Proton Nuclear Magnetic Resonance (NMR) Relaxometry in Soil Science Applications~!2009-05-04~!2010-01-25~!2010-06-18~!

Bayer, Julia V.; Jaeger, Fabian; Schaumann, Gabriele E.

doi:10.2174/1874769801003020015

Cited by 3 publications

(4 citation statements)

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“…3). Apart from some results reported earlier, 8,10 these data showed that the water permeated into the samples at the desiccator atmosphere was not free bulk water but an effectively adsorbed surface water, as aqueous transverse relaxation in pore volumes normally gives T 2 from tens of milliseconds up to several seconds. 17,18 This fact was also confirmed by the relatively minor water uptake that was less than 5% of thurizing.…”

Section: Resultsmentioning

confidence: 62%

“…8 This leads to an effective reduction of both spin-lattice and spin-spin relaxation times. 10 Biofilms formed in macro pores of soils 11 contain a large variety of microbiological organisms including bacteria, algae, and fungi. During their life cycle, while filtering rain water and consuming atmospheric vapor, their cell walls adsorb a perceptible amount of metal ions arising from pollution agents that are dissolved in water flowing through the soil humus.…”

Section: Introductionmentioning

confidence: 99%

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The use of ¹H-NMR Relaxation Times of Water Adsorbed on Soils to Monitor Environment Pollution

Grunin

Nikolskaya

Edwards

2013

Air, Soil and Water Research

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Pursuing the goal to develop an express technique for the characterizing of forest ecology, this paper presents a description of the found dependence of nuclear magnetic resonance (NMR) relaxation times of water in soils on the pollution caused by vehicle exhausts. Test measurements were made in Mari El Republic of Russia where wildwood areas located close to human activity are showing degradation, which has drastically intensified in the resent several years. Samples were collected at distances between 100 m to 1.1 km from the highway towards the direction of virgin forest assuming that their contamination level was naturally varied. The measured spin-spin NMR relaxation time of wetted samples showed a growth of more than 20% with the increase of distance from the pollution source. Here we try to explain this effect. As the conclusion, we propose to use the transverse relaxation time of moisturized soil as an indicator for the environment pollution monitoring.

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Section: Resultsmentioning

confidence: 62%

Section: Introductionmentioning

confidence: 99%

The use of ¹H-NMR Relaxation Times of Water Adsorbed on Soils to Monitor Environment Pollution

Grunin

Nikolskaya

Edwards

2013

Air, Soil and Water Research

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“…In both wells, T 2 distributions measured Days 6–12 show a single peak, on the order of 10 1 ms. The transition to shorter relaxation times is an indication of biofilm accumulation. ,, Data collected on Day 15 after flushing and bleaching each well shows a return to the bimodal T 2 distribution that typified the system prior to biofilm growth.…”

Section: Resultsmentioning

confidence: 98%

In Situ Detection of Subsurface Biofilm Using Low-Field NMR: A Field Study

Kirkland

Herrling

Hiebert

et al. 2015

Environ. Sci. Technol.

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Subsurface biofilms are central to bioremediation of chemical contaminants in soil and groundwater whereby micro-organisms degrade or sequester environmental pollutants like nitrate, hydrocarbons, chlorinated solvents and heavy metals. Current methods to monitor subsurface biofilm growth in situ are indirect. Previous laboratory research conducted at MSU has indicated that low-field nuclear magnetic resonance (NMR) is sensitive to biofilm growth in porous media, where biofilm contributes a polymer gel-like phase and enhances T2 relaxation. Here we show that a small diameter NMR well logging tool can detect biofilm accumulation in the subsurface using the change in T2 relaxation behavior over time. T2 relaxation distributions were measured over an 18 day experimental period by two NMR probes, operating at approximately 275 kHz and 400 kHz, installed in 10.2 cm wells in an engineered field testing site. The mean log T2 relaxation times were reduced by 62% and 43%, respectively, while biofilm was cultivated in the soil surrounding each well. Biofilm growth was confirmed by bleaching and flushing the wells and observing the NMR signal's return to baseline. This result provides a direct and noninvasive method to spatiotemporally monitor biofilm accumulation in the subsurface.

