No Compound Retention times 1 µg L-1 2 µg L-1
1 α-BHC 13.78 96.19 ± 0.9 97.39 ± 97.39
2 β-BHC 14.18 106.05 ± 2.3 109.22 ± 2.9
3 γ-BHC 14.34 98.21 ± 1.7 102.89 ± 2.4
4 δ-BHC 14.78 97.32 ± 3.5 98.08 ± 1.8
5 Heptachlor 15.74 90.56 ± 4.3 89.36 ± 3.4
6 Aldrin 16.57 98.14 ± 2.8 96.79 ± 1.9
7 Heptachlor epoxide 17.33 89.87 ± 3.9 91.81 ± 2.7
8 γ-Chlordane 17.60 95.36 ± 1.2 96.02 ± 3.1
9 α-Chlordane 18.30 92.78 ± 2.5 88.50 ± 2.6
10 Endosulfan I 18.77 93.52 ± 2.8 95.10 ± 4.1
11 4,4'-DDE 19.43 91.35 ± 4.6 90.25 ± 3.8
12 Dieldrin 19.57 96.89 ± 1.8 98.39 ± 2.9
13 Endrin 20.35 101.08 ± 2.2 97.04 ± 1.7
14 Endosulfan II 20.72 103.78 ± 0.8 107.90 ±3.2
15 4,4'-DDD 21.02 94.81 ± 2.4 95.70 ± 2.8
16 Endrin aldehyde 21.45 98.18 ± 0.6 99.53 ± 0.7
17 Endrin ketone 22.53 103.72 ± 1.9 105.95 ± 2.3
18 4,4'-DDT 22.64 87.51 ± 3.7 90.15 ± 4.1
19 Endosulfan sulfate 24.91 97.98 ± 1.2 96.75 ± 3.3
20 Methoxychlor 25.81 96.89 ± 1.5 95.02 ± 3.9
Table 2: Percent recovery of selected pesticides at two concentration levels by using SPME-GC-ECD technique.