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https://hdl.handle.net/2440/44977
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Type: | Journal article |
Title: | Investigating chemical constraints to the measurement of phosphorus in soils using diffusive gradients in thin films (DGT) and resin methods |
Author: | Mason, S. Hamon, R. Zhang, H. Anderson, J. |
Citation: | Talanta, 2008; 74(4):779-787 |
Publisher: | Elsevier Science BV |
Issue Date: | 2008 |
ISSN: | 0039-9140 1873-3573 |
Statement of Responsibility: | Sean Mason, Rebecca Hamon, Hao Zhang and Jenny Anderson |
Abstract: | The effect of potential chemical constraints on the performance of two relatively new soil P testing methods, anion exchange membrane (AEM) and diffusive gradients in thin films (DGT), were evaluated. Exposures to ranges of anion (Cl−, NO3−, SO42− and HCO3−) concentrations relevant to agricultural soils had minimal effect on P recoveries using DGT. It has also been shown previously that DGT P recoveries are unaffected by varying pH (3–9). In contrast, increasing NO3− and SO42− concentrations in solution reduced the recovery of P using the resin method (anion exchange membrane, AEM) by 24% at 50 mg L−1 NO3− and by 47% at 12 mg L−1 SO42− when the P concentration of the test solution was 2 mg L−1. Phosphorus sorption by the resin decreased with increasing Cl− concentrations until there was a 100% decrease at 300 mg L−1 Cl− when the P concentration of the test solution was 2 mg L−1 and a 92% reduction at 700 mg L−1 Cl− when the P concentration of the test solution was 0.2 mg L−1. There was also a small but significant effect of carbonate species on P sorption to the resin at carbonate concentrations that can occur in agricultural soils. Changing the pH of the solution had minimal effects on the resin P measurements in solutions above pH 4, but below pH 4, resin P measurements decreased dramatically. A poor coefficient of determination for the regression fit between DGT and resin measurements on eight agricultural soils suggested that these two methods are measuring different amounts of P for different soils. Resin P measurements increased significantly, but non-uniformly across soils, when the soil:water ratio was decreased but this did not result in an improved relationship with DGT P. There was a minimal effect on measured P using either Cl− or HCO3− as counter ions on the resin. |
Keywords: | Phosphorus extraction Soil testing Diffusive gradients in thin films Anion exchange membranes |
Description: | Available online 16 July 2007. |
Rights: | Copyright © 2007 Elsevier B.V. All rights reserved. |
DOI: | 10.1016/j.talanta.2007.07.005 |
Description (link): | http://www.elsevier.com/wps/find/journaldescription.cws_home/525438/description#description |
Published version: | http://dx.doi.org/10.1016/j.talanta.2007.07.005 |
Appears in Collections: | Aurora harvest 6 Soil and Land Systems publications |
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