الفهرس 
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Abstract
|The main conclusions which can be deduced from this study, in which seem to be original, can be summarized as follows:
initial concentration of the three PAHs in the aqueous media may 1 their levels of photodegradation potentials. This was more pronounced of perylene and christen than benzo(a)pyrene.
;ver the starting concentration of each of the tested compounds, the of its concentration is usually eliminated from its aqueous medium, photodegradation, during the first hour of the experiment. Moreover, t all of the three used chemicals were disappeared from their media after
[present results indicated also that, during the first hour, the more rapid jradable compound in natural aerated sea water was perylene while the was benzo(a)pyrene. Although these two compounds are of the same weight and number of benzene rings, they differed in their rates of imposition. Therefore, it is not only the level of concentration of in their media, is the limiting factor, but also the stereochemistry of the ad plays a significant role in the process.