The concentration of phosphorus in glassy melt inclusions and rehomogenized nanogranitoids suggests a strong control of melt aluminosity on apatite solubility in peraluminous granites, which is consistent with existing experimental studies.
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1980-12-1 Apatite and phosphorus in the source regions of basic magmas 4.1. Evidence for apatite in the upper mantle The first question to be dealt with in addressing the topic of residual apatite in the mantle is whether apatite is present even before the onset of melting. As noted previously, thermodynamic calculations indi- cate that fluorapatite is ...
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Because of the high solubility of apatite in basic magmas, phosphorus can be confidently treated as an incompatible element in peridotite melting models. Such models, in combination with observed characteristics of basic lavas, indicate that the upper mantle contains ∼200 ppm of phosphorus, much less than the chondritic abundance of ∼900 ppm.
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The phosphorus (P) present in apatitic materials is largely in forms that are not readily available for most arable crops. Many attempts have been made to increase the dissolution of phosphate rock. Hence, soluble P or superphosphate used as fertilizer has been produced by
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After more than 550 days feeding, sorption was still present and low P outlet levels were still being obtained when sufficient contact time and calcium content in the solution were ensured. This work demonstrates the advantages of using apatites for phosphorus removal in constructed wetlands. The behaviour of apatite in phosphorus retention is ...
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The recovery of phosphorus from incinerated sewage sludge ash (SSA) is assumed to be economical. Transformation from non-apatite inorganic phosphorus (NAIP) to apatite phosphorus (AP), which has a higher bioavailability and more extensive industrial applications, was studied at 750-950°C by sewage sludge incineration and model compound incineration with a calcium oxide (CaO) additive.
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2015-3-4 Although apatite is the predominant form of mineral phosphorus in the Earth’s crust, biological forms (i.e. dental and skeletal apatite) have received most attention in kinetic studies. Dissolution experiments with fluorapatite under geologically relevant conditions demonstrate that rates are
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If phosphorus is the ultimate controlling nutrient over geologic time scales, then long-term marine NEP is coupled to the release of phosphorus from apatite weathering. The most abundant apatite compositions found in nature are igneous fluorapatite and marine sedimentary carbonate fluorapatite.
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2014-7-14 Some soluble phosphate salts, heavily used in agriculture as highly effective phosphorus (P) fertilizers, cause surface water eutrophication, while solid phosphates are less effective in supplying ...
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2010-8-9 leaching. Phosphate leached from guano phosphatizes the underlying rocks in some areas, forming apatite where the host rock is limestone and forming aluminum- or aluminum-iron-phosphate minerals where the underlying rock is a silicate. Individual
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The concentration of phosphorus in glassy melt inclusions and rehomogenized nanogranitoids suggests a strong control of melt aluminosity on apatite solubility in peraluminous granites, which is consistent with existing experimental studies.
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If phosphorus is the ultimate controlling nutrient over geologic time scales, then long-term marine NEP is coupled to the release of phosphorus from apatite weathering. The most abundant apatite compositions found in nature are igneous fluorapatite and marine sedimentary carbonate fluorapatite.
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The weathering of apatite, the primary phosphorus sink in Earth's exosphere, controls long-term phosphorus availability. If phosphorus is the ultimate controlling nutrient over geologic time ...
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Between February 1992 and June 1993 the distribution of particulate and dissolved phosphorus in the Ems estuary was investigated in approximately monthly intervals. Furthermore, the phosphorus content of sediments was assessed. These data as well as literature data were used to construct a phosphorus budget of the Ems estuary. Fluxes were dominated by the particulate fraction representing 77% ...
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Studies of apatite mineral formation are complicated by the possibility of forming several calcium phosphate phases. The least soluble, hydroxyapatite (HAP), is preferentially formed under neutral or basic conditions. In more acidic solutions phases such as dicalcium phosphate dihydrate (Brushite, D
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2005-5-1 In parallel, observation of the material by electron microscopy was used to give more precision information about the mechanisms involved. This work reveals the strong chemical affinity between apatites and phosphorus. Compared to other calcareous
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2020-11-5 Apatite: From Crystals to Phosphate Rock. Phosphate rock, which consists largely of microcrystalline apatite-group minerals, is the basis of a multi-billion-dollar mining industry. (Wikimedia Commons) With their stubby, terminated, hexagonal prisms, glassy transparency, and soft, yellow-to-greenish-yellow or blue colors, apatite crystals are a ...
