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
Table 4: Top 20 Hazardous Chemicals.