title: Photodegradation of bifenthrin and deltamethrin-effect of copper amendment and solvent system.
abstract: 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 × 10-2to 3.5 × 10-2h-1in acetonitrile and 2.5 × 10-2to 3.4 × 10-2h-1in methanol after the addition of copper. Similarly, the rate of photodegradation of bifenthrin was increased from 5.0 × 10-3to 9.0 × 10-3h-1in acetonitrile and 7.0 × 10-3to 9.05 × 10-3h-1in methanol with the addition of copper. Thus, copper has the potential to enhance the photodegradation of bifenthrin and deltamethrin in both the solvents.
authors.affiliation: Department of Chemistry, Lahore College for Women University, Lahore, Pakistan. saadiartariq@yahoo.com.
authors.forename: Saadia Rashid
authors.initials: SR
authors.lastname: Tariq
authors.affiliation: Department of Chemistry, Forman Christian College, A chartered University, Lahore, Pakistan.
authors.forename: Dildar
authors.initials: D
authors.lastname: Ahmed
authors.affiliation: Department of Chemistry, Lahore College for Women University, Lahore, Pakistan.
authors.forename: Amna
authors.initials: A
authors.lastname: Farooq
authors.affiliation: Department of Chemistry, Lahore College for Women University, Lahore, Pakistan.
authors.forename: Sonia
authors.initials: S
authors.lastname: Rasheed
authors.affiliation: Department of Chemistry, Lahore College for Women University, Lahore, Pakistan.
authors.forename: Mubarkah
authors.initials: M
authors.lastname: Mansoor
mesh_terms: D000097:Acetonitriles / Q000737:chemistry*; D003300:Copper / Q000737:chemistry; D004784:Environmental Monitoring; D000432:Methanol / Q000737:chemistry*; D009570:Nitriles / Q000378:metabolism*; D010575:Pesticides / Q000378:metabolism; D010782:Photolysis; D011722:Pyrethrins / Q000378:metabolism*
chemical_list: D000097:Acetonitriles; D009570:Nitriles; D010575:Pesticides; D011722:Pyrethrins; C017180:decamethrin; C099952:bifenthrin; D003300:Copper; D000432:Methanol; C032159:acetonitrile
keywords: Bifenthrin; Copper; Deltamethrin; Solvents