Cyanuric acid, photodegradation

The increased rates of photodegradation of the triazine herbicides observed in the presence of naturally occurring sensitizers indicate that photodegradation plays a significant role in the dissipation of these herbicides in natural waters. With most of the sensitizers studied thus far, cyanuric acid was the stable end product, rather than complete mineralization of the triazine herbicide. 

Fig. 7. Photodegradation of cyanuric acid (CA) at 4.0% H2[PtCl6]/TH upon irradiation through the cut-off filter of 320 nm as monitored by disappearance of cyanuric acid (squares) and by the change of total organic carbon content (circles) and formation of NO<( (triangles). Initial parameters pH = 9, [CA]0 = 0.25 mmol L 1.

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