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TABLE 4
Relative Rankings by Chemical Score
versus Composite Score
Notes on Table 4

CAS. No. CHEMICAL NAME A.
Ranking by Composite
Score		 B.
Ranking by Chemical
Score		 C.

(= B-A1)
83329 Acenaphthene 79 72 -7
208968 Acenaphthylene 39 137 98
107131 Acrylonitrile 139 128 -11
15972608 Alachlor 115 90 -25
309002 Aldrin 36 24 -12
120127 Anthracene 20 28 8
7440360 Antimony 115 110 -5
7440382 Arsenic 109 65 -44
1912249 Atrazine 115 65 -50
7440393 Barium 123 110 -13
56533 Benz (a) anthracene 1 14 13
50328 Benz(a)pyrene 92 90 -2
71432 Benzene 82 90 8
92875 Benzidine 79 65 -14
7440417 Beryllium 86 58 -28
128370 BHT 79 82 3
92524 Biphenyl 95 106 11
74975 Bromochloromethane 74 140 66
75274 Bromodichloromethane 39 82 43
75252 Bromoform 52 98 46
2008415 Butylate 8 37 29
85687 Butylbenzylphthalate 95 98 3
7440439 Cadmium 124 58 -66
1563662 Carbofuran 98 82 -16
75150 Carbon Disulfide 74 135 61
56235 Carbon Tetrachloride 98 98 0
57749 Chlordane 13 7 -6
108907 Chlorobenzene 27 53 26
67663 Chloroform 115 106 -9
106434 4-Chlorotoluene 74 124 50
2921882 Chlorpyrifos 61 37 -24
7440473 Chromium 109 58 -51
7440484 Cobalt 131 115 -16
7440508 Copper 115 72 -43
21725462 Cyanazine 56 82 26
57125 Cyanide 109 124 15
94757 2,4-D 104 65 -39
72548 p,p'-DDD 3 8 5
72559 p,p'-DDE 7 1 -6
50293 p,p'-DDT 13 1 -12
117817 DEHP 88 53 -35
1740198 Dehydroabietic acid 82 98 16
333415 Diazinon 72 37 -35
53703 Dibenzo(a,h)anthracene 2 13 11
124481 Dibromochloromethane 27 98 71
1918009 Dicamba 64 72 8
95501 1,2-Dichlorobenzene 74 65 -9
541731 1,3-Dichlorobenzene 46 37 -9
106467 1,4-Dichlorobenzene 124 115 -9
75343 1,1-Dichloroethane 104 137 33
107062 1,2-Dichloroethane 109 90 -19
75718 Dichlorofluoromethane 32 72 40
75092 Dichloromethane 124 106 -18
120365 Dichlorprop 52 106 54
78875 1,2-Dichloropropane 109 115 6
542756 1,3-Dichloropropene 131 128 -3
60571 Dieldrin 60 19 -41
84662 Diethylphthalate 141 128 -13
121697 N,N-Dimethylaniline 73 137 64
84742 Di-n-butylphthalate 88 72 -16
117840 Di-n-octyl phthalate 46 37 -9
115297 Endosulfan 64 37 -27
72208 Endrin 46 24 -22
759944 EPTC 44 58 14
563122 Ethion 3 9 6
100414 Ethylbenzene 98 133 35
206440 Fluoranthene 39 35 -4
86731 Fluorene 56 57 1
944229 Fonophos 15 46 31
110009 Furan 82 120 38
76448 Heptachlor 56 19 -37
1024573 Heptachlor epoxide 23 15 -8
118741 Hexachlorobenzene 8 1 -7
87683 Hexachloro-1,3-butadiene 23 24 1
77474 Hexachlorocyclopentadiene 124 115 -9
67721 Hexachloroethane 56 32 -24
110543 Hexane 23 56 33
193395 Indeno(1,2,3-cd)pyrene 20 128 108
78591 Isophorone 142 140 -2
143500 Kepone 18 19 1
7439921 Lead 136 58 -78
58899 Lindane 64 19 -45
330552 Linuron 27 32 5
121755 Malathion 88 82 -6
7439965 Manganese 109 90 -19
94746 MCPA 46 65 19
7085190 Mecoprop 15 32 17
7439976 Mercury 27 9 -18
72435 p,p'-Methoxychlor 44 28 -16
90120 1-Methylnaphthalene 27 47 20
91576 2-Methylnaphthalene 17 51 34
51218452 Metolachlor 104 110 6
21087649 Metribuzin 52 82 30
2385855 Mirex 8 1 -7
7439987 Molybdenum 98 72 -26
91203 Naphthalene 131 120 -11
7440020 Nickel 115 72 -43
86306 N-Nitrosodiphenylamine 92 120 28
Class 07-8 PBBs 36 15 -21
1336363 PCBs 12 1 -11
40487421 Pendimethalin 3 24 21
1825214 Pentachloroanisole 88 58 -30
608935 Pentachlorobenzene 23 18 -5
87865 Pentachlorophenol 82 47 -35
85018 Phenanthrene 61 37 -24
108952 Phenol 98 72 -26
298022 Phorate 52 90 38
39801144 Photomirex 6 12 6
1610180 Prometon 32 82 50
129000 Pyrene 64 53 -11
110861 Pyridine 64 133 69
7782492 Selenium 98 58 -40
7440224 Silver 104 98 -6
93721 Silvex 92 90 -2
122349 Simazine 86 47 -39
7440246 Strontium 131 128 -3
100425 Styrene 64 98 34
1746016 2,3,7,8-TCDD 38 9 -29
13071799 Terbufos 124 110 -14
634662 1,2,3,4-Tetrachlorobenzene 32 19 -13
634902 1,2,3,5-Tetrachlorobenzene 32 31 -1
95943 1,2,4,5-Tetrachlorobenzene 18 15 -3
79345 1,1,2,2-Tetrachloroethane 140 124 -16
127184 Tetrachloroethylene 124 110 -14
116290 Tetradifon 20 72 52
109999 Tetrahydrofuran 104 140 36
7440315 Tin 124 120 -4
7440326 Titanium 136 115 -21
108883 Toluene 64 36 -28
8001352 Toxaphene 8 1 -7
87616 1,2,3-Trichlorobenzene 46 37 -9
120821 1,2,4-Trichlorobenzene 64 37 -27
108703 1,3,5-Trichlorobenzene 61 51 -10
71556 1,1,1-Trichloroethane 136 124 -12
79005 1,1,2-Trichloroethane 46 72 26
79016 Trichloroethylene 74 65 -9
95954 2,4,5-Trichlorophenol 39 37 -2
88062 2,4,6-Trichlorophenol 115 82 -33
93765 2,4,5-Trichlorophenoxyacetic acid 95 90 -5
1582098 Trifluralin 39 28 -11
7440622 Vanadium 115 98 -17
1330207 Xylene (o,m,p included) 131 135 4
1Represents the change in ranking based on the uncertainty score.

