Tariq Saadia Rashid, Ahmed Dildar, Farooq Amna, Rasheed Sonia, Mansoor Mubarkah
Department of Chemistry, Lahore College for Women University, Lahore, Pakistan.
Department of Chemistry, Forman Christian College, A chartered University, Lahore, Pakistan.
Environ Monit Assess. 2017 Feb;189(2):71. doi: 10.1007/s10661-017-5789-6. Epub 2017 Jan 23.
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 to 3.5 × 10 h in acetonitrile and 2.5 × 10 to 3.4 × 10 h in methanol after the addition of copper. Similarly, the rate of photodegradation of bifenthrin was increased from 5.0 × 10 to 9.0 × 10 h in acetonitrile and 7.0 × 10to 9.05 × 10 h in methanol with the addition of copper. Thus, copper has the potential to enhance the photodegradation of bifenthrin and deltamethrin in both the solvents.
在铜盐以及两种不同溶剂（甲醇和乙腈）存在的情况下，研究了联苯菊酯和溴氰菊酯的光降解情况。研究结果表明，在没有任何金属盐的情况下，这两种农药在乙腈中的降解速度比在甲醇中更快。经过24小时的紫外线照射后，溴氰菊酯在乙腈中有70%发生了降解，而在这种溶剂中联苯菊酯只有41%发生了降解。在甲醇中，联苯菊酯的降解速度比在乙腈中大大加快，而溴氰菊酯的降解速度与在乙腈中的相当。向联苯菊酯和溴氰菊酯的乙腈溶液中添加铜后，光降解作用进一步增强。添加铜后，溴氰菊酯在乙腈中的光降解速率从2.4×10变为3.5×10 h，在甲醇中从2.5×10变为3.4×10 h。同样，添加铜后，联苯菊酯在乙腈中的光降解速率从5.0×10变为9.0×10 h，在甲醇中从7.0×10变为9.05×10 h。因此，铜有增强这两种溶剂中联苯菊酯和溴氰菊酯光降解的潜力。
