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The photodegradation of 1,2,3,6-tetrahydro-N-(trichloromethylthio) phthalimide [captan -(CPT)] on apple surfaces by different UV radiation (UV-C -254 nm and full UV spectra – 250 – 750 nm) was investigated. Results obtained demonstrate the UV – light irradiance on apple surfaces has the capability of markedly reducing the concentration of surface sorbed levels of CPT (which is frequently detected on fruit surfaces) through direct and possibly indirect photochemical degradation. The loss of CPT was found to be significant for the experimental conditions described here, with &gt;80% loss of initial concentrations of the test chemical under UV-B &amp; C light within 30 minutes of light exposure. In general, CPT decayed more quickly under the UV A-B compared to UV –C. The rate of degradation (kCPT) was found to be 2.0 x 10-3 and 3.1 x 10-3 min -1 for the Xenon “750 W/m2” and UV-C lamps respectively with corresponding half-lives of 346.5 min and 22.57 min. Photolysis of CPT is usually as a result of the homolytic dissociation of a C-Cl bond.

Comparison on the Effect of different Light Sources on the Fate of 1,2,3,6-tetrahydro-N-(trichloromethylthio) phthalimide Using LCMS