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“…23,24 Theory and numerous other applications are well described in the literature. 15,25 Because relaxometry and FFC have been more widely explored in the context of environmental analysis than NMR spectroscopy, and because they are well described elsewhere, 15,[25][26][27] this study will focus instead on static low-field NMR spectroscopy, which has been seldom applied to environmental samples. For the remainder of the text, the term "low-field NMR" will therefore refer solely to NMR spectroscopy rather than relaxometry techniques.…”

Section: Low-field Nmr Spectroscopymentioning

confidence: 99%

Low‐field, not low quality: 1D simplification, selective detection, and heteronuclear 2D experiments for improving low‐field NMR spectroscopy of environmental and biological samples

Downey,

Bermel,

Soong

et al. 2023

Magnetic Reson in Chemistry

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Understanding environmental change is challenging and requires molecular‐level tools to explain the physicochemical phenomena behind complex processes. Nuclear magnetic resonance (NMR) spectroscopy is a key tool that provides information on both molecular structures and interactions but is underutilized in environmental research because standard “high‐field” NMR is financially and physically inaccessible for many and can be overwhelming to those outside of disciplines that routinely use NMR. “Low‐field” NMR is an accessible alternative but has reduced sensitivity and increased spectral overlap, which is especially problematic for natural, heterogeneous samples. Therefore, the goal of this study is to investigate and apply innovative experiments that could minimize these challenges and improve low‐field NMR analysis of environmental and biological samples. Spectral simplification (JRES, PSYCHE, singlet‐only, multiple quantum filters), selective detection (GEMSTONE, DREAMTIME), and heteronuclear (reverse and CH3/CH2/CH‐only HSQCs) NMR experiments are tested on samples of increasing complexity (amino acids, spruce resin, and intact water fleas) at‐high field (500 MHz) and at low‐field (80 MHz). A novel experiment called Doubly Selective HSQC is also introduced, wherein 1H signals are selectively detected based on the 1H and 13C chemical shifts of 1H–13C J‐coupled pairs. The most promising approaches identified are the selective techniques (namely for monitoring), and the reverse and CH3‐only HSQCs. Findings ultimately demonstrate that low‐field NMR holds great potential for biological and environmental research. The multitude of NMR experiments available makes NMR tailorable to nearly any research need, and low‐field NMR is therefore anticipated to become a valuable and widely used analytical tool moving forward.

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Proton Nuclear Magnetic Resonance (NMR) Relaxometry in Soil Science Applications~!2009-05-04~!2010-01-25~!2010-06-18~!

Cited by 3 publications

References 0 publications

The use of ¹H-NMR Relaxation Times of Water Adsorbed on Soils to Monitor Environment Pollution

The use of ¹H-NMR Relaxation Times of Water Adsorbed on Soils to Monitor Environment Pollution

In Situ Detection of Subsurface Biofilm Using Low-Field NMR: A Field Study

Low‐field, not low quality: 1D simplification, selective detection, and heteronuclear 2D experiments for improving low‐field NMR spectroscopy of environmental and biological samples

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Proton Nuclear Magnetic Resonance (NMR) Relaxometry in Soil Science Applications~!2009-05-04~!2010-01-25~!2010-06-18~!

Cited by 3 publications

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The use of 1H-NMR Relaxation Times of Water Adsorbed on Soils to Monitor Environment Pollution

The use of 1H-NMR Relaxation Times of Water Adsorbed on Soils to Monitor Environment Pollution

In Situ Detection of Subsurface Biofilm Using Low-Field NMR: A Field Study

Low‐field, not low quality: 1D simplification, selective detection, and heteronuclear 2D experiments for improving low‐field NMR spectroscopy of environmental and biological samples

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The use of ¹H-NMR Relaxation Times of Water Adsorbed on Soils to Monitor Environment Pollution

The use of ¹H-NMR Relaxation Times of Water Adsorbed on Soils to Monitor Environment Pollution