Isotopic Exchange Characteristics of Aluminum‐ and Iron‐bound Fractions of Soil Phosphorus

Tandon, H. L. S.; Kurtz, L. T.

doi:10.2136/sssaj1968.03615995003200060027x

Cited by 10 publications

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“…Pour la majorité des échantillons de terre prélevés sur des sols cultivés (Wiklander, 1950; : elles rendent alors toute interprétation des ré-sultats délicate lorsque les mécanismes réellement mis en jeu au cours des extractions ne sont pas connus (Jenkins, 1966;Halstead, 1967;Tandon and Kurtz, 1968;Gachon, 1972 (Barrow and Shaw, 1975 (Fardeau et al, 1992). Extrapoler des résultats sur des durées relativement longues pose le problème de la précision des différentes déterminations.…”

Section: Introductionunclassified

“…C'est pourquoi pour la majorité des échantillons de terre la valeur retenue pour la quantité de phosphore contenu dans P L sera la quantité E Pie1 . Ce n'est que dans le cas des sols à très fort pouvoir fixateur que la quantité E Pie1 surestime de 10% à 20% la quantité de phosphore du pool des ions directement biodisponibles (Salcedo et al, 1991 (Sheppard, 1962;Shipley, 1972 (Tandon and Kurtz, 1968;Gachon, 1972 (Barrow and Shaw, 1975;Barrow, 1980), la durée probable de l'effet d'un engrais phosphaté.…”

Section: Introductionunclassified

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Le phosphore assimilable des sols : sa représentation par un modèle fonctionnel à plusieurs compartiments

Fardeau

1993

Agronomie

100

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Section: Introductionunclassified

Le phosphore assimilable des sols : sa représentation par un modèle fonctionnel à plusieurs compartiments

Fardeau

1993

Agronomie

100

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“…Exchangeable P, as determined by isotope dilution has been used as an index of available P in soils (Baker, 1964; Tandon and Kurtz, 1968). Recently, exchangeable sediment inorganic P was investigated under controlled conditions (oxygen status, pH, and temperature) in a long-term equilibration system (Li et al, 1972).…”

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confidence: 99%

Measurement of exchangeable inorganic phosphate in lake sediments

Li¹,

Armstrong²,

Harris³

1973

Environ. Sci. Technol.

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H The amounts of isotopically exchangeable inorganic phosphate in a range of Wisconsin lake sediments were measured in two contrasting (long-and short-term) equilibration systems. The systems differed in equilibration times, oxidation-reduction conditions, and the degree of agitation. Levels of total exchangeable inorganic P were similar for the two systems, indicating that the simplified short-term equilibration method was suitable for routine measurements of exchangeable inorganic P. Differences between the two systems in the distribution of exchangeable P between the solid and solution phases were apparently related to differences in oxidation-reduction conditions. Exchangeable inorganic P ranged from 18-65% of the total inorganic P in the sediments investigated.The role of phosphorus in lake eutrophication is of widespread concern because of the importance of P as an essential and often limiting plant nutrient. Lake eutrophication is in part a problem of the presence of a sufficient quantity of available P to allow lakes to reach a high level of productivity of algae and high plants, The interchange of P between sediments and lake water may play an important role in determining the available P status of lakes. The uptake and release of P by sediments is a function of interacting physical, chemical, and biological processes (Syers et al., 1973) and cannot be accurately predicted a t the present time. The ability of sediments to sorb inorganic P is well documented (Harter, 1968; Williams et al., 1970; Shukla et al., 1971).The direction of net P transport is generally from the lake water to the sediments (Megard, 1973), presumably due to particle settling and sorption processes. However, the direction of transport of dissolved inorganic P will often be from the sediments to the overlying water due to direct biological uptake and the higher levels of inorganic P in the sediment interstitial water than in the overlying lake water (see review by Syers et al., 1973). Exchangeable inorganic P represents the pool of sediment inorganic P characterized by a high potential for interaction with the sediment interstitial water and the overlying lake water (Li et al., 1972).Exchangeable P, as determined by isotope dilution has been used as an index of available P in soils (Baker, 1964; Tandon and Kurtz, 1968). Recently, exchangeable sediment inorganic P was investigated under controlled conditions (oxygen status, pH, and temperature) in a long-term equilibration system (Li et al., 1972). Although the longterm system provided information on the exchangeable sediment inorganic P under certain limnological conditions, the method was time-consuming and not well suited for the routine determination of exchangeable inorganic P in lake sediments. This investigation was conducted to evaluate the applicability of a relatively simple short-term equilibration system for exchangeable P measurements. Sediments. The sediments were obtained from eightWisconsin lakes. The methods of sampling and storage of the sediments used in this in...

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“…That this reaction occurs in soils and, consequently, in fresh waters is evident from numerous observations of phosphate sorption to soils and sediments rich in these metal phases (for soils see; Russell etal., 1954;Talibudeen, 1958;Nagarajah etal., 1968;Tandon & Kurtz, 1968;Mattingly, 1975;Barrow & Shaw, 1975;Rajan & Fox, 1975;Munns & Fox, 1976;Rajan & Watkinson, 1976;Ryden & Syers, 1977;Taylor & Ellis, 1978; for sediments see; Williams etal., 1967Williams etal., , 1970Williams etal., , 1976Ku etal., 1978;Shukla et al, 1971;Kuo & Lotse, 1974).…”

Section: Model Developmentmentioning

confidence: 99%

The chemistry of aquatic phosphate: inorganic processes in rivers

Fox¹

1993

Hydrobiologia

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Phosphate levels in turbid rivers with low calcium concentrations are controlled by a solid ferric hydroxide-phosphate solution present in colloidal suspensions or suspended particulates. A chemical model, based on this behavior, is consistent with data from dialyzed suspensions of iron and phosphorus prepared in the laboratory as well as from the Amazon, Zaire, Orinoco, Sepik, Delaware, Hudson, Negro, and Mullica rivers. Data indicate that solid Fe/P ratios are related to solid activity coefficients by an exponential parameter, y, which represents the deviation of solid-solution from ideality. The model is mathematically consistent with Langmuir and Freundlich sorption isotherms under equilibrium conditions, and demonstrates that the isotherm parameters consist of a combination of selected constants and variables defined by solution theory. The reciprocal of the model parameter-y is shown to be equivalent to the exponential parameter in a Freundlich isotherm. The Langmuir parameter and Freundlich exponential parameter are related through the model parameter-y in systems at constant pH and ionic strength.

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Isotopic Exchange Characteristics of Aluminum‐ and Iron‐bound Fractions of Soil Phosphorus

Cited by 10 publications

References 0 publications

Le phosphore assimilable des sols : sa représentation par un modèle fonctionnel à plusieurs compartiments

Le phosphore assimilable des sols : sa représentation par un modèle fonctionnel à plusieurs compartiments

Measurement of exchangeable inorganic phosphate in lake sediments

The chemistry of aquatic phosphate: inorganic processes in rivers

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