Photodegradation of bifenthrin and deltamethrin—effect of copper amendment and solvent system

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• 作者：Saadia Rashid Tariq ; Dildar Ahmed ; Amna Farooq…
• 关键词：Bifenthrin ; Copper ; Deltamethrin ; Solvents
• 刊名：Environmental Monitoring and Assessment
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：189
• 期：2
• 全文大小：
• 刊物类别：Earth and Environmental Science
• 刊物主题：Monitoring/Environmental Analysis; Environmental Management; Ecotoxicology; Atmospheric Protection/Air Quality Control/Air Pollution; Ecology;
• 出版者：Springer International Publishing
• ISSN：1573-2959
• 卷排序：189

文摘

The photodegradation of bifenthrin and deltamethrin was studied in the presence of Cu salts and two different solvents, methanol and acetonitrile. Results of the study showed that in the absence of any metal salt, the two pesticides degraded more rapidly in acetonitrile than in methanol. After 24 h of UV irradiation, 70% of deltamethrin had degraded in acetonitrile, while only 41% bifenthrin degraded in this solvent. In methanol, bifenthrin degraded at a much enhanced rate than in acetonitrile while the rate of degradation of deltamethrin was comparable to that in acetonitrile. The photodegradation was further enhanced by the addition of copper to the solution of bifenthrin and deltamethrin in acetonitrile. The rate of photodegradation of deltamethrin increased from 2.4 × 10−2 to 3.5 × 10−2 h−1 in acetonitrile and 2.5 × 10−2 to 3.4 × 10−2 h−1 in methanol after the addition of copper. Similarly, the rate of photodegradation of bifenthrin was increased from 5.0 × 10−3 to 9.0 × 10−3 h−1 in acetonitrile and 7.0 × 10−3to 9.05 × 10−3 h−1 in methanol with the addition of copper. Thus, copper has the potential to enhance the photodegradation of bifenthrin and deltamethrin in both the solvents.