction also slowed when interlayer Mn was exhausted by forming Mn-As(V) complexes. Mn(IV) could only be acquired from the octahedral sheets of the birnessite. The two-stage reaction process proposed here depended on the layered structure of birnessite, the specific surface, and presence of exchangeable cations in K-birnessite.

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“…Earlier Oscarson et al (1980) reported the abiotic oxidation of As(Ill) to As(V) by freshwater lake sediments. Here evidence is presented indicating that Mn is the primary sediment component responsible for the oxidation of As(III) to As(V).…”

Section: Introductionmentioning

confidence: 99%

Role of Manganese in the Oxidation of Arsenite by Freshwater Lake Sediments

Oscarson

Huang

Liaw

1981

Clays and clay miner.

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The importance of various sediment components in the oxidation of As(III) (arsenite) to As(V) (arsenate) by freshwater lake sediments in southern Saskatchewan was examined. Treating the sediments with hydroxylamine hydrochloride or sodium acetate to remove Mn greatly decreased the oxidation of As(III). Furthermore, synthetic Mn(IV) oxide was a very effective oxidant with respect to As(liD: 216 t~g As(V)/ml was formed in solution when 1000 txg As(III)/ml was added to suspensions of 0.1 g of the oxide. These results indicate that Mn in the sediment was probably the primary electron acceptor in the oxidation of As(III). The conversion of As(III) to As(V) by naturally occurring carbonate and silicate minerals common in sediments was not evident in the system studied. Sediment particles >20 ~.m in size are the least effective in oxidizing As(III); the oxidizing ability of the 5-20-, 2-5-, and <2-/~m particle size fractions varies depending on the sediment. The concentration of As(V) in equilibrated solutions after adding increasing amounts of As(III) (as much as 100/~g/ml) to 1 g of the three sediments ranged from approximately 3.5 to 19 p.g/ml. Because As(III) is more toxic and soluble than As(V), Mn-bearing components of both the colloidal and non-colloidal fractions of the sediments may potentially detoxify any As(Ill) that may enter aquatic environments by converting it to As(V). This is very important in reducing the As contamination and in maintaining the ecological balance in aquatic environments.

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The Oxidation of Arsenite by Aquatic Sediments

Cited by 122 publications

References 0 publications

Oxidative decolorization of direct light red F3B dye at natural manganese mineral surface

Oxidative decolorization of direct light red F3B dye at natural manganese mineral surface

Reaction Scheme for the Oxidation of as(III) to as(V) by Birnessite

Role of Manganese in the Oxidation of Arsenite by Freshwater Lake Sediments

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