Wyniki wyszukiwania - BazTech

Ograniczanie wyników

2 Structure and Environment

Znaleziono wyników: 2

Liczba wyników na stronie

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych: NMR methods

Sortuj według:

Ogranicz wyniki do:

The effect of the soil granulometric composition on the FID (free induction decay) signal intensity in NMR tests

Nartowska E., Kozłowski T., Kolankowska M.

Structure and Environment

2016

Vol. 8, no. 2

111--115

The influence of the soil granulation, grain diameter and the soil type on the FID signal intensity is presented. The FID signal intensity is used to determine the water content in soil sample by the use of the NMR spectrometry. Eighty five samples taken from four different soils (3 sand,1 sandy silt) were tested. The samples were characterized by different masses and water contents. The results of the FID signal intensity were compared to the mass of water in soils calculated by empirical formula obtained for clay soils and the mass of water obtained by the oven-drying method. The empirical formula using FID Signal Intensity can be used to calculate the mass of water in every soil regardless of its type. The type of soil, grain diameter and granulation do not appear to influence the FID Signal Intensity value. The factors that influence the FID Signal Intensity are the mass of water in soil, the water content in case of poorly sorted soils and the mass of soil sample in well sorted soils. The statistical analysis were conducted using Statistica 9.1 software.

Application of 1H-NMR relaxometry to the determination of the water content in clay soils

Nartowska E., Kozłowski T., Kolankowska M.

Structure and Environment

2015

Vol. 7, no. 4

189--193

The NMR technique is widely used in polymer, chemical, and agrifood industries, as well as in many other fields of science and technology. This work presents results from the use of FID (Free Induction Decay) application to determine the water content in clay soil samples. The widely used oven-drying method is time-consuming and precludes using the same sample to another test, because drying process damages the internal structure of soil. Three clay soils, characterized by high surface area, were used in the research and six to eight samples for each soil were tested. The obtained dependence curve between FID Signal Intensities and mass of water was characterized by a high correlation coefficient (R2 = 0.97). The curve can be used to determine the mass of water present in clay soil sample on the basis of FID Signal Intensity. Such approach allows 1H-NMR relaxometry to be applied for the determination of water content in soil samples in a fast and non-destructive way.