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Wyszukujesz frazę "metody NMR" wg kryterium: Temat


Wyświetlanie 1-3 z 3
Tytuł:
Application of 1H-NMR relaxometry to the determination of the water content in clay soils
Zastosowanie metody NMR do określenia wilgotności w gruntach spoistych
Autorzy:
Nartowska, E.
Kozłowski, T.
Kolankowska, M.
Powiązania:
https://bibliotekanauki.pl/articles/402547.pdf
Data publikacji:
2015
Wydawca:
Politechnika Świętokrzyska w Kielcach. Wydawnictwo PŚw
Tematy:
water content
clay soils
NMR methods
FID Signal
wilgotność
grunty spoiste
metody NMR
sygnał FID
Opis:
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.
Źródło:
Structure and Environment; 2015, 7, 4; 189-193
2081-1500
Pojawia się w:
Structure and Environment
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effect of the soil granulometric composition on the FID (free induction decay) signal intensity in NMR tests
Wpływ składu granulometrycznego gruntów na intensywność sygnału FID (Free Induction Decay) w badaniach NMR
Autorzy:
Nartowska, E.
Kozłowski, T.
Kolankowska, M.
Powiązania:
https://bibliotekanauki.pl/articles/402181.pdf
Data publikacji:
2016
Wydawca:
Politechnika Świętokrzyska w Kielcach. Wydawnictwo PŚw
Tematy:
non cohesive soil
well and poorly sorted soil
granulometric composition
NMR methods
FID Signal cooling
grunt niespoisty
dobrze i źle posortowane gleby
skład granulometryczny
metody NMR
Opis:
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.
Źródło:
Structure and Environment; 2016, 8, 2; 111-115
2081-1500
Pojawia się w:
Structure and Environment
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Oznaczanie związków fosforu w matrycach roślinnych
Determination of phosphorus compounds in plant tissues
Autorzy:
Żyszka-Haberecht, Beata
Wieczorek, Dorota
Lipok, Jacek
Powiązania:
https://bibliotekanauki.pl/articles/1413210.pdf
Data publikacji:
2021
Wydawca:
Polskie Towarzystwo Chemiczne
Tematy:
fosfor
tkanki roślinne
oznaczanie
metody analityczne
NMR
phosphorus
plant tissues
determination
analytical methods
Opis:
The variety of the chemical forms of phosphorus compounds occurring in plant tissues, accompanied by the complexity of the chemical composition of plants as the analytical matrices, are the reasons why there is no one, the best answer, how those individual substances may be determined qualitatively and quantitatively. Interestingly, if the subject of determination is the total phosphorus content, the spectrum of effective methods and techniques seems to be impressive. However, in case of spectrophotometric measurements and classical variants of absorption (FAAS) or emission (ICP-AES/ ICP-OES) spectrometry techniques, it is necessary at first to isolate various phosphorus forms from the matrix, and then to mineralize them prior determination. The development of combined methods e.g. ETV-ICP- AES or HR-ETAAS, does allow the isolation of the phosphorus analyte and its detection in a kind of “one step” analytical procedure, directly in plant tissues. Similar benefits, while maintaining the sensitivity of determinations, are brought by the use of XRF, SIMS or nanoSIMS - more expensive techniques of imaging the presence of phosphorus in biological matrices. In turn, the application of nuclear magnetic resonance spectroscopy, especially the 31P NMR technique is thought to be the most universal approach. Using this technique and being aware of higher limit of detection, it is possible to determine various plant phosphorus compounds qualitatively and quantitatively, at the same time.
Źródło:
Wiadomości Chemiczne; 2021, 75, 7-8; 1017-1038
0043-5104
2300-0295
Pojawia się w:
Wiadomości Chemiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-3 z 3

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