Analytical and Toxicological Studies of Decomposition of Insecticide Parathion after Gamma-Irradiation and Ozonation

Abstract

The decomposition of the widely used organophosphorus pesticide parathion was carried out in aqueous solutions by the use of gamma-irradiation from a 60Co source or ozonation by means of an ozone generator, and by combined processes of ozonation and radiolysis. Factors affecting the parathion decomposition as well formation and decomposition of the main by-products, including irradiation dose, length of ozonation time, and presence of common scavengers, were investigated. The most efficient was found to be the gamma-irradiation process combined with a short ozonation period; about 1 kGy irradiation dose was sufficient to decompose the pesticide in 15 mg/L solutions. Chemical studies of the decomposition of parathion were accompanied by monitoring of toxicity changes of irradiated solutions with the Microtox test.

Removal of dissolved organic pollutants from water by gamma-irradiation based advanced oxidation processes (AOPs)

“…Toxicity increases with the processes ozonation combined with irradiation and decreases with further irradiation doses or ozonation times. When parathion solution only ozonized, an increase of toxicity with ozonation time was observed [45].…”

Using a quantum dot bead-based lateral flow immunoassay to broadly detect the adulteration of PDE-5 inhibitors in functional foods

“…[21][22][23] Meanwhile, uorescent systems with signal amplication and magnetic nano-materials with strong enrichment ability have been introduced in the LFIA to enhance the sensitivity. [24][25][26] Quantum dots are known for their broad excitation spectra, narrow emission spectra, and large molar attenuation coefficient. 27,28 Therefore, quantum dot nanobeads (QBs) where QDs were embedded can be used as an outstanding uorescencelabeling material to improve the detection sensitivity of the LFIA.…”