Notes on Table 4
Full published article now available (April 2002)

The composite and chemical score rankings were determined by sorting the chemicals in descending order and then assigning the appropriate relative rank. Since some chemicals had the same composite or chemical score, the same relative ranking was assigned to the same scores. For example, in Table 3 the calculated composite score for p,p'-DDD, ethion, and pendimethalin were 67. In Table 4, the composite score rankings for these chemicals were all assigned a 3. Benz (a) anthracene and dibenzo (a,h) anthracene were assigned composite score rankings of 1 and 2, respectively. Further, photomirex was assigned a composite score ranking of 6, since p,p'-DDD, ethion, and pendimethalin were assigned composite score rankings of 3 (because of similar calculated composite scores) and photomirex is the sixth chemical in the list. Therefore, Table 4 provides only the composite and chemical score rankings and not the calculated scores, which are presented in Table 3.

Reference:
RR Mitchell, CL Summer, SA Blonde, DM Bush, GK Hurlburt, EM Snyder, and JP Giesy. SCRAM: A scoring and ranking system for persistent, bioaccumulative, and toxic substances for the North American Great Lakes -- resulting chemical scores and rankings. Human Ecol Risk Assess. 8(3):537-557. April 2002.

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Jonathan Barney, Water Division, Region 5, USEPA
barney.jonathan@epa.gov

Last Updated: 17 April 2002

URL: http://www.epa.gov/toxteam/pbtrept/pbttable4.htm