Organophosphorus photodegradation

Organophosphorus compounds Phosphites are the main organophosphorus compounds used to control oxidative degradation of lubricants. They eliminate hydroperoxides, peroxy and alkoxy radicals, retard the darkening of lubricants over time and also limit photodegradation. These performance characteristics may be of importance for polyalphaolefins, hydrocracked or severely hydrotreated base stocks and white oils. 

Kamiya, M. and Kameyama, K. (2001) Effects of selected metal ions on photodegradation of organophosphorus pesticides sensitised by humic acids. Chemosphere 45, 231-235. 

Bavcon Kralj M, Franko M, Trebse P (2006) Photodegradation of organophosphorus insecticides - Investigations of products and their toxicity using gas chromatography-mass spectrometry and AChE-thermal lens spectrometric bioassay. Chemosphere 67(1) 99-107... 

On the other hand, Kamiya et al. [43] observed an increased photodegradation of eleven organophosphorus pesticides in humic water after complexation to a-, p-, and y-CyDs. They concluded that the promotion effects of CyDs towards photodegradation were attributable to their inclusion-trapping abilities, which are active not only to the pesticides, but also to photoradical species, such as superoxide and hydroxyl radicals, discharged by the photosensitization action of humic acids. 

The organophosphorus herbicide butamifos and its 4-nitrophenyl derivative were submitted to photodegradation. Products were analysed by APCI-LC-MS. 

The plant cuticle represents a complex surface containing compounds that may act as photosensitizers, quenchers and potential reaction partners. Most studies of the phototransformation of organophosphorus insecticides on leaf surfaces ignored the structure of the plant cuticle and employed surrogate surfaces which cannot provide dependable predictive information. Schynowski and Schwack (49) found a strong correlation between the olefinic content of fruit cuticles and photodegradation rate of parathion. 

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