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| Home > Publications database > Effects of Salt Precipitation in the Topmost Soil LayerInvestigated by NMR |
| Journal Article | FZJ-2024-01318 |
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2023
Springer
Wien [u.a.]
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Please use a persistent id in citations: doi:10.1007/s00723-023-01568-1
Abstract: The drying of highly concentrated aqueous salt solutions in sand and soil has beeninvestigated by one-dimensional spatially resolved low-field relaxation measurementsof 1H nuclei in water as well as high-field MRI of 1H and 23Na nuclei ofwater and sodium ions. Water evaporates until the solutions in the solid matrix reachsaturation conditions, when salt begins to crystallize. Depending on salt type andconditions, such as actual soil water content and air humidity, this crystallizationcan occur above (efflorescent) or below (subflorescent) the soil surface. Both effectsoccur in nature and affect the evaporation behavior of water. The formation of saltprecipitate domains is demonstrated by MRI, where the precipitate domains remainpenetrable to water. Complete drying is achieved in the top 2 mm of soil with theexception of strongly hygroscopic perchlorates which maintain a constant amountof liquid water under ambient laboratory conditions and dry air. This situation isconsidered similar to the co-existence of perchlorates and water in strongly eutecticmixtures on Mars.
Keyword(s): Geosciences (2nd)
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