| 
   
  | 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 |  |