Decomposition of Acenaphthylene by Ultrasonic Irradiation

Abstract

Polycyclic aromatic hydrocarbons were extracted from a soil sample using ultrasound and dichloromethane-, cyclohexane-, and toluene-water mixtures. It was found that when dichloromethane is used as an extractant, acenaphthylene reacts with the solvent. Several chlorinated and oxygenated derivatives were identified. The results show that chlorinated solvents should be avoided because of their sonolytic decomposition. Particularly unsaturated nonaromatic compounds might react with intermediate decomposition radicals of the solvent.

Simultaneous determination of maneb and its main metabolites in tomatoes by liquid chromatography using diode array ultraviolet absorbance detection

“…This was probably due to the decomposition of dichloromethane with ultrasonic irradiation and long mechanical shaking. This behavior has already been reported by several authors [24,25] who suggest that unsaturated non-aromatic compounds react with radicals formed during the decomposition of dichloromethane. Therefore, mechanical shaking was selected for further experiments.…”

Quality control Fourier transform infrared determination of diazepam in pharmaceuticals

“…As it has been reported previously, in other cases [19] this fact seems to be related with damage on the active principle molecules due to the generation of free radicals. Fig.…”

A Review on Polycyclic Aromatic Hydrocarbon (PAH) Emissions from Energy Generation

“…Once solved the sampling system, the next problem to be undertaken is the extraction of the trapped polyaromatic compounds. Extraction methods have used traditional methods such as ultrasonic (17)(18)(19)(20)(21)(22)(23), Soxhlet (18)(19)(20)(22)(23)(24) and other more modern ones such as supercritical fluid extraction (25)(26)(27)(28)(29). The effect of sonication and Soxhlet extraction on PAH recovery was studied by Stephens et al (20) who obtained higher recoveries in Soxhlet extraction for coal stack ash.…”