The comparison of solvents effect on photolysis of PCB compounds for reducing their hazards in environment
Arak Medical University Journal (AMUJ) Original Article Summer
Due to concerns over the negative impacts of PCB compounds on environment and their persistence, their production, use, and import has been banned in some countries. More recently, the Chemical Treaty on Persistent Organic Pollutants (POPs) has listed PCBs among priority chemicals for eventual elimination by 2025. The aim of this study was to determine the effect of solvents on the photodegradation of askarel oils using photolysis for reducing their hazards. Materials and Methods: The
... hods: The photochemical reactor, used in this experimental trial, was based on photolysis through UV/ H 2 O 2 with a 500 ml beaker and low-pressure mercury lamp with a wavelength of 254 nm. The lamp was immersed in the beaker. The temperature and PH of the samples were constantly monitored. The experiments were repeated three times. Askarel oils were analyzed by GC/ECD. Results: The means of degradation of total PCBs due to the use of lamp for ethanol solvent and isooctane were 88% and 77%, respectively. The mean degradation of total PCBs in terms of the applied solvent ratio to the oil transformer for 1:1, 2:1, and 3:1 values for ethanol and isooctane were 55%, 85%, and 88%, and 40%, 77%, and 78%, respectively. Conclusion: Photolysis of PCB compounds in the presence of ethanol solvents, isoocatnes with strong oxidants such as H 2 O 2 , indicated their degradation or reduction in oil transformers with lower energy, and no yield of toxic byproducts. There was a significant difference in the employment of ethanol solvent and isooctane in degradation of askarel oil.