Effect of Pretreatment on Detection of 37 Pesticide Residues in Chrysanthemum indicum

Figure 5

Effect of extraction conditions on pesticide recoveries in groups A and B (a) pesticide recovery for different cleanup sorbents; (b) pesticide recovery for different extraction solvents; (c) pesticide recovery for different extraction times; and (d) pesticide recovery for different purification times.

(a)

(b)

(c)

(d)