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000840140 1001_ $$0P:(DE-Juel1)167455$$aWang, Liming$$b0$$eCorresponding author
000840140 245__ $$aDiffusion-Ordered Nuclear Magnetic Resonance Spectroscopy (DOSY-NMR): A Novel Tool for Identification of Phosphorus Compounds in Soil Extracts
000840140 260__ $$aColumbus, Ohio$$bAmerican Chemical Society$$c2017
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000840140 520__ $$aLiquid-state, one-dimension 31P nuclear magnetic resonance spectroscopy (NMR) has greatly advanced our understanding of the composition of organic phosphorus in the environment. However, the correct assignment of signals is complicated by overlapping and shifting signals in different types of soils. We applied therefore for the first time diffusion-ordered spectroscopy (DOSY) to soil extracts, allowing us to separate phosphorus components in the second domain based on their translational diffusion coefficients. After successful application to a mixture of 14 model compounds, diffusion rates correlated closely with the molecular weight of the individual compound in aqueous solution (R2 = 0.97). The method was then applied to NaOH/EDTA extracts of a grassland soil, of which paramagnetic contaminations were removed with sodium sulfide following high-velocity centrifugation (21 500g, 45 min) at 4 °C. Diffusion rates in soil extracts were again closely related to molecular weight (R2 = 0.98), varying from 163.9 to 923.8 Da. However, our DOSY application failed for a forest soil with low organic phosphorus content. Overall, DOSY did help to clearly identify specific NMR signals like myo- and scyllo-inositol hexakisphosphate. It thus provides a more confident signal assignment than 1D 31P NMR, although currently the ubiquitous use of this novel methodology is still limited to soils with high organic phosphorus content.
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000840140 7001_ $$0P:(DE-Juel1)129427$$aAmelung, Wulf$$b1
000840140 7001_ $$0P:(DE-Juel1)133857$$aWillbold, Sabine$$b2
000840140 773__ $$0PERI:(DE-600)1465132-4$$a10.1021/acs.est.7b03322$$gVol. 51, no. 22, p. 13256 - 13264$$n22$$p13256 - 13264$$tEnvironmental science & technology$$v51$$x1520-5851$$y2017
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