Validation of Soil Phosphate Removal by Alkaline and Acidic Reagents in a Vertosol Soil using XANES Spectroscopy

Autor:	M. K. Tighe, Anton Tadich, Cassandra R. Schefe, Bruce C. C. Cowie, Timothy I. McLaren, Richard J. Flavel, Christopher Guppy
Rok vydání:	2015
Předmět:	Chemistry Inorganic chemistry Soil Science Sulfuric acid Hydrochloric acid Vertisol Phosphate XANES chemistry.chemical_compound Sodium hydroxide Reagent Solubility Agronomy and Crop Science Nuclear chemistry
Zdroj:	Communications in Soil Science and Plant Analysis. 46:1998-2017
ISSN:	1532-2416 0010-3624
DOI:	10.1080/00103624.2015.1048252
Popis:	There is a paucity of information on the soil phosphorus (P) forms removed by alkaline and acidic reagents in Vertosols. The first aim of this study was to identify which soil phosphates are removed by a two-step sequential fractionation (0.1 M NaOH and 1 M HCl) and by a dilute acid extractant (0.005 M H2SO4; Bureau of Sugar Experiment Stations (BSES) soil P test) on an “untreated” Vertosol using P K-edge x-ray absorption near-edge structure (XANES) at the Australian Synchrotron. There was supporting evidence that the 0.1 M sodium hydroxide (NaOH), 1 M hydrochloric acid (HCl), and 0.005M sulfuric acid (H2SO4) extractants remove soil phosphates according to the chemical solubility of known P minerals. The XANES spectra revealed the 1 M HCl and 0.005 M H2SO4 extractants remove calcium (Ca) phosphates from Vertosols, suggesting the latter extractant could be used as an alternative for a rapid and cost-effective measure of Ca phosphates in Vertosols.
Databáze:	OpenAIRE
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