AOAC-RI ERP Book - FAOM METHOD.pdf

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Recoveries for 41 pesticides in green tea and black tea determined by GC-MS: 70%-94%
No. Pesticides Recovery
1. Phorate 84%
2. Quintozene 81%
3. Diazinon 85%
4. Fonofos 80%
5. Etrimfos 79%
6. Dimethoate 70%
7. Aldrin 81%
8. Vinclozolin 79%
9. Buprofezin 82%
10. Metalaxyl 81%
11. Methyl-parathion 85%
12. Chlorpyrifos 90%
13. Chlorpyrifosmethyl 93%
14. Triazophos 84%
15. Fenthion 82%
16. Malathion 82%
17. Fenitrothion 84%
18. Triadimefon 78%
19. Pendimethalin 81%
20. Quinalphos 88%
21. Phenthoate 81%
No. Pesticides Recovery
22. Procymidone 92%
23. Dieldrin 80%
24. Methidathion 80%
25. Fenamiphos 80%
26. Terbufos 81%
27. Bifenthrin 94%
28. Fenpropathrin 89%
29. Cypermethrin 88%
30. Fenvalerate 90%
31. Deltamethrin 87%
32. Trifluralin 84%
33. Sulfotep 81%
34. -HCH 84%
35. -HCH 88%
36. -HCH 83%
37. Dicofol 85%
38. p,p'-DDD 79%
39. o,p'-DDD 80%
40. o,p'-DDT 80%
41. p,p'-DDE 80%
Appendix
Determination results of multi-residues in tea by GC-MS
No.
Pesticides
Retention
time/min
Green tea
Calibration curve Spike
levels
( g/kg)
Recovery/%
RSD/%
R2 Slope Intercept No.1 No.2 No.3 No.4 No.5 AVE