A new solution 31 P NMR sample preparation scheme for marine sediments

2017 ◽  
Vol 15 (4) ◽  
pp. 381-393 ◽  
Author(s):  
Delphine Defforey ◽  
Barbara J. Cade-Menun ◽  
Adina Paytan
Keyword(s):  
Sample Preparation ◽  
Marine Sediments ◽  
Nmr Sample Preparation

scholarly journals Sample preparation for determination of comminution ages in lacustrine and marine sediments

2018 ◽  
Vol 479 ◽  
pp. 123-135 ◽  
Author(s):  
Alexander Francke ◽  
Sally Carney ◽  
Patrick Wilcox ◽  
Anthony Dosseto
Keyword(s):  
Sample Preparation ◽  
Marine Sediments

Submicro Scale NMR Sample Preparation for Volatile Chemicals

2004 ◽  
Vol 30 (11) ◽  
pp. 2153-2161 ◽  
Author(s):  
Satoshi Nojima ◽  
David J. Kiemle ◽  
Francis X. Webster ◽  
Wendell L. Roelofs
Keyword(s):  
Sample Preparation ◽  
Volatile Chemicals ◽  
Nmr Sample Preparation

Vacuum and Pressure System for NMR Sample Preparation

1963 ◽  
Vol 34 (8) ◽  
pp. 944-944 ◽  
Author(s):  
Robert A. Cacciarelli ◽  
Burch B. Stewart
Keyword(s):  
Sample Preparation ◽  
Pressure System ◽  
Nmr Sample Preparation

Triaxial Test Study on Marine Sediments Sample with Simulated Combustible Ice

2014 ◽  
Vol 580-583 ◽  
pp. 376-379
Author(s):  
Xiao Liang Wang ◽  
Guang Fan Li ◽  
Juan Du
Keyword(s):  
Mechanical Properties ◽  
Mechanical Property ◽  
Sodium Chloride ◽  
Sample Preparation ◽  
Marine Sediments ◽  
Triaxial Test ◽  
Soil Mechanics ◽  
Clean Energy ◽  
Test Method ◽  
Test Study

Combustible ice is a kind of efficient and clean energy that has the potential to be exploited in the future, exploiting combustible ice needs to understand its mechanical properties. Combustible ice is another important feature of soil which is different from soil, in order to correctly understand the distinction, this paper using soil mechanics triaxial test method, to study the mechanical properties of combustible ice. Different from previous study, this article put forward the concept of simulated combustible ice, namely through baking powder, sodium chloride, and Marine sedimentary soil to simulate flammable ice, explore a new method for sample preparation to study the mechanical property of combustible ice.

scholarly journals A Triple Layer of Immiscible Solvents for NMR Sample Preparation: Enhanced Sensitivity and Reduced Deuterated Solvent for Observation of Heteronuclei

2019 ◽  
Author(s):  
Bikash Baishya ◽  
Atish Chandra
Keyword(s):  
Sample Preparation ◽  
Signal To Noise Ratio ◽  
Bottom Part ◽  
Enhanced Sensitivity ◽  
Magnetic Field Homogeneity ◽  
Field Homogeneity ◽  
Nmr Sample Preparation ◽  
Set Up ◽  
The Magnetic Field ◽  
Sample Dilution

<p>Organic chemistry labs routinely perform NMR in a standard 5 mm NMR tube. NMR sample is prepared by filling the lowermost 4 cm length of a regular 5 mm 0.d. tube that holds approximately 0.55 ml of a deuterated solvent. This is actually a sample dilution procedure as the signal mainly comes from the central part, i.e. 1.8 cm length sample that fits the typical coil length of 1.8 cm in regular NMR spectrometers. The diluted top and bottom part of the sample is away from the coil and contributes less signal. This dilution procedure amplifies the requirement of expensive deuterated solvent and lowers sensitivity. The present study explores a new way of sample preparation which involves sandwiching a small amount of the deuterated solvent (D<sub>2</sub>O) of length 1.8 cm containing the analyte between two non-deuterated solvents (CCl<sub>4</sub> at bottom of length ≈ 1 cm and similarly C<sub>6</sub>H<sub>6</sub> at top), which are immiscible with the former using a regular 5 mm o.d. NMR tube in such a way that total length is still 4 cm as demanded by the magnetic field homogeneity considerations. The analyte now being closer to NMR coil dissolved in 1.8 cm solvent, improves sensitivity and reduces deuterated solvent hitherto required. <sup>13</sup>C and <sup>15</sup>N spectra from such a set-up display two to three-fold higher signal to noise ratio and hence four to eightfold savings in experimental time or faster data collection.</p><br>

scholarly journals Quy trình gia công và phân tích hóa thạch Tảo vôi, áp dụng cho các trầm tích ven biển tỉnh Sóc Trăng

2020 ◽  
Vol 19 (4) ◽  
pp. 537-544
Author(s):  
Nguyen Thi Hong Nhung ◽  
Nguyen Thi Thuy ◽  
Nguyen Viet Hien ◽  
Nguyen Huu Manh
Keyword(s):  
Organic Matter ◽  
Calcium Carbonate ◽  
Sample Preparation ◽  
Marine Sediments ◽  
Middle Pleistocene ◽  
Calcareous Nannofossils ◽  
Calcareous Nannofossil ◽  
Sample Analysis ◽  
Smear Slide ◽  
Gephyrocapsa Oceanica

Calcareous nannofossils are very small microfossils composed of calcium carbonate. They are very good biostratigraphic markers within marine sediments by covering the Jurassic to present. The standard preparation of a sample for nannofossil analysis requires the collection of the largest quantity and the best fossils. Sample preparation accords to the following steps: i. Pounding sample; ii. Eliminating organic matter; iii. Washing sample; iv. Filter sample through the sieve; v. Eliminating clay; vi. Drying sample in an incubator; vii. Packing sample. Sample analysis accords to the following steps: i. Preparation of smear - slide; ii. Observation of morphology; iii. Determination; iv. Taking photo; v. Evaluating overall preservation and abundance of fossils; vi. Making analysis result sheet. This process is applied to study calcareous nannofossils within marine sediments in Soc Trang province. It makes much clear to understand middle Pleistocene-early Holocene ecosystem of calcareous nannofossil. In conclusion, this assemblage belongs to NN21 zone by the present of Emiliania huxleyi and Gephyrocapsa oceanica.

Sign in / Sign up

Export Citation Format

Share Document