A simple and selective approach for determination of titanium dioxide in double base solid propellants: methodology for method validation

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.

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Determination of the number of vanadium = oxygen species on the surface of vanadium oxide catalysts. 2. Vanadium pentoxide/titanium dioxide catalysts

The Journal of Physical Chemistry ◽

10.1021/j150616a016 ◽

1981 ◽

Vol 85 (16) ◽

pp. 2372-2377 ◽

Cited By ~ 51

Author(s):

Makoto Inomata ◽

Akira Miyamoto ◽

Yuichi Murakami

Keyword(s):

Titanium Dioxide ◽

Vanadium Oxide ◽

Vanadium Pentoxide ◽

Oxide Catalysts ◽

Oxygen Species

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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

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Experimental and Theoretical Study on Three Combustion Models for the Determination of the Performance Parameters of Nitrocellulose - Based Propellants

Revista de Chimie ◽

10.37358/rc.20.9.8320 ◽

2020 ◽

Vol 71 (9) ◽

pp. 87-97

Author(s):

Titi Paraschiv ◽

Tudor Viorel Tiganescu ◽

George Ovidiu Iorga ◽

Raluca Elena Ginghina ◽

Octavian Constantin Grigoroiu

Keyword(s):

Chemical Composition ◽

Energetic Materials ◽

Specific Volume ◽

Flame Temperature ◽

Performance Parameters ◽

Heat Of Explosion ◽

Combustion Gases ◽

Combustion Models ◽

Double Base

Nitrocellulose based propellants are the main materials used for ballistic and rocket applications. The chemical composition of the propellants, the loading density and propellant grain geometry are the decisive parameters that influence the performance parameters in ballistic application. In this paper the authors evaluate three models of combustion for energetic materials for the determination of heat of explosion and specific volume together with the adiabatic flame temperature. The authors select six types of propellant (two simple base propellants, two double base propellants based on nitroglycerine and two triple base propellants based on nitroguanidine) and the authors determined the heat of explosion and specific volume using a bomb calorimeter and a Julius-Peters device. The results obtained from the combustion models were compared to the experimental results and assumptions were done on the influence of pressure and temperature on the chemical composition of combustion gases produced by the confined deflagration of nitrocellulose-based propellants.

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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.

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