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Determination results of multi-residues in tea by
LC-MS/MS
No.
Pesticides
Retention
time/min
Greentea
Calibration curve
Spike
levels
(μg/kg)
Recovery/%
RSD/
%
R2
Slope Intercept
No.1 No.2 No.3 No.4 No.5 AVE
IS chlorpyrifos-methyl
17.618
1 imidacloprid
5.663
0.9987
0.0850
0.0856
45
115.4
103.8
114.8
111.4
105.3
110.1
4.87
2 propoxur
8.264
0.9989
1.8593
31.8969
50
108.6
93.3
114.0
108.4
108.1
106.5
7.30
3 monolinuron
9.409
0.9980
0.0116
-0.0314
20
87.3
91.6
93.1
86.3
91.1
89.9
3.28
4 clomazone
11.107 0.9991
0.7681
0.9358
20
93.8
94.0
100.2
96.6
105.5
98.0
5.00
5 ethoprophos
13.899 0.9991
0.3678
1.0466
20
101.1
92.7
103.0
97.1
104.0
99.6
4.65
6 triadimefon
14.096 0.9985
0.2186
-1.0063
20
103.6
94.2
102.9
98.2
104.2
100.6
4.28
7 acetochlor
15.138 0.9990
0.2468
-0.3841
40
99.4
94.0
102.2
99.4
105.2
100.0
4.14
8 flutolanil
15.671 0.9969
0.4262
-0.8631
20
105.4
96.1
105.9
101.6
105.0
102.8
4.01
9 benalaxyl
16.24
0.9990
2.5914
18.3183
20
99.9
92.5
102.5
98.9
104.0
99.6
4.44
10 kresoxim-methyl
16.571 0.9946
0.1833
5.8772
200
107.1
96.0
92.0
103.6
103.7
100.5
6.21
11 picoxystrobin
17.119 0.9965
1.4234
1.7725
20
133.5
97.5
97.4
102.5
110.3
108.2
13.93
12 pirimiphos-methyl
16.453 0.9999
1.2458
5.7368
20
93.1
90.0
94.3
91.7
98.5
93.5
3.45
13 diazinon
17.09
0.9997
2.9582
-2.6557
20
105.9
95.5
97.4
97.1
108.8
101.0
5.93
14 bensulide
17.405 0.9952
0.2903
0.2172
60
116.7
93.3
99.7
103.2
106.0
103.8
8.30
15 quinoxyfen
17.491 0.9961
0.6027
4.4482
100
81.6
95.6
89.3
93.8
99.6
92.0
7.50
16 tebufenpyrad
18.016 0.9941
0.0441
-0.3803
20
114.5
99.8
97.9
105.3
106.4
104.8
6.22
17 indoxacarb
18.262 0.9992
0.0263
-0.0882
20
100.6
94.3
110.6
104.2
104.9
102.9
5.84
18 trifloxystrobin
18.311 0.9978
0.4936
-1.0594
20
101.7
98.6
101.7
100.2
108.9
102.2
3.85
19 chlorpyrifos
18.884 0.9928
0.0072
-0.0321
200
111.4
126.6
92.8
87.2
87.1
101.0
17.26
20 butralin
19.292 0.9956
0.0022
-0.0035
20
72.1
84.2
82.1
99.2
128.0
93.1
23.37
Lab-2:
Lab-13:
Recoveries for 41 pesticides in green tea and black tea determined by GC-MS: 70%-94%
Pesticides
Recovery
Pesticides
Recovery
Pesticides
Recovery
Phorate
84% Fenthion
82% Cypermethrin
88%
Quintozene
81% Malathion
82% Fenvalerate
90%
Diazinon
85% Fenitrothion
84% Deltamethrin
87%
Fonofos
80% Triadimefon
78% Trifluralin
84%
Etrimfos
79% Pendimethalin
81% Sulfotep
81%
Dimethoate
70% Quinalphos
88% Α-HCH
84%
Aldrin
81% Phenthoate
81% Δ-HCH
88%
Vinclozolin
79% Procymidone
92% Β-HCH
83%
Buprofezin
82% Dieldrin
80% Dicofol
85%
Metalaxyl
81% Methidathion
80% p,p'-DDD
79%
Methyl-parathion
85% Fenamiphos
80% o,p'-DDD
80%
Chlorpyrifos
90% Terbufos
81% o,p'-DDT
80%
Chlorpyrifosmethyl
93% Bifenthrin
94% p,p'-DDE
80%
Triazophos
84% Fenpropathrin
89%