scholarly journals Indicators and regularities of hydrolytic decomposition of metastable aluminate solutions in the Na2O – K2O – Al2O3 – H2O system

2021 ◽  
pp. 27-32
Author(s):  
V. N. Brichkin ◽  
A. T. Fedorov
Keyword(s):  
Hydrolytic Decomposition

scholarly journals The investigation of primary physicochemical and pharmaco-biological properties of polynuclear iron(III) complexes with dextran and its derivatives

2005 ◽  
Vol 11 (1) ◽  
pp. 30-35
Author(s):  
Dragan Cvetkovic ◽  
Vesna Nikolic ◽  
Ljubisa Nikolic
Keyword(s):  
Acute Toxicity ◽  
Acidic Medium ◽  
Carbonic Acid ◽  
Biological Properties ◽  
Human Medicine ◽  
Application Site ◽  
Neutral Medium ◽  
A Value ◽  
Hydrolytic Decomposition

The results of the investigations of primary physicochemical and pharmaco-biological properties of polynuclear iron(III) complexes with low molecular dextran (LMD), hydrogenated low molecular dextran (H-LMD) and dextran carbonic acid (DCA) are presented. The investigations included the complex resistance to hydrolytic decomposition in highly acidic medium, the (TFH-A)-value, and neutral medium at 120?C, the (TFH-120)-value, the viscosity of the parenteral solutions, iron(III) resorption dynamics to serum after the i.m. and i.v. application of the preparation to rabbits, the acute toxicity (LD50) in mice, and the residual iron(III) quantity at the i.m. application site. Iron(III) complexes with dextran carbonic acid (DCA) appeared to be the most suitable for use in veterinary and human medicine.

scholarly journals Reasons for Reduced Moisture Resistance of Sulfur-Extended Asphalt Concrete

Materials ◽  
2021 ◽  
Vol 14 (23) ◽  
pp. 7218
Author(s):  
Huu Tuan Le ◽  
Evgenij V. Korolev ◽  
Anna N. Grishina ◽  
Vitaly A. Gladkikh
Keyword(s):  
Asphalt Concrete ◽  
Water Soluble ◽  
Moisture Resistance ◽  
Physical Processes ◽  
Capillary Structure ◽  
Hydrolytic Decomposition ◽  
Magnesium Salts ◽  
Calcium And Magnesium ◽  
Sulfur Containing ◽  
Decomposition Of Water

The paper presents the results of a study of the mechanism for reducing the moisture resistance of sulfur-extended asphalt concrete. It is shown that a decrease in moisture resistance occurs due to the occurrence of chemical and physical processes. At the same time, it was found that during the manufacture of sulfur-bitumen composites, toxic gases H2S and SO2 are formed, which are capable of interacting with a mineral filler, as well as the interaction of sulfur with a mineral powder with the formation of sulfur-containing water-soluble salts, the extraction of which leads to a decrease in the moisture resistance of sulfur-bitumen materials. The change in the rate of leaching of these substances from the composite is due to the physical process caused by the crystallization of sulfur and the formation of a capillary structure, which significantly increases the rate of leaching of calcium and magnesium salts, which are products of dissolution or hydrolytic decomposition of water-soluble products of the interaction of sulfur, H2S and SO2 gases with calcium and magnesium carbonates. The intensity of chemical and physical processes intensifies with an increase in the amount of sulfur in sulfur-bitumen materials.

Sign in / Sign up

Export Citation Format

Share Document