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Sequential phosphorus fractionation

Little is known about the relationship between organic phosphorus fractions determined by different quantification methods. From the few experiments where sequential phosphorus fractionation and NMR have been applied together (in bulk soil and in particle size fractions) in the tropics, it appears that phosphate diesters extracted by sodium bicarbonate are labile compounds from microbial biomass and easily decomposable organic matter associated with the sand fraction, while those in sodium hydroxide extracts are microbial... [Pg.248]

Sequential extraction or chemical fractionation techniques have been widely used in the characterization of various phosphorus fractions in soils and sediments, with an emphasis on the more bioavailable or plant-available inorganic forms (Condron et al., 2005). Early extraction procedures (Chang and Jackson, 1957 Williams et al., 1976b) focused on inorganic phosphorus associated with iron, aluminium and calcium, using various acid, base or salt extraction steps. Organic phosphorus was considered to be the residual or refractory phosphorus-containing fraction that remained after all other extractions had been performed. [Pg.2]

S. and Andreu, L. (2000) Calcium- and iron-related phosphorus in calcareous and calcareous marsh soils sequential chemical fractionation and P nuclear magnetic resonance study. Communications in Soil Science and Plant Analysis 31, 2483-2499. [Pg.39]

Total phosphorus determined by sequential fractionation or separate digestion, with organic phosphorus determined as the sum of sequentially extracted organic phosphorus fractions. [Pg.249]

Modified simple sequential inorganic phosphorus fractionation schemes include (1) extraction of soil with neutral salt such as KCl, NaCl, or NH4CI, followed by (2) residual soil extraction with... [Pg.336]

Phosphorus is not a TE but a major nutrient element. Nevertheless, fractionation of this element is essential for environmental studies, and hence it seems reasonable to highlight here some relevant SEPs. Four different procedures for the fractionation of P in lake sediment samples have been tested in an interlaboratory study in the framework of the SM T program (Ruban et al., 1999). As a result, a novel scheme based on the Williams protocol (Williams et al., 1976) has been developed aimed at the restoration of lake sediments. The scheme comprises three separate assays (1) sequential extraction of NaOH-extractable (Fe- and Al-bound) and HCl-extractable (Ca-bound) fractions, (2) sequential extraction of inorganic and organic phosphorus and (3) single extraction, after calcination, of concentrated HCl-extractable (total P) fraction (see Table 12.3 for further details). Further discrimination of specific compounds is made feasible by the use of chromatographic and capillary separation techniques as reviewed by Spivakov et al. (1999). [Pg.487]

J. Buanuama, M. Miro, E.H. Hansen, J. Shiowatana, On-line dynamic fractionation and automatic determination of inorganic phosphorus in environmental solid substrates exploiting sequential injection microcolumn extraction and flow injection analysis, Anal. Chim. Acta 570 (2006) 224. [Pg.421]

Taranto, M.T., Adams, M.A. and Polglase, P.j. (2000) Sequential fractionation and characterisation ( P NMR) of phosphorus-amended soils in Banksia integrifolia (L.f.) woodland and adjacent pasture. Soil Biology and Biochemistry 32, 1 69-1 77. [Pg.43]

In soils and sediments, chemical fractionation or sequential extraction methods offer another approach to speciation of the forms of phosphorus. Traditionally, there has been more emphasis on bioavailable or plant available inorganic forms, e.g., Olsen s extraction used for soils. [Pg.3715]


See other pages where Sequential phosphorus fractionation is mentioned: [Pg.764]    [Pg.263]    [Pg.330]    [Pg.764]    [Pg.263]    [Pg.330]    [Pg.146]    [Pg.306]    [Pg.3]    [Pg.244]    [Pg.245]    [Pg.253]    [Pg.415]    [Pg.494]    [Pg.306]    [Pg.191]    [Pg.174]    [Pg.245]    [Pg.254]    [Pg.256]    [Pg.258]    [Pg.279]    [Pg.315]    [Pg.336]    [Pg.369]    [Pg.489]    [Pg.30]   
See also in sourсe #XX -- [ Pg.2 , Pg.3 , Pg.244 , Pg.245 , Pg.263 ]




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