| Rank | 
        Copeland method | 
        Multi-index comparison | 
       
      
        | Original data | 
        Pretreatment data | 
        Original data | 
        Pretreatment data | 
       
      
        | 1 | 
        2,4ʹ- DDT | 
        2,4ʹ- DDT | 
        2,4ʹ- DDT  | 
        2,4ʹ- DDT | 
       
      
        | 2 | 
        4,4ʹ- DDT | 
        4,4ʹ- DDT | 
        beta-Hexachlorocyclohexane  | 
        4,4ʹ- DDT | 
         
      
        | 3 | 
        4,4ʹ- DDE | 
        4,4ʹ- DDE | 
        4,4’- DDT  | 
        Hexachlorobenzene | 
       
      
        | 4 | 
        Chlorobiphenyl | 
        Chlorobiphenyl | 
        Hexachlorobenzene  | 
        Chlorobiphenyl | 
       
      
        | 5 | 
        Endrin | 
        Endrin | 
        Chlorobiphenyl  | 
        Endrin | 
       
      
        | 6 | 
        Benzo[a]pyrene | 
        Hexachlorobenzene | 
        4,4ʹ- DDE  | 
        beta-Hexachlorocyclohexane | 
       
      
        | 7 | 
        Hexachlorobenzene | 
        Benzo[a]pyrene | 
        Benzo[a]pyrene  | 
        Benzo[a]pyrene | 
       
      
        | 8 | 
        beta-Hexachlorocyclohexane | 
        Aldrin | 
        Heptachlor  | 
        Aldrin | 
       
      
        | 9 | 
        Aldrin | 
        beta-Hexachlorocyclohexane | 
        4,4ʹ- DDD  | 
        4,4ʹ- DDE | 
       
      
        | 10 | 
        4,4ʹ- DDD | 
        4,4ʹ- DDD | 
        Aldrin  | 
        Heptachlor | 
       
      
        | 11 | 
        Benzo[k]fluorathene | 
        Heptachlor | 
        naphthalene  | 
        4,4ʹ- DDD | 
       
      
        | 12 | 
        Heptachlor | 
        Benzo[k]fluorathene | 
        2,4ʹ- DDE  | 
        2,4ʹ- DDE | 
       
      
        | 13 | 
        2,4ʹ- DDE | 
        2,4ʹ- DDE | 
        Dicofol  | 
        Benzo[k]fluorathene | 
       
      
        | 14 | 
        Dicofol | 
        Dicofol | 
        Mirex  | 
        Indeno[1,2,3-cd]Pyrene | 
       
      
        | 15 | 
        Esfenvalerate | 
        Indeno[1,2,3-cd]Pyrene | 
        Endrin  | 
        2,4ʹ- DDD | 
       
      
        | 16 | 
        Indeno[1,2,3-cd]Pyrene | 
        Clorpyrifos | 
        Nitrfen  | 
        Clorpyrifos | 
       
      
        | 17 | 
        Clorpyrifos | 
        Esfenvalerate | 
        Benzo[k]fluorathene  | 
        Dicofol | 
       
      
        | 18 | 
        Mirex | 
        Mirex | 
        Indeno[1,2,3-cd]Pyrene  | 
        Mirex | 
       
      
        | 19 | 
        2,4ʹ- DDD | 
        2,4ʹ- DDD | 
        Trifluralin  | 
        Trifluralin | 
       
      
        | 20 | 
        Trifluralin | 
        Mocap | 
        Amitraz  | 
        Mocap | 
       
      |