Pyrolytic gas chromatographic procedure for determination of thermal stability of sulfur-containing additive (dibenzyl disulfide) and composition of additive decomposition products

1977 ◽  
Vol 13 (3) ◽  
pp. 224-227
Author(s):  
N. A. Kudryavtseva ◽  
N. I. Lulova ◽  
A. A. Fufaev ◽  
S. B. Borshchevskii
Keyword(s):  
Thermal Stability ◽  
Additive Decomposition ◽  
Decomposition Products ◽  
Chromatographic Procedure ◽  
Sulfur Containing ◽  
Thermal Stability Of

Determination of the Thermal Stability of Explosives

2021 ◽  
Vol 15 (2) ◽  
pp. 271-277
Author(s):  
G. M. Nazin ◽  
B. L. Korsunskiy
Keyword(s):  
Thermal Stability ◽  
Thermal Stability Of

The thermal stability of sideronatrite and its decomposition products in the system Na2O–Fe2O3–SO2–H2O

2013 ◽  
Vol 40 (8) ◽  
pp. 659-670 ◽  
Author(s):  
Gennaro Ventruti ◽  
Fernando Scordari ◽  
Giancarlo Della Ventura ◽  
Fabio Bellatreccia ◽  
Alessandro F. Gualtieri ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Decomposition Products ◽  
Thermal Stability Of

scholarly journals STUDY OF THERMAL DECOMPOSITION PRODUCTS OF NITROGEN-PHOSPHORUS-POTASSIUM FERTILIZERS BASED ON AMMONIUM NITRATE BY X-RAY DIFFRACTUON

2017 ◽  
Vol 61 (1) ◽  
pp. 72
Author(s):  
Konstantin G. Gorbovskiy ◽  
Alena S. Ryzhova ◽  
Andrey M. Norov ◽  
Denis A. Pagaleshkin ◽  
Valentina N. Kalinina ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Thermal Decomposition ◽  
Phosphoric Acid ◽  
Ammonium Nitrate ◽  
Confined Space ◽  
Decomposition Products ◽  
X Ray ◽  
Thermal Decomposition Products ◽  
Nitrogen Phosphorus ◽  
Thermal Stability Of

Complex mineral ammonium nitrate-based fertilizers are complex multicomponent salt systems possessing low thermal stability and prone to self-sustaining decomposition. This leads to the need to increase the requirements for fire and explosion safety in their manufacture, storage and transportation, caused by the fact that ammonium nitrate is a solid oxidant able to support a combustion, and its heating in confined space can lead to detonation. Components that make up such fertilizers can both reduce (phosphates and ammonium sulfate) and accelerate (chlorine compounds) decomposition of ammonium nitrate. Thus, the thermal stability of fertilizers based on ammonium nitrate largely depends on the ratio of the components that make up its composition or formed as a result of the chemical reaction. The simplest way to reduce the content of ammonium nitrate and increase the thermal stability of fertilizer without changing the content of essential nutrients is to increase the degree of phosphoric acid ammoniation. In this paper, the phase composition change of grade 22:11:11 nitrogen-phosphorus-potassium fertilizer obtained with different ammoniation degree in the process of thermal decomposition was studied by X-ray phase analysis. To obtain this fertilizer, wet-process phosphoric acid obtained sulfuric acid attack of the Khibin apatite concentrate by a hemihydrate method is used. It is shown that an increase in the ammoniation degree has a significant effect on the exothermic decomposition of ammonium nitrate and the amount of material that is released into the gas phase. The phases formed at each stage of the decomposition are determined.Forcitation:Gorbovskiy K.G., Ryzhova A.S., Norov A.M., Pagaleshkin D.A., Kalinina V.N., Mikhaylichenko A.I. Study of thermal decomposition products of nitrogen-phosphorus-potassium fertilizers based on ammonium nitrate by X-ray diffractuon. Izv. Vyssh. Uchebn. Zaved. Khim. Khim. Tekhnol. 2018. V. 61. N 1. P. 72-77

Determination of Aspartame and Its Major Decomposition Products in Foods

1993 ◽  
Vol 76 (2) ◽  
pp. 275-282 ◽  
Author(s):  
Jacques Prodolliet ◽  
Milene Bruelhart
Keyword(s):  
Soft Drink ◽  
Food Additives ◽  
Reversed Phase ◽  
Food Samples ◽  
Phase Detection ◽  
Decomposition Products ◽  
Coefficients Of Variation ◽  
Chromatographic Procedure ◽  
Liquid Chromatographic

Abstract A liquid chromatographic procedure already evaluated in a preceding study for the analysis of acesulfam-K is also suitable for the determination of the intense sweetener aspartame in tabletop sweetener, candy, fruit beverage, fruit pulp, soft drink, yogurt, cream, cheese, and chocolate preparations. The method also allows the determination of aspartame’s major decomposition products: diketopiperazine, aspartylphenylalanine, and phenylalanine. Samples are extracted or diluted with water and filtered. Complex matrixes are centrifuged or clarified with Carrez solutions. An aliquot of the extract is analyzed on a reversed-phase μBondapak C18 column using 0.0125M KH2P04 (pH 3.5)-acetonitrile ([85 + 15] or [98 + 2]) as mobile phase. Detection is performed by UV absorbance at 214 nm. Recoveries ranged from 96.1 to 105.0%. Decomposition of the sweetener was observed in most food samples. However, the total aspartame values (measured aspartame + breakdown products) were within -10% and +5% of the declared levels. The repeatabilities and the repeatability coefficients of variation were, respectively, 1.00 mg/100 g and 1.34% for products containing less than 45 mg/100 g aspartame and 4.11 mg/100 g and 0.91 % for other products. The technique is precise and sensitive. It enables the detection of many food additives or natural constituents, such as other intense sweeteners, organic acids, and alkaloids, in the same run without interfering with aspartame or its decomposition products. The method is consequently suitable for quality control or monitoring.

Colorimetric study of thermal stability of sulfur-containing additives

1979 ◽  
Vol 15 (5) ◽  
pp. 384-386
Author(s):  
N. A. Kudryavtseva ◽  
A. A. Fufaev ◽  
S. B. Borshchevskii ◽  
N. I. Lulova
Keyword(s):  
Thermal Stability ◽  
Colorimetric Study ◽  
Sulfur Containing ◽  
Thermal Stability Of
Sign in / Sign up

Export Citation Format

Share Document