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The residual value of phosphorus from superphosphate, crandallite rock phosphate (Christmas Island C-grade ore), 500°C calcined crandallite rock phosphate (Calciphos) and apatite rock phosphate from Queensland, Australia, was measured in a 6 year field experiment sited on lateritic soil in south-western Australia. Different amounts of each fertilizer were applied at the commencement of the ...
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2010-8-9 leaching. Phosphate leached from guano phosphatizes the underlying rocks in some areas, forming apatite where the host rock is limestone and forming aluminum- or aluminum-iron-phosphate minerals where the underlying rock is a silicate. Individual
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2 天前 The role of intracellular calcium phosphate in osteoblast-mediated bone apatite formation Suwimon Boonrungsimana, Eileen Gentlemana,b,c, Raffaella Carzanigad, Nicholas D. Evansa,b,1, David W. McComba,e, Alexandra E. Portera,2, and Molly M. Stevensa,b,f,2 Departments of aMaterials and fBioengineering, bInstitute of Biomedical Engineering, and dElectron Microscopy Centre, Division of
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The concentration of phosphorus in glassy melt inclusions and rehomogenized nanogranitoids suggests a strong control of melt aluminosity on apatite solubility in peraluminous granites, which is consistent with existing experimental studies.
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The weathering of apatite, the primary phosphorus sink in Earth's exosphere, controls long-term phosphorus availability. If phosphorus is the ultimate controlling nutrient over geologic time ...
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2020-11-5 Apatite: From Crystals to Phosphate Rock. Phosphate rock, which consists largely of microcrystalline apatite-group minerals, is the basis of a multi-billion-dollar mining industry. (Wikimedia Commons) With their stubby, terminated, hexagonal prisms, glassy transparency, and soft, yellow-to-greenish-yellow or blue colors, apatite crystals are a ...
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2005-5-1 In parallel, observation of the material by electron microscopy was used to give more precision information about the mechanisms involved. This work reveals the strong chemical affinity between apatites and phosphorus. Compared to other calcareous
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2021-9-19 Phosphorus (P) is a highly-reactive, poisonous, nonmetallic element (see nonmetal) that occurs naturally in phosphates, notably apatite (Ca 3 (PO 4) 2).It was discovered by Hennig Brand in Hamburg in 1669 (Fig 1). The name comes from the Greek phosphorus, meaning "bringer of light," because it glows in the dark.It is the eleventh most common element in the Earth's crust.
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Phosphorus is a vital macronutrient that profoundly influences global oceanic primary production on both modern and geologic time scales (1, 2).Over the past several decades, the residence time of phosphorus in the ocean has been repeatedly revised downwards as previously unidentified sedimentary sinks have been discovered (1, 3).Among these sinks are ubiquitous fine-grained authigenic apatite ...
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2019-4-19 phosphorus minerals include apatite, strengite, and variscite. The secondary phosphorus minerals include calcium (Ca), iron (Fe), and aluminum (Al) phosphates. The release of phosphorus from this pool is extremely slow and occurs when the mineral weathers and dissolves in soil water.
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2018-6-28 Apatite is commonly very insoluble in its original state as extracted from the earth and is practically unavailable as a plant phosphorus source. 7 For this reason, drastic chemical processing
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2019-4-30 Earlier the original source of phosphorus (P) fertilizer was bones; as time passes, the supply of P fertilizer will get exhausted. Today, rock phosphate is the only raw material in the form of P fertilizers. There are two types of rock phosphates: igneous
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2019-3-29 Phosphorus (P) Cycling in Crop Production Systems. Phosphorus is an essential element for all forms of life. Phosphorus in the earth’s crust is mostly contained in soils and sed\൩ments. Soils contain both organic and inorganic P containing compounds. Phosphorus reactions in
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