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19
<br />96-h LC50
<br />Test Stage or Temp 95% CI
<br />organism wt (g) (C) (µg/L)
<br />Green sunfish 0.8 18 280
<br />186.422
<br />Bluegill 1.1 18 13
<br />10.16
<br />CHLORDANE
<br />Chemical Name:1,2,4,5,6,7,8,8-Octachloro-
<br />2, 3, 3a, 4, 7, 7a-hexahydro-4, 7-methanoindene
<br />Alternate Names: Aspon, Belt, CAS 57-75-9, Chlor=
<br />dan, Chlor-Kill, Corodane, ENT-9932, Krypclor,
<br />Octachlor, Ortho-Klor, Synklor, Topiclor 20,
<br />Velsico11068
<br />Principal Use: Insecticide
<br />Sample Description: Technical material, 100% (con-
<br />tains 60% chlordane isomers and 40% related com-
<br />pounds)
<br />SUMMARY OF ACUTE TOXICITY
<br />96-h LC50
<br />Test Stage or Temp 95% Cl
<br />organism wt (g) (C) (µg/L)
<br />Simoceph¢lus 11 15 208
<br />12-32
<br />96-h LC50
<br />Test Stage or Temp 95% CI
<br />organism wt (g) (C) (µg/L)
<br />Channel catfish 1.9 17 6.7
<br />3.1-14.5
<br />Bluegill 1.4 17 57
<br />40-81
<br />Largemouth bass 0.1 17 3.0
<br />2.2-4.2
<br />848-h EC50.
<br />NOTE: In flow-through tests, crayfish (Orconectes)
<br />were the least sensitive invertebrate; the 96-h LC50
<br />was 50 µg/L and the 35-day LC50 was 31.6 µg/L. Diet
<br />quality was found to significantly alter toxicity for
<br />rainbow trout; 96-h LC50's ranged from 8.2 to 47 µg/L
<br />in fish fed different commercial and synthetic diets.
<br />Bluegills were slightly more sensitive at 13 °C than at
<br />24°C; 96-h LC50's were 83 and 93 µg/L, respectively.
<br />Toxicity of cis-chlordane to bluegills was about 8 times
<br />that of trans-chlordane; 96-h LC50 values were 7.1 and
<br />50.5 µg/L, respectively. Residues of cis-chlordane were
<br />preferentially stored and magnified over trans-chlor-
<br />dane by bluegills and invertebrates in ponds treated
<br />with technical chlordane at concentrations ranging
<br />from 0.37 to 1.14 µg/L. The cis isomer, with a residue
<br />half-life estimated to be 46 days, persisted longer after
<br />treatment than did the trans isomer. The trans isomer
<br />was not detectable after 56 days. Invertebrate popu-
<br />lations were significantly depressed in treated ponds-
<br />mayflies the most and midges the least.
<br />Daphnia pulex I1 15 248 CHLORDANE HCS-3260
<br /> 20-28
<br />G. fasciatus M 21 40 Chemical Name: 1,2,4,5,6,7,8,8-Octachloro-
<br /> 21-60 2,3,3a,4,7,7a-hexahydro-4,7-methanoindene
<br />Pteronarcys YC2 15 15 Alternate Names: Experimental chlordane, HCS-3260
<br /> 9-24
<br /> Principal Use: Insecticide
<br />Coho salmon 0.6 12 14
<br /> 11-17
<br />Sample Description: Technical material, 100%'8; emul-
<br />Cutthroat trout 1.0 12 27 sifiable concentrate, 45%2; granular, 33.3%3
<br /> 24.31 SUMMARY OF ACUTE TOXICITY
<br />Rainbow trout 1.0 12 42 96-h LC50
<br /> 37-48
<br />Test Wt Temp 95% CI
<br />Brown trout 0.6 12 11.1 organism (g) (C) (µg/L)
<br /> 9.3.13.1 Rainbow trout' 1.5 12 24.9
<br /> 16.1-38.5
<br />Fathead minnow 0.7 17 115
<br /> 62-214 Fathead minnow' 0.7 17 24.8
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