Study of the Adsorption of Polyaromatic Hydrocarbon Binary Mixtures on Carbon Materials by Gas-Phase Fluorescence Detection

2003 ◽  
Vol 17 (3) ◽  
pp. 669-676 ◽  
Author(s):  
A. M. Mastral ◽  
T. García ◽  
R. Murillo ◽  
M. S. Callén ◽  
J. M. López ◽  
...  
Keyword(s):  
Gas Phase ◽  
Binary Mixtures ◽  
Fluorescence Detection ◽  
Carbon Materials ◽  
Polyaromatic Hydrocarbon

Theory of gas–gas phase transition in rare‐gas binary mixtures

1996 ◽  
Vol 105 (5) ◽  
pp. 2020-2027 ◽  
Author(s):  
Lidia Strigari ◽  
Mauro Rovere ◽  
Bruno D’Aguanno
Keyword(s):  
Phase Transition ◽  
Gas Phase ◽  
Binary Mixtures ◽  
Rare Gas

scholarly journals Enhanced heterogenous hydration of SO 2 through immobilization of pyridinic-N on carbon materials

2020 ◽  
Vol 7 (8) ◽  
pp. 192248
Author(s):  
Longhua Zou ◽  
Ping Yan ◽  
Peng Lu ◽  
Dongyao Chen ◽  
Wei Chu ◽  
...  
Keyword(s):  
Gas Phase ◽  
Energy Barrier ◽  
Carbon Materials ◽  
Water Concentration ◽  
Flue Gases ◽  
Doped Graphene ◽  
Molecular Dynamics Results ◽  
Pyridinic N ◽  
Pyridinic Nitrogen

Carbon materials doped with nitrogen have long been used for SO 2 removal from flue gases for the benefits of the environment. The role of water is generally regarded as hydration of SO 3 which is formed through the oxidization of SO 2 . However, the hydration of SO 2 , especially on the surface of N-doped carbon materials, was almost ignored. In this study, the hydration of SO 2 was investigated in detail on the pyridinic nitrogen (PyN)-doped graphene (GP) surfaces. It is found that, compared with the homogeneous hydration of SO 2 assisted with NH 3 in gas phase, the heterogeneous hydration is much more thermodynamically and kinetically favourable. Specifically, when a single H 2 O molecule is involved, the energy barrier for SO 2 hydration is as low as 0.15 eV, with 0.59 eV released, indicating the hydration of SO 2 can occur at rather low water concentration and temperature. Thermodynamic integration molecular dynamics results show the feasibility of the hydrogenated substrate recovery and the immobilized N acting as a catalytic site for SO 2 hydration. Our findings show that the heterogeneous hydration of SO 2 should be universal and potentially uncover the puzzling reaction mechanism for SO 2 catalytic oxidation at low temperature by N-doped carbon materials.

Critical and maximum temperatures of coexistence of liquid and gas phase in hydrocarbons binary mixtures. I. Critical (vapour–liquid) temperatures of alkane binary mixtures

2014 ◽  
Vol 368 ◽  
pp. 14-38 ◽  
Author(s):  
Tatyana N. Nesterova ◽  
Sergey V. Vostrikov ◽  
Igor A. Nesterov ◽  
Alyanus G. Nazmutdinov ◽  
Sergey E. Sosin
Keyword(s):  
Gas Phase ◽  
Binary Mixtures ◽  
Maximum Temperatures

scholarly journals HPLC-fluorescence detection for assay of tramadol binary mixtures with ibuprofen or chlorzoxazone in tablets and plasma: Analytical Eco-Scale and GAPI tools for green assessment

2021 ◽  
Author(s):  
Mohamed M.A. Hamdy ◽  
Mona M. Abdel Moneim
Keyword(s):  
Binary Mixtures ◽  
Fluorescence Detection ◽  
Analytical Procedure ◽  
Gradient Elution ◽  
Dosage Forms ◽  
Hplc Method ◽  
Sample Treatment ◽  
Spiked Plasma ◽  
Water Ph ◽  
Higher Sensitivity

AbstractTramadol, a strong pain killer known for its addictive problems is either co-administrated or co-formulated with other analgesics or muscle relaxants. The power of fluorescence detection in HPLC is tested to resolve such mixtures in plasma matrix to reach the required sensitivity with simple sample treatment using just protein precipitation. The aim of this work was to develop an eco-friendly and sensitive HPLC method with fluorimetric detection for analysis of Tramadol in its two binary mixtures with Ibuprofen (mixture 1) and Chlorzoxazone (mixture 2) in two combined dosage forms and spiked plasma. Separation was done using a C18 column with mobile phase of acetonitrile and water (pH 3.5) in gradient elution and 1 mL/min flow rate. Detection was carried out with λ excitation/λ emission of 220 and 307 nm, respectively. The method was applied to detect the two binary mixtures in real plasma samples after invivo application to rats, to assure that the drugs’ metabolites do not affect the sensitivity or selectivity of the assay. Evaluation of greenness of the proposed method was done using semi-quantitative Eco‐Scale and new Green Analytical Procedure Index which showed that this method can be a greener alternative with higher sensitivity for analysis of both mixtures. The method (15 min-assay) was linear over concentrations of 0.1–10 μg/mL and 0.1–33 μg/mL in plasma. In addition, the proposed method was validated per ICH as well as FDA bioanalytical methods’ validation guidelines.

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