Natively retained sulfate and its effect on the acid buffering capacity of andosols

Fumoto, Tamon; Iwama, Hidenori; Banzai, Kenji

doi:10.1016/0883-2927(95)00100-x

Cited by 7 publications

(2 citation statements)

References 3 publications

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“…Therefore, inorganic SO 4 2– retention plays a key role in soils affected by acid deposition involving S input (Johnson et al ., 1981; Fumoto et al ., 1996) and is regarded as an important process in acid‐buffering of Andosols (Fumoto et al ., 1996). Yet this process stores acidity as SO 3 , which might eventually produce sulphuric acid, once released (van Breemen et al ., 1983).…”

Section: Introductionmentioning

confidence: 99%

Inorganic sulphate extraction from SO₂‐impacted Andosols

Delfosse

Delmelle

Givron

et al. 2004

European J Soil Science

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Sulphate sorption on to the surface of short-range ordered minerals and precipitation of Al-hydroxy sulphate contribute to the acid neutralizing capacity of soils. The correct measurement of total inorganic sulphate is thus essential in soils that are accumulating SO 4 2-anions. We extracted SO 4 2-by various solutions, namely 0.005 M Ca(NO 3 ) 2 , 0.016 M KH 2 PO 4 , 0.5 M NH 4 F and 0.2 M acidic NH 4 -oxalate (pH 3), from Vitric and Eutric Andosols exposed to prolonged deposition of acid and SO 2 from an active volcano (Masaya, Nicaragua). We attributed sulphate extractable by KH 2 PO 4 (20-3030 mg kg À1 ) to anion-exchangeable SO 4 2-, which was much smaller than NH 4 F-and oxalate-extractable SO 4 2-(400-9680 and 410-10 480 mg kg À1 , respectively). Our results suggest the occurrence of a sparingly soluble Al-hydroxy-mineral phase extractable by both NH 4 F and oxalate. The formation of Al-hydroxy minerals would result from the combination of enhanced weathering caused by strong acid loading and simultaneous occurrence of large SO 4 2-concentrations in soil solution. Oxalate extracted slightly more inorganic SO 4 2-than did NH 4 F, this additional amount of SO 4 2-correlating strongly with oxalate-extractable Si and Fe contents. Preferential occlusion of SO 4 2-by short-range ordered minerals, especially ferrihydrite, explains this behaviour. If we exclude the contribution of occluded sulphate then oxalate and NH 4 F mobilize similar amounts of SO 4 2-and are believed to mobilize all of the inorganic SO 4 2-pool.

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Section: Introductionmentioning

confidence: 99%

Inorganic sulphate extraction from SO₂‐impacted Andosols

Delfosse

Delmelle

Givron

et al. 2004

European J Soil Science

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“…Concerning the soil acidification–recovery processes, one of the distinct features of Asian ecosystems is the extensive occurrence of SO 2− 4 adsorbing soils, such as Andisols, in which SO 2− 4 adsorption capacity has a high correlation with the Al content in allophane and imogolite (Fumoto et al, 1996a,b). The molar H + to SO 2− 4 adsorption ratio on soils and minerals is generally less than 2.0 and dependent on pH (Karltun, 1997; Persson and Lövgren, 1996; He et al, 1996), and the resulting net negative charge may affect the base cation dynamics in the soil.…”

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confidence: 99%

Implementation of Sulfate Adsorption in the SAFE Model

Fumoto

Sverdrup

2001

J of Env Quality

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An SO4(2-) adsorption submodel has been implemented in the dynamic soil chemistry model SAFE. The submodel calculates pH-dependent SO4(2-) and H+ adsorption to the soil, as well as the net surface charge development due to uneven adsorption of SO4(2-) and H+, using the empirical equations derived from an electrostatic model (Extended Constant Capacitance Model, ECCM) of SO4(2-) adsorption. The resulting new SAFE model was applied on a roof experiment plot in the Norway spruce [Picea abies (L.) H. Karst.] stand at Solling, Germany, where atmospheric S and N deposition was artificially reduced by the roof construction. The model performance was compared with the previous versions that used a pH-independent Freudlich model of SO4(2-) adsorption or assumed no SO4(2-) adsorption. With the ECCM-based SO4(2-) adsorption submodel, SAFE simulated soil solution SO4(2-) concentration and base saturation better, in comparison with measured data, than with the previous SO4(2-) adsorption formulations. Through the model application, also, need of additional improvement was suggested, such as calibration of mass transfer coefficients.

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