Results 251 to 260 of about 44,529 (307)
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Environmental Technology, 1995
The photodegradation of pesticides was investigated on adsorbed phases: silica, kaolin, bentonite and on a standard soil. Kinetic results show that the photodegradation of phenmedipham is dependant on the nature of the support. On silica and bentonite the degradation is immediate while the photodegradation is slow on kaolin and standard soil. Also, the
S. Guittonneau, F. Khelifi, P. Meallier
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The photodegradation of pesticides was investigated on adsorbed phases: silica, kaolin, bentonite and on a standard soil. Kinetic results show that the photodegradation of phenmedipham is dependant on the nature of the support. On silica and bentonite the degradation is immediate while the photodegradation is slow on kaolin and standard soil. Also, the
S. Guittonneau, F. Khelifi, P. Meallier
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Photodegradable formulations of DDT
Experientia, 1976The incorporation of diphenylamine and diethylaniline in commercial DDT-WDP formulations sprayed on Phaseolus aureus and Tabernaemontana coronaria revealed that both these chemicals enhanced the initial rate of loss of DDT. Both these sensitizers exhibited no immediate adverse effect on the storage stability, pH, sieve requirement and colour of the ...
B S, Parmar, S Y, Pandey, S K, Mukerjee
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Photodegradation paths of cefotaxime
Journal of Pharmaceutical Sciences, 1988The degradation kinetics of cefotaxime sodium salt in aqueous solution, under UV light at 254 nm, was investigated by HPLC and antibiotic activity. This degradation is the result of two competitive processes, an isomerization and a photolysis. This study is mostly about the isomerization step.
D A, Lerner +4 more
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Photodegradation of Cassava and Corn Starches [PDF]
Journal of Agricultural and Food Chemistry, 2001 The baking expansion properties of sour cassava starch (Polvilho azedo) are attributable to photochemical starch degradation induced by heterolactic fermentation after sun-drying. This study investigated the effects of UV irradiation on the different structural levels of cassava starch as compared to those of corn starch and dextrins.
Bertolini, A.C. +5 more
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Photodegradation of pesticides - VII Photodegradation of carbetamide - photoproducts
Chemosphere, 1993The Photochemical degradation of the herbicide Carbetamide in different solvents has been investigated. The photoproducts were characterised by spectroscopic methods and also identified by comparison with synthetic samples. The pathway of formation of the photoproducts is described.
P. Méallier, A. Mamouni, M. Mansour
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Photodegradation of pesticides on adsorbed phases photodegradation of carbetamid
Chemosphere, 1993Abstract The photochemical characteristics of carbetamid herbicide adsorbed on different solid supports were investigated. No significant difference was found for λ max and triplet state of carbetamid, however, the structural properties such as specific area and reflection coefficient are very different for each support.
C. Emmelin +3 more
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Photodegradation of Chlorpromazine Hydrochloride
Journal of Pharmaceutical Sciences, 1964The quantum efficiency of chlorpromazine hydrochloride (CLP HCI) at 253.5 m μ in aqueous media (pH 1.5) was 0.18 and 0.14 under normal and oxygen-free atmospheres, respectively. The quantum efficiency remained constant within the concentration range and periods of irradiation studied, but increased at pH values above 4.5.
A, FELMEISTER, C A, DISCHER
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Photodegradation of phosphonates in water
Chemosphere, 2005Phosphonates are widely used as chelating agents, e.g., in water cooling systems, in bleaching baths or as scale inhibitors in deflocculation agents. They are considered to be difficult to degrade and produce aminomethylphosphonic acid (AMPA) as a metabolite. As the fate of phosphonates in the environment is not very well known the present work aims at
Céline, Lesueur +2 more
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Photodegradation of diafenthiuron in water
Pest Management Science, 2002AbstractDiafenthiuron, 1‐tert‐butyl‐3‐(2,6‐di‐isopropyl‐4‐phenoxyphenyl)thiourea, is an effective insecticide and acaricide. Sunlight degradation of diafenthiuron in various aqueous solutions and pure hexane yielded two major identified products: 1‐tert‐butyl‐3‐(2,6‐di‐isopropyl‐4‐phenoxyphenyl)carbodiimide (CGA‐140 408) and 1‐tert‐butyl‐3‐(2,6‐di ...
Young-Soo, Keum +4 more
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Journal of Polymer Science Part A-1: Polymer Chemistry, 1972
AbstractUnique photodegradable polyamides have been prepared by solution polymerization of diphenyl α‐truxillate or δ‐truxinate with hexamethylene or nonamethylenediamine, followed by melt polymerization. Photochemical properties of resulted polyamides were studied spectroscopically and are discussed in terms of photoreversibility and monomeric ...
Hiroshi Takahashi +3 more
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AbstractUnique photodegradable polyamides have been prepared by solution polymerization of diphenyl α‐truxillate or δ‐truxinate with hexamethylene or nonamethylenediamine, followed by melt polymerization. Photochemical properties of resulted polyamides were studied spectroscopically and are discussed in terms of photoreversibility and monomeric ...
Hiroshi Takahashi +3 more
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