کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1269705 | 972460 | 2010 | 6 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Degradation behavior and products of malathion and chlorpyrifos spiked in apple juice by ultrasonic treatment Degradation behavior and products of malathion and chlorpyrifos spiked in apple juice by ultrasonic treatment](/preview/png/1269705.png)
Apple juice (13 °Brix) spiked with malathion and chlorpyrifos (2–3 mg l−1 of each compound) was treated under different ultrasonic irradiations. Results showed that ultrasonic treatment was effective for the degradation of malathion and chlorpyrifos in apple juice, and the output power and treatment time significantly influenced the degradation of both pesticides (p < 0.05). The maximum degradations were achieved for malathion (41.7%) and chlorpyrifos (82.0%) after the ultrasonic treatment at 500 W for 120 min. The degradation kinetics of both pesticides were fitted to the first-order kinetics model well (R2 ⩾ 0.90). The kinetics parameters indicated that chlorpyrifos was much more labile to ultrasonic treatment than malathion. Furthermore, malaoxon and chlorpyrifos oxon were identified as the degradation products of malathion and chlorpyrifos by gas chromatography–mass spectrometry (GC–MS), respectively. The oxidation pathway through the hydroxyl radical attack on the PS bond of pesticide molecules was proposed.
Journal: Ultrasonics Sonochemistry - Volume 17, Issue 1, January 2010, Pages 72–77