A Photodegradation Study of Three Common Paint and Plaster Biocides under monochromatic UV Light

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Abstract

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.
Original languageEnglish
Title of host publicationProceedings of the 13th International Conference on Urban Drainage
Number of pages8
Place of PublicationSarawak, Malaysia
PublisherThe International Conference on Urban Drainage
Publication date2014
Publication statusPublished - 2014
EventThe International Conference on Urban Drainage - Borneo Convention Centre Kuching (BCCK), Sarawak, Malaysian Borneo, Kuching, Malaysia
Duration: 7 Sep 201412 Sep 2014
Conference number: 13

Conference

ConferenceThe International Conference on Urban Drainage
Number13
LocationBorneo Convention Centre Kuching (BCCK), Sarawak, Malaysian Borneo
Country/TerritoryMalaysia
CityKuching
Period07/09/201412/09/2014

Bibliographical note

Proceedings pub. on a usb.

Keywords

  • Photodegradation
  • Diuron
  • Carbendazim
  • Terbutryn
  • Stormwater

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