Analysis of total inositol phosphates in municipal solid waste compost-treated soils by two extraction methods |
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Authors: | P R Warman M D Munroe |
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Institution: | (1) Department of Environmental Sciences, Scotia Agricultural College, Truro, Nova Scotia, Canada B2N 5E3 e-mail: pwarman@cox.nsac.ns.ca Fax: +1-902-8931404, CA |
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Abstract: | Humic substances are the most dynamic component of agricultural soils. In this study, humic substances were extracted from
soils based on standard acid/base solubility and by gel filtration using Sephadex G25. Organic P is a component of humic substances,
and inositol phosphates are considered to have high prominence in organic P. The objectives of the study were to determine
the effects of municipal solid waste (MSW) compost on the amount of inositol phosphates (IP) present in soils, and compare
methods of extracting humic substances from soils. Total IP (IPT) in soil extracts was determined following separation using a AG-1× 8 anion exchange resin, acid digestion and ICAP analysis
for P. The percentage of IP (%IP) of the total P in the soil was also determined by colorimetric analysis. The soils were
part of an experiment to study the effects of three rates of MSW compost and fertilizers on three crops grown in a Pugwash
sandy loam (Humo-Ferric Podzol). The data were compared using ANOVA atP≤0.05; extraction methods, fractions humic/fulvic, high/low molecular (MW)], and five treatments (three different rates of
compost, fertilizer, and untreated soil) were compared. The gel filtration method extracted significantly more IPT and %IP than the solubility method. In the solubility method, humic and fulvic acids contained the same amounts of IPT and %IP, while the high MW fraction always contained more IPT and %IP than the low MW fraction in the gel filtration method. Fulvic acids and the low MW fraction contained similar amounts
of IPT and %IP. There were differences in %IP between compost-treated soils and the non-compost-treated soils, although there were
no differences in IPT due to rate of compost addition.
Received: 20 October 1999 |
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Keywords: | Fulvic/Humic acids Humic substances Inositol phosphate Molecular weight fractions MSW compost |
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