OMB First to Final Action Recommendation Checklist 11-12-18

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

Green tea

No.

Retention time/min

Spike levels ( g/kg)

Calibration curve

Recovery/%

Pesticides

RSD/%

R 2

Slope

Intercept

No.1

No.2

No.3

No.4

No.5

AVE