Results 251 to 260 of about 1,920,414 (308)

Kinetics of the chemical degradation of diuron

Chemosphere, 2002
The influence of pH and buffer concentration on the chemical degradation of diuron in water has been analysed over a wide temperature range. The process irreversibly gives 3,4-dichloroaniline as the only product containing the phenyl ring. H+, OH- and phosphate buffer are efficient catalysts of the reaction. The rate constant first increases rapidly at
SALVESTRINI, Stefano, DI CERBO P, CAPASSO S.   +2 more
openaire   +3 more sources

Degradation of ofloxacin by potassium ferrate: kinetics and degradation pathways

Environmental Science and Pollution Research, 2022
Drug residues, including various antibiotics, are being increasingly detected in aqueous environments. Ofloxacin (OFX) is one such antibiotic that is widely used in the treatment of several bacterial infections; however, chronic exposure to this antibiotic can have adverse impacts on human health.
Yanghan, Chen, Qiuye, Jin, Zhaomin, Tang
openaire   +2 more sources

Degradation kinetics of metronidazole in solution

Journal of Pharmaceutical Sciences, 1993
The degradation kinetics of metronidazole in aqueous solutions of pH 3.1 to 9.9 under accelerated storage conditions were studied. The stability of metronidazole in solutions containing propylene glycol or polyethylene glycol 400 was also investigated. The reaction order for metronidazole in these aqueous and solvent systems followed pseudo-first-order
D P, Wang, M K, Yeh
openaire   +2 more sources

The kinetics of the alkaline degradation of daptomycin

Journal of Pharmaceutical Sciences, 2001
The aqueous degradation of daptomycin, a lipopeptide antibiotic, was investigated as a function of substrate concentration (0.5-10.0 mM), pH (9.0-10.5), buffer concentration (0.06-0.20 M borate, glycinate, or carbonate buffers), temperature (20-50 degrees C), and ionic strength (0.1-0.8).
W, Muangsiri, L E, Kirsch
openaire   +2 more sources

Kinetics of Contaminant Degradation by Permanganate

Environmental Science & Technology, 2005
To provide a more complete understanding of the kinetics of in situ chemical oxidation (ISCO) with permanganate (MnO4-), we measured the kinetics of oxidation of 24 contaminants-many for which data were not previously available. The new data reported here were determined using an efficient method based on continuous measurement of the MnO4 ...
Rachel H, Waldemer, Paul G, Tratnyek
openaire   +2 more sources

Kinetics of Degradation of Biapenem

International Journal of Chemical Kinetics, 2014
ABSTRACTThe kinetic and thermodynamic analysis of biapenem degradation was conducted during acid–base hydrolysis, under the influence of buffer components and in the solid state at increased temperature (dry air) and relative air humidity (RH > 50%).
JUDYTA CIELECKA‐PIONTEK, PRZEMYSŁAW ZALEWSKI, PIOTR GARBACKI, EWELINA JURA, ALICJA TALACZYŃSKA   +4 more
openaire   +1 more source

Kinetics of polymer degradation

Macromolecules, 1986
Equations cinetiques pour trouver des solutions explicites aux modeles discrets et en continu de fragmentation pour deux classes de modeles de probabilite de scission ...
Robert M. Ziff, E. D. McGrady
openaire   +1 more source

Degradation Kinetics of Neostigmine in Solution

Drug Development and Industrial Pharmacy, 2000
The degradation kinetics of neostigmine were studied in aqueous solutions with varied pH from 1.5 to 9.9 under accelerated storage conditions. The stability of neostigmine in solutions containing propylene glycol or polyethylene glycol 400 was also investigated.
openaire   +2 more sources

Degradation Kinetics of Diltiazem

Drug Development and Industrial Pharmacy, 1990
AbstractThe kinetics of degradation of diltiazem hydrochloride in aqueous buffered solutions (pH 1-7) were studied. Diltiazem was found to undergo hydrolysis to desacetyldiltiazem. The decomposition of diltiazem followed pseudo-first order kinetics under the experimental conditions.
M. S. Suleiman, M. E. Abdulhameed, N. M. Najib, H. Y. Muti   +3 more
openaire   +1 more source

KINETICS OF TRITHIONATE DEGRADATION

Canadian Metallurgical Quarterly, 2006
Abstract Thiosulfate has shown promise as an alternative to cyanide for gold leaching. However, one of the limitations is high thiosulfate consumption. Thiosulfate degradation is not completely understood. Of the degradation products, trithionate is a concern in the resin recovery of gold and is persistent in solution.
N. AHERN, D. DREISINGER, G. VAN WEERT
openaire   +1 more source