Photodegradation of the three common paint-and-plaster biocides (carbendazim, diuron and terbutryn) was investigated at controlled laboratory conditions. Samples prepared in two types of water (demineralized water and pond water) were subjected to 254 nm monochromatic UV light. Light intensity (W m-2) in the experimental chamber was measured by a fiber optic spectrometer. The observed decline in biocide concentration was related with the light energy, accumulated during the time of degradation (kJ m-2), and 1st order photodegradation rate constants (m2 kJ-1) were determined. The obtained results demonstrated that diuron and terbutryn were readily degradable at the tested conditions, while carbendazim remained stable throughout the 28 – 34 hours of the experiments. Photodegradation rate constants of diuron and terbutryn were found to be slightly higher in demineralized water (0.0183 – 0.0227 m2 kJ-1 and 0.0279 – 0.0341 m2 kJ-1 for diuron and terbutryn, respectively) compared with pond water (0.0152 – 0.02 m2 kJ-1 and 0.0233 – 0.0283 m2 kJ-1 for diuron and terbutryn, respectively). The findings of this study demonstrate the general photodegradation tendencies of the three biocides at selected laboratory conditions, as well as emphasize the importance of water type when investigating pollutant’s photo fate, as certain constituents might act as reaction enhancers or inhibitors.
|Title of host publication||Proceedings of the 13th International Conference on Urban Drainage|
|Number of pages||8|
|Place of Publication||Sarawak, Malaysia|
|Publisher||The International Conference on Urban Drainage|
|Publication status||Published - 2014|
|Event||The International Conference on Urban Drainage - Borneo Convention Centre Kuching (BCCK), Sarawak, Malaysian Borneo, Kuching, Malaysia|
Duration: 7 Sep 2014 → 12 Sep 2014
Conference number: 13
|Conference||The International Conference on Urban Drainage|
|Location||Borneo Convention Centre Kuching (BCCK), Sarawak, Malaysian Borneo|
|Period||07/09/2014 → 12/09/2014|
Bibliographical noteProceedings pub. on a usb.