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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/%
R
2
Slope
Intercept
No.1
No.2
No.3
No.4
No.5
AVE