%0 Journal Article
%9 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES
%A Waithaisong, K.
%A Robin, A.
%A Martin, A.
%A Clairotte, M.
%A Villeneuve, Manon
%A Plassard, C.
%T Quantification of organic P and low-molecular-weight organic acids in ferralsol soil extracts by ion chromatography
%D 2015
%L fdi:010064794
%G ENG
%J Geoderma
%@ 0016-7061
%K Organic P forms ; Low-molecular-weight organic acids ; Soil extract ; Single-run separation ; IC quantification
%K BRESIL
%M ISI:000357355500012
%N SI
%P 94-101
%R 10.1016/j.geoderma.2014.12.024
%U https://www.documentation.ird.fr/hor/fdi:010064794
%> https://www.documentation.ird.fr/intranet/publi/2015/08/010064794.pdf
%V 257
%W Horizon (IRD)
%X A better understanding of the composition of organic phosphorus (organic P) and low-molecular-weight organic acids (LMWOAs) in soil will make it possible to predict phosphorus cycling, improve biomass production and help phosphorus management in forest plantations. The method for quantifying organic P and LMWOAs in soil extracts was developed using ion chromatography (IC). Sodium hydroxide (0.5 N) was validated as an extractant for both organic P and LMWOAs. A mixture of 200 mM NaOH and ultrapure water was used to create a linear gradient elution. The eluent program separated five different organic P forms (glucose-6-phosphate, AMP, fructose-1,6-bisphosphate, ATP and phytate) as well as pyrophosphate from inorganic P (Pi), and four LMWOAs (malate, malonate, oxalate and citrate) in a 25 minute run through an AS11 column. The variability of the quantification was expressed as the relative standard deviation which was less than 20% for most of the analytes. The recovery rate of organic P assayed by IC to colorimetry was 110 +/- 20%. This chromatographic method was shown to be suitable for the quantification of organic P and LMWOAs in soil samples and could be an easier alternative to P-31 Nuclear Magnetic Resonance (NMR) measurement.
%$ 068