Determination of the component mass ratio and moisture in BTTN/NG nitrate ester mixture simultaneously by qNMR and method validation

AbstractNew observations of the eclipsing binary system V1848 Ori were carried out using the V filter resulting in a determination of new times of minima and new ephemeris were obtained. We presented the first complete analysis of the system’s orbital period behavior and analysis of O-C diagram done by the GA and MCMC approaches in OCFit code. The O-C diagram demonstrates a sinusoidal trend in the data; this trend suggests a cyclic change caused by the LITE effect with a period of 10.57 years and an amplitude of 7.182 minutes. It appears that there is a third body with mass function of f (m3) = 0.0058 M⊙ in this binary system. The light curves were analyzed using the Wilson-Devinney code to determine some geometrical and physical parameters of the system. These results show that V1848 Ori is a contact W UMa binary system with the mass ratio of q = 0.76 and a weak fillout factor of 5.8%. The O’Connell effect was not seen in the light curve and there is no need to add spot.

Download Full-text

Theoretical progress in the H2+ molecular ion: towards electron to proton mass ratio determinationThis paper was presented at the International Conference on Precision Physics of Simple Atomic Systems, held at École de Physique, les Houches, France, 30 May – 4 June, 2010.

Canadian Journal of Physics ◽

10.1139/p10-065 ◽

2011 ◽

Vol 89 (1) ◽

pp. 103-107 ◽

Cited By ~ 10

Author(s):

J.-Ph. Karr ◽

L. Hilico ◽

V. I. Korobov

Keyword(s):

High Resolution ◽

Mass Ratio ◽

Theoretical Determination ◽

Atomic Systems ◽

The Road ◽

Theoretical Progress ◽

Proton Mass ◽

Accuracy Level ◽

Ratio Determination

High resolution ro-vibrational spectroscopy of H 2+ or HD+ can lead to a significantly improved determination of the electron to proton mass ratio me/mp if the theoretical determination of transition frequencies becomes sufficiently accurate. We report on recent theoretical progress in the description of the hyperfine structure of H 2+ , as well as first steps in the evaluation of radiative corrections at order mα7. Completion of the latter calculation should allow us to reach the projected 10−10 accuracy level and open the road to mass ratio determination.

Download Full-text

Measurement of progesterone in sheep using a commercial ELISA kit for human plasma

Journal of Veterinary Diagnostic Investigation ◽

10.1177/10406387211043513 ◽

2021 ◽

pp. 104063872110435

Author(s):

Valeria Pasciu ◽

Maria Nieddu ◽

Elena Baralla ◽

Cristian Porcu ◽

Francesca Sotgiu ◽

...

Keyword(s):

Enzyme Immunoassay ◽

Human Plasma ◽

Method Validation ◽

Plasma Progesterone ◽

Freeze Thaw ◽

Elisa Kit ◽

Stability Data ◽

Human Use ◽

Species Specific

Determination of serum or plasma progesterone (P4) concentrations is important to recognize pregnant and non-pregnant ewes, and also to predict the number of carried lambs. The 2 most common methodologies for the detection of plasma P4 are radioimmunoassay (RIA) and enzyme immunoassay (EIA). RIA is very expensive, and not all laboratories are equipped to perform this test; EIA is commercially available for human use, but only a few companies produce species-specific kits, which are expensive. We verified for ovine plasma a less expensive and easily available ELISA kit (DiaMetra) designed to quantify P4 in humans. Pools of ovine and human plasma were used to compare repeatability, accuracy, sensitivity, and stability of P4 measured by the DiaMetra kit. Repeatability data were within 15%, and accuracy values were ~90% for both plasma matrices. Stability data showed a loss of <20% for freeze–thaw and <30% for 30-d storage. All parameters were acceptable under international guidelines for method validation. The human ELISA kit was used successfully to quantify plasma P4 in 26 ewes during pregnancy until delivery. P4 concentrations were also correlated with the number of carried lambs.

Download Full-text

Analytical Method Validation and Determination of Iron and Phosphorus in Vegetable Oil by Inductively Coupled Plasma–Mass Spectrometry with Microwave Assisted Digestion

Analytical Letters ◽

10.1080/00032719.2017.1387554 ◽

2018 ◽

Vol 51 (11) ◽

pp. 1774-1788 ◽

Cited By ~ 2

Author(s):

Rizwan Shariff ◽

Ayyappan A. Aachary ◽

Lawrence H. Pacquette ◽

Ashutosh K. Mittal ◽

Rajesh Girdhar

Keyword(s):

Mass Spectrometry ◽

Method Validation ◽

Analytical Method ◽

Inductively Coupled Plasma ◽

Analytical Method Validation ◽

Inductively Coupled ◽

Microwave Assisted ◽

Plasma Mass Spectrometry ◽

Microwave Assisted Digestion

Download Full-text

Method Validation and Determination of Leachable Metals from Infusion and Transfusion Medical Devices

Brazilian Journal of Analytical Chemistry ◽

10.30744/brjac.2179-3425.ar-67-2021 ◽

2021 ◽

Author(s):

Alexandra Schuh ◽

Dirce Pozebon

Keyword(s):

Method Validation ◽

Medical Devices ◽

Inductively Coupled Plasma ◽

Optical Emission ◽

Emission Spectrometry ◽

Icp Oes ◽

Inductively Coupled ◽

Sample Extract ◽

Plasma Optical Emission Spectrometry

This work deals with method validation for regulated metals (Cd, Pb, Ba, Sn, Cr and Cu) determination in infusion and transfusion medical devices. The investigated metals were extracted with water at (37 ± 1) °C followed by their determination in the extract by using inductively coupled plasma optical emission spectrometry (ICP-OES). The validated method was applied in the analysis of infusion and transfusion devices commercialized in Brazil to verify compliance with current legislation, which establishes that the sum of Pb, Ba, Sn, Cr and Cu in the extract must not exceed 1 mg L-1 and that of Cd must not 0.1 mg L-1. Samples from five manufacturers of infusion and transfusion devices, produced in Brazil or imported, were analysed. The results of the analysis showed that all devices complied with the legislation, whereas the sum of Pb, Ba, Sn, Cr and Cu concentrations and that of Cd in the extract were lower than the maximum permissible; Cd was not detected in any sample extract and the sum of the other elements was < 0.14 mg L-1 in all extracts of the analysed samples.

Download Full-text