Open AccessCombining diffusive gradients in thin‐films (DGT) and 31 P NMR spectroscopy to determine phosphorus species in soil
Author(s) -
Vogel Christian,
Doolette Ashlea,
Huang Jianyin
Publication year - 2022
Publication title -
agricultural and environmental letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.681
H-Index - 12
ISSN - 2471-9625
DOI - 10.1002/ael2.20068
Subject(s) - diffusive gradients in thin films , adsorption , chemistry , nuclear magnetic resonance spectroscopy , spectroscopy , phosphorus , hydrolysis , elution , analytical chemistry (journal) , environmental chemistry , chromatography , organic chemistry , metal , physics , quantum mechanics
The diffusive gradients in thin‐films (DGT) technique shows in many publications a superior correlation to the amount of plant‐available phosphorus (P) in soil. However, this technique cannot give information on the plant‐available P species in soil. Therefore, we combined DGT with solution 31 P nuclear magnetic resonance (NMR) spectroscopy. This was achieved by using a modified DGT device in which the diffusive layer had a larger pore size, the binding layer incorporated an adsorption material with a higher capacity, and the device had a larger exposure area. The spectroscopic investigation was undertaken after elution of the deployed DGT binding layer in a NaOH solution. Adsorption tests using solutions of known organic P compounds showed that a sufficient amount of these compounds could be adsorbed on the binding layer in order for them to be analyzed by solution 31 P NMR spectroscopy. Furthermore, various intermediates of the hydrolysis of trimetaphosphate in soil could be also analyzed over time. Core Ideas We show a promising combination of DGT technique and solution 31 P NMR spectroscopy. This technique combination can identify organic phosphorus species in solutions. Modified DGT device can analyze the hydrolysis of trimetaphosphate in soil.