scholarly journals PHYSICAL AND CHEMICAL INVESTIGATION OF THE AUTHENTICITY OF PARACETAMOL

2021 ◽  
pp. 161-166
Author(s):  
Кристина Сергеевна Шачнева ◽  
Надежда Владимировна Баранова ◽  
Мариана Александровна Феофанова
Keyword(s):  
Ir Spectroscopy ◽  
Chemical Investigation ◽  
Medicinal Preparations ◽  
Physical And Chemical

Подтверждено наличие п-ацетаминофена методами спектрофотометрическим и ИК-спектроскопии в лекарственных препаратах. The presence of p-acetaminophen was confirmed by spectrophotometric and IR-spectroscopy methods in medicinal preparations

Universal Approach for Determination of Physical and Chemical Properties of Water by Near-IR Spectroscopy

1993 ◽  
Vol 47 (10) ◽  
pp. 1720-1727 ◽  
Author(s):  
Jie Lin ◽  
Chris W. Brown
Keyword(s):  
Ir Spectroscopy ◽  
Chemical Properties ◽  
Fiber Optic Sensor ◽  
Universal Method ◽  
Physical And Chemical Properties ◽  
Near Ir ◽  
Universal Approach ◽  
Physical And Chemical ◽  
And Chemical Properties

Near-IR spectroscopy has been investigated as a universal approach for determination of physical and chemical properties of water and their functions of temperature. Principal component regression and multilinear regression models were used to correlate the spectra with the properties of water at temperatures between 5 and 65°C. Fifteen properties of water were investigated including density, refractive index, dielectric constant, relative viscosity, surface tension, vapor pressure, sound velocity, isothermal compressibility, thermal expansivity, thermal capacity, thermal conductivity, enthalpy, free energy, entropy, and ionization constant. Very good correlations were found between the near-IR predicted values of all the properties and those obtained by the traditional methods. This investigation demonstrates that these fifteen properties of water can be simultaneously determined simply by measuring a set of near-IR spectra of water, and, thus, near-IR spectroscopy can be used as a universal method for the determinations of physical and chemical properties of water. Remote sensing of the properties can be performed with the use of a fiber-optic sensor.

IR spectroscopy of physical and chemical transformations in cold hydrogen chloride and ammonia aerosols

2009 ◽  
Vol 11 (36) ◽  
pp. 7853 ◽  
Author(s):  
Evan G. Robertson ◽  
Chris Medcraft ◽  
Ljiljana Puskar ◽  
Rudolf Tuckermann ◽  
Chris D. Thompson ◽  
...  
Keyword(s):  
Ir Spectroscopy ◽  
Hydrogen Chloride ◽  
Chemical Transformations ◽  
Physical And Chemical

Preparation and Characterization of LLM-105 Cocrystal Explosives

2014 ◽  
Vol 900 ◽  
pp. 251-255 ◽  
Author(s):  
Shu Hai Zhang ◽  
Hai Long Zhao
Keyword(s):  
Melting Point ◽  
Ir Spectroscopy ◽  
Chemical Properties ◽  
Physical And Chemical Properties ◽  
Physical And Chemical ◽  
And Chemical Properties

Cocrystal explosive can effectively improve the physical and chemical properties of explosive and contributed to new unique properties of cocrystal explosive. Based on cocrystal principle, a few recrystallization explosives of LLM-105 were prepared using solvent/non-solvent technique. The prepared samples were analyzed by IR spectroscopy. The results showed that cocrystals such as LLM-105/ HNIW, LLM-105/HMX and LLM-105/RDX can be prepared. Melting point and density of the cocrytals above changed little. It can be inferred the cocrystal explosive will have better energy and their application performances will not reduce obviously.

X. On the chemical and physical conditions of the culture of cotton

1862 ◽  
Vol 11 ◽  
pp. 340-352
Keyword(s):  
North America ◽  
Cotton Plant ◽  
Chemical Investigation ◽  
Indian Government ◽  
Physical Conditions ◽  
The Government ◽  
Physical And Chemical

This communication embraces the first portion of an elaborate physical and chemical investigation, in which the author has been and is still engaged, upon the scientific conditions involved in the success­ful agriculture of the cotton plant. To this train of research he has brought peculiar advantages, holding his professorial chair in the great otton-growing State of Alabama (North America), having been the ditor of the Government Geological Report of that State, and having had placed at his disposal (for experiment and comparison) by the Indian Government, a magnificent collection, specially made, of the various cotton soils and plants of India, as well as the like from other Powers.

A physical and chemical investigation of the nature and properties of the species formed in the Hg(63P1)–CO system

1970 ◽  
Vol 48 (9) ◽  
pp. 1420-1431 ◽  
Author(s):  
G. London ◽  
A. C. Vikis ◽  
D. J. Le Roy
Keyword(s):  
Carbon Monoxide ◽  
Rate Constants ◽  
Chemical Investigation ◽  
Enhancement Effect ◽  
Quenching Rate ◽  
Physical Measurements ◽  
Quenching Process ◽  
Excimer Formation ◽  
Physical And Chemical

An investigation of the Hg(63P1)–CO system by physical measurements (emission, pressure studies) relevant to the reported Hg*CO species have yielded no additional evidence of its formation.Chemical experiments on the decomposition of ethylene and H2 are in accord with formation of a long lived (> 10−5 s) species. The relative quenching rate constants of the species by C2H4, H2, and CO are 1:0.10–0.18:0.023, respectively.The reliability of the "carbon monoxide effect" as a criterion for distinguishing the nature of the quenching process is discussed in the light of a CO enhancement effect (~ 30%) observed in the Hg(63P1) photosensitized decomposition of hydrogen in the presence of CO and at conditions of incomplete quenching. An alternative to Hg*CO excimer formation is also discussed. This approach is based on the possible formation of Hg(63P0) atoms in quantities in excess of those currently accepted, when Hg–CO mixtures are irradiated with 2537 Å light.

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