Degradation of chlorpyrifos and carbaryl soil: Influence of temperature and soil moisture | ||
| Journal of Pest Control and Environmental Sciences | ||
| Volume 8, Issue 3, December 2000, Pages 1-14 PDF (352.66 K) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/jpces.2000.460568 | ||
| Author | ||
| Hesham F. H. Hafez* | ||
| Plant Dept., Fac., of Agric., Minia Univ., Minia, Egypt. | ||
| Abstract | ||
| The degradation of chlorpyrifos and carbaryl in clay loam soil (5µg/g) was evaluated under laboratory conditions to determine the effect of temperature and soil on their degradation rates. They were both affected by temperature and soil moisture. Half-lives (t ) were calculated by assuming that degradation of both insecticides follows first order kinetics. The t values of chlorpyrifos decreased from 148-76 days at 15ºC and from 60 to 32.5 days at 25ºC with soil moisture increase from 15 to 30%; the t of carbaryl, in the same conditions, decreased from 100 to 44.6 days at 15ºC and from 52.5 to 28.8 days at 25ºC. At 35 ºC, the effects of an increase in soil moisture from 15 to 30% were larger on the degradation of either insecticide, as t decreased from 56.1 to 21.9 days of chlorpyrifos and from 38.1 to 11.5 days of carbaryl. The analysis of residues showed that there were at least 4 degradation products of carbaryl and 2 only of chlorpyrifos were detected by HPLC. | ||
| Keywords | ||
| Insecticides; chlorpyrifos; carbaryl; soil; degradation | ||
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