Rapid Simultaneous Determination of 43 Pesticide Residues in Schizonepeta tenuifolia by Gas Chromatography Mass Spectrometry

Table 2

Design and results of orthogonal test.

Trial no.	Factor			Average recovery (%)
	A^a	B^b	C^c
1	1	1	1	79.6
2	1	2	2	84.6
3	1	3	3	83.2
4	2	1	2	78.4
5	2	2	3	78.3
6	2	3	1	70.6
7	3	1	3	69.4
8	3	2	1	67.3
9	3	3	2	70.5
K1	82.5	75.8	72.5
K2	75.8	76.8	77.8
K3	69.1	74.8	77.0
Range	13.4	2.0	5.3

K_i, mean effect of each factor at level i (i = 1, 2, 3). ^a Factor A, extraction solvent; level 1, acetonitrile; level 2, petroleum ether; level 3, acetone. ^b Factor B, volume; level 1, 10 mL; level 2, 16 mL; level 3, 20 mL. ^c Factor C, extraction time; level 1, 15 min; level 2, 20 min; level 3, 25 min.