Chlorpyrifos remain in leaves of the apple trees and the white clover

To guarantee the feeding security of livestock and poultry, the amount of chlorpyrifos remain in leaves of apple trees and white clover collected from the garden of Northwest AF University was measured by gas chromatography (GC). This study showed that the halflife periods of chlorpyrifos in leaves of apple trees and the clover were 1.8 d and 2.2 d respectively when the normal concentration of chlorpyrifos was sprayed, and they were 1.8 d and 3.4 d when the double concentration of chlorpyrifos was sprayed. The adjustable scope of chlorpyrifos concentration of leaves in CK treatment was 0.5 mg/kg, however, the chlorpyrifos concentration in leaves sprayed by chlorpyrifos showed a fast degradation in the earlier stage and then showed a slow degradation in the later stage. The remains in the apple leaves was lower than that in the white clover when the tow kind leaves were sprayed by chlorpyrifos, indicating that the chlorpyrifos concentration in leaves of apple trees sprayed by the normal concentration was lower than that in the white clover sprayed by double normal concentration. On the 21std, the chlorpyrifos remain was higher than remain standard presented by Chinese government and EU when chlorpyrifos was sprayed, at this time, the leaves of apple trees and white clover was dangerous to livestock and poultry due to high chlorpyrifos remain.