Figure 6: Calibration curve for Ethoprophos in tea
Figure 7: Calibration curve for Parathion in tea matrix
Japan
2
EU
3
EU
3
WHO
1
Avg Conc
LOD
LOQ
MRL MRL LOD MRL
Component
(ng/g)
Std. Dev.
% RSD
(ng/g)
(ng/g)
(ng/g) (ng/g) (ng/g)
(ng/g)
Dichlorvos
14
1.57
11.3
5
16
100
100
100
Molinate
9
0.75
8.7
2
7
20
Trifluralin
7
0.44
6.0
1
4
50
Ethoprophos
6
0.89
14.0
3
9
5
Di-allate
43
4.03
9.3
13
40
100
100
100
Phorate
9
0.59
6.6
2
6
100
100
100
Propyzamide (Pronamide)
11
1.04
9.6
3
10
50
50
50
Atrazine
6
0.46
7.6
1
5
100
100
100
Diazanon
13
0.60
4.7
2
6
100
50
50
Gamma BHC (Lindane)
18
0.94
5.3
3
9
50
50
50
Aldrin
7
1.70
25.2
5
17
ND 20
20
Metribuzin
36
6.04
16.9
19
60
100
Dursban (Chlorpyrifos)
19
2.80
14.7
9
28
10,000 100
100
2,000
Malathion
336
34.83
10.4
109
348
500
500
Sevin (Carbaryl)
27
4.48
16.9
14
45
1000
Parathion
46
7.82
17.2
25
78
300
100
100
trans
-Chlordane
8
1.21
14.8
4
12
20
Terbufos
43
4.38
10.3
14
44
5
cis
-Chlordane
7
0.72
9.7
2
7
20
Bifenthrin
32
6.09
19.0
19
61
25,000 5,000 100
cis
-Permethrin
78
7.71
9.9
24
77
20,000 100
100 20,000
trans-
Permethrin
78
9.41
9.4
30
94
20,000 100
100 20,000
Average
11.7
1. CODEX alimentarius (
)
2. Japanese Food Chemical Research Foundation (
)
3. Informal coordination of MRLs established in Directives 76/895/EEC, 86/362/EEC, 86/363/EEC, and 90/642/EEC (5058/VI/98)
Table 5: Comparison of LODs and LOQs to selected MRLs from international agencies and reporting bodies
Page 7 of 8
Compound
(R
2
)
Dichlorvos
0.9990
Molinate
0.9996
Trifluralin
0.9994
Ethoprophos
0.9997
Di-allate
0.9996
Phorate
0.9979
Propyzamide (Pronamide)
0.9985
Atrazine
0.9993
Diazanon
0.9917
Compound
(R
2
)
Gamma BHC (Lindane)
0.9949
Aldrin
0.9879
Metribuzin
0.9966
Dursban (Chlorpyrifos)
0.9998
Malathion
0.9998
Sevin (Carbaryl)
0.9997
Parathion
0.9993
trans
-Chlordane
0.9958
Terbufos
0.9993
Compound
(R
2
)
cis
-Chlordane
0.9944
Bifenthrin
1.0000
cis
-Permethrin
0.9993
trans
-Permethrin
0.9998
Average
0.9989
Table 4: Calibration curve results, demonstrating
excellent linearity with average R
2
of 0.9978
