Simultaneous Derivatization and Trapping of Volatile Products from Aqueous Photolysis of Thiamethoxam Insecticide

• Published in: Journal of agricultural and food chemistry 2000-10, Vol.48 (10), p.4671-4675
• Main Authors: Schwartz, Barb J, Sparrow, F. Kay, Heard, Nina E, Thede, Bruce M
• Format: Article
• Language: English
• Subjects: Biological and medical sciences; Chemical control; Chemistry; Control; Exact sciences and technology; Fundamental and applied biological sciences. Psychology; General and physical chemistry; Insecticides - chemistry; Insecticides - radiation effects; Light; Mass Spectrometry; Neonicotinoids; Nitro Compounds - chemistry; Nitro Compounds - radiation effects; Oxazines - chemistry; Oxazines - radiation effects; Photochemistry; Photolysis; Physical chemistry of induced reactions (with radiations, particles and ultrasonics); Phytopathology. Animal pests. Plant and forest protection; Protozoa. Invertebrates; Spectrophotometry, Ultraviolet; Thiamethoxam; Thiazoles
• ISSN: 0021-8561; 1520-5118
• DOI: 10.1021/jf990966y

An aqueous photolysis study was conducted with radiolabeled thiamethoxam, 4H-1,3,5-oxadiazin-2-imine, 3-[(2-chloro-5-thiazolyl)methyl]tetrahydro-5-methyl-N-nitro, to establish the relevance of aqueous photolysis as a transformation process for 14 C-[thiazolyl]-thiamethoxam. 14 C-[thiazolyl]-thiamethoxam was applied to sterile sodium acetate pH 5 buffer solution at a dose rate of approximately 10 ppm. The resulting samples were incubated for up to 30 days at 25 °C under irradiated and nonirradiated conditions. The irradiated samples were exposed to a 12-hour-on and 12-hour-off light cycle. Volatile fractions accounted for up to an average of 56.76% of the total dose for the irradiated incubations and