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K

oshy

et al

.:

J

ournal of

AOAC I

nternational

V

ol

.

99, N

o

.

6, 2016 

1455

Table 8. Precision of retention time of standards

Compound

Concn, μg/mL

N

Retention time

Mean, min

RSD

r

, %

W-IV

1321

5

15.51

0.02

661

5

15.56

0.62

330

5

15.53

0.54

165

5

15.52

0.12

83

5

15.52

0.05

41.3

5

15.50

0.08

20.6

5

15.47

0.05

W-V

1201

5

19.70

0.04

600

5

19.73

0.55

300

5

19.72

0.46

150

5

19.70

0.07

75

5

19.72

0.40

37.5

5

19.66

0.03

18.8

5

19.65

0.06

WF-A

1475

5

20.35

0.04

738

5

20.39

0.49

369

5

20.38

0.41

184

5

20.36

0.06

92

5

20.36

0.06

46.1

5

20.34

0.03

23.1

5

20.32

0.05

12-D

1421

5

21.37

0.03

711

5

21.40

0.38

355

5

21.39

0.32

178

5

21.38

0.05

88.8

5

21.37

0.05

44.4

5

21.36

0.02

22.2

5

21.35

0.04

W-A

1382

5

22.22

0.02

691

5

22.26

0.34

346

5

22.25

0.29

173

5

22.24

0.05

86

5

22.24

0.05

43.2

5

22.22

0.02

21.6

5

22.22

0.04

W-B

1350

5

25.52

0.02

675

5

25.54

0.21

338

5

25.54

0.19

169

5

25.53

0.03

84

5

25.53

0.04

42.2

5

25.52

0.03

21.1

5

25.51

0.01

60