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quantum yield neonicotinoid

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https://www.readbyqxmd.com/read/29345468/photochemistry-of-solid-films-of-the-neonicotinoid-nitenpyram
#1
Kifle Z Aregahegn, Michael J Ezell, Barbara J Finlayson-Pitts
The environmental fates of nitenpyram (NPM), a widely used neonicotinoid insecticide, are not well known. A thin solid film of NPM deposited on a germanium attenuated total reflectance (ATR) crystal was exposed to radiation from a low-pressure mercury lamp at 254 nm, or from broadband low pressure mercury photolysis lamps centered at 350 or 313 nm. The loss during photolysis was followed in time using FTIR. The photolysis quantum yields (), defined as the number of NPM molecules lost per photon absorbed, were determined to be (9...
January 18, 2018: Environmental Science & Technology
https://www.readbyqxmd.com/read/27989110/photochemistry-of-thin-solid-films-of-the-neonicotinoid-imidacloprid-on-surfaces
#2
Kifle Z Aregahegn, Dorit Shemesh, R Benny Gerber, Barbara J Finlayson-Pitts
Imidacloprid (IMD) is the most widely used neonicotinoid insecticide found on environmental surfaces and in water. Analysis of surface-bound IMD photolysis products was performed using attenuated total reflectance Fourier transfer infrared (ATR-FTIR) analysis, electrospray ionization (ESI-MS), direct analysis in real time mass spectrometry (DART-MS), and transmission FTIR for gas-phase products. Photolysis quantum yields (ϕ) for loss of IMD were determined to be (1.6 ± 0.6) × 10(-3) (1s) at 305 nm and (8...
March 7, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/20131836/photodegradation-of-novel-nitromethylene-neonicotinoids-with-tetrahydropyridine-fixed-cis-configuration-in-aqueous-solution
#3
Xianfeng Zhao, Xusheng Shao, Zhuyan Zou, Xiaoyong Xu
Photodegradation of 1-((6-chloropyridin-3-yl)methyl)-7-methyl-8-nitro-1,2,3,5,6,7-hexahydroimidazo[1,2-a]pyridin-5-ol (IPPA152001) and 1-((6-chloropyridin-3-yl)methyl)-7-methyl-8-nitro-5-propoxy-1,2,3,5,6,7-hexahydroimidazo[1,2-a]pyridine (IPPA152004) was studied in distilled water; high-pressure mercury lamp and xenon lamp were used as light sources. The photolytic rate constants of the two compounds and their half-lives were calculated. Compared with imidacloprid, the order of photodegradation rate of three compounds was as follows: imidacloprid > IPPA152001 > or = IPPA152004...
March 10, 2010: Journal of Agricultural and Food Chemistry
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