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<br />CHEMICALS IN FISH TISSUE
<br />AND BED SEDIMENT
<br />
<br />Concentrations and detection frequencies, Upper Colorado River
<br />Basin, 1996-98-Detection sensitivity varies among chemicals and,
<br />thus, frequencies are not directly comparable among chemicals.
<br />Study-unit frequencies of detection are based on small sample sizes;
<br />the applicable sample size is specified in each graph
<br />
<br />. Detected concentration in Study Unit
<br />
<br />66 38 Frequencies of detection, in percent. Detection frequencies
<br />were not censored at any common reporting limit. The left-
<br />hand column is the study-unit frequency and the right-hand
<br />column is the national frequency
<br />
<br />Not measured or sample size less than two
<br />
<br />12 Study-unit sample size
<br />
<br />National ranges of concentrations detected, by land use, in 36
<br />NAWQA Study Units, 1991-98-Ranges include only samples
<br />in which a chemical was detected
<br />
<br />Fish tissue from streams in agricultural areas
<br />Fish tissue from streams in urban areas
<br />Fish tissue from streams draining mixed land uses
<br />
<br />Sediment from streams in agricultural areas
<br />Sediment from streams in urban areas
<br />Sediment from streams draining mixed land uses
<br />
<br />Lowest
<br />25
<br />percent
<br />
<br />Middle
<br />5{)
<br />percent
<br />
<br />Highest
<br />25
<br />percent
<br />
<br />National benchmarks for fish tissue and bed sediment
<br />National benchmarks include standards and guidelines related to
<br />criteria for protection of the health of fish-eating wildlife and aquatic
<br />organisms. Sources include the U.S. Environmental Protection Agency,
<br />other Federal and State agencies, and the Canadian Council of
<br />Ministers of the Environment
<br />
<br />Protection of fish-eating wildlife (applies to fish tissue)
<br />Protection of aquatic life (applies to bed sediment)
<br />No benchmark for protection of fish-eating wildlife
<br />No benchmark for protection of aquatic life
<br />
<br />Organochlorines in fish tissue (whole body)
<br />and bed sediment
<br />
<br />Study-unit frequency of detection, in percent
<br />1 National frequency of detection, in percent
<br />
<br />1 ~otal Chlo:dane (Su~ of 5 chlor~anes)
<br />80 38 = I
<br />2~ ~~ IIIIUi I-
<br />
<br />8ir ~
<br />
<br />Study-unit sample ,Sil
<br />
<br />o,p'+p,p'-DDD (sum of o,p'-DDD and p,p'-DDD) .
<br />
<br />40 49
<br />o 69
<br />12 50
<br />33 27
<br />o 50
<br />o 20
<br />
<br />IIIIIIIlWI
<br />
<br />~..
<br />
<br />0.1
<br />
<br />10 100 1,000 10,000
<br />
<br />CONCENTRATION, IN MICROGRAMS PER KILOGRAM
<br />(Fish tissue is wet weight; bed sediment is dry weight)
<br />
<br />100,000
<br />
<br />Study-unit frequency of detection, in percent
<br />1 National frequency of detection, in percent
<br />11 I t
<br />p,p'-DDE . ..
<br />100 90 I .
<br />100 94
<br />75 92
<br />
<br />83 48 ----c:::::.:..:::::t--
<br />o 62
<br />33 39 ..
<br />
<br />Study-unit sample :il
<br />
<br />5
<br />2
<br />8
<br />6
<br />2
<br />6
<br />
<br />
<br />100
<br />100
<br />75
<br />
<br />83
<br />o
<br />33
<br />
<br />90
<br />94
<br />92
<br />
<br />48
<br />62
<br />39
<br />
<br />
<br />5
<br />2
<br />8
<br />6
<br />2
<br />6
<br />
<br />~.=1~._.-
<br />
<br />100
<br />100
<br />75
<br />
<br />83
<br />o
<br />33
<br />
<br />90
<br />94
<br />93
<br />49
<br />66
<br />41
<br />
<br />Total DDT (sum of 6 DDTs) ..
<br />
<br />",~
<br />
<br />-~'::.=.~-.-
<br />
<br />5
<br />2
<br />8
<br />6
<br />2
<br />6
<br />
<br />.
<br />
<br />60
<br />o
<br />25
<br />50
<br />o
<br />o
<br />
<br />o,p'+p,p'-DDT (sum of o,p'-DDT and p,p'-DDT) .
<br />--
<br />
<br />5
<br />2
<br />8
<br />6
<br />2
<br />6
<br />
<br />31
<br />53
<br />29
<br />19
<br />38
<br />11
<br />
<br />.....p'
<br />oT.--
<br />
<br />100
<br />o
<br />38
<br />33
<br />o
<br />o
<br />
<br />Dieldrin (Panoram D-31, Octalox) .
<br />IJLJI.
<br />.......1.'.
<br />..=+-p-
<br />
<br />
<br />Dieldrin+aldrin (sum of dieldrin and aldrin)
<br />
<br />~'l:-
<br />
<br />5
<br />2
<br />8
<br />6
<br />2
<br />6
<br />
<br />53
<br />42
<br />38
<br />13
<br />30
<br />9
<br />
<br />5
<br />2
<br />8
<br />6
<br />2
<br />6
<br />
<br />100
<br />o
<br />38
<br />
<br />33
<br />o
<br />o
<br />
<br />52
<br />42
<br />38
<br />13
<br />29
<br />9
<br />
<br />-.:+-
<br />
<br />0,1
<br />
<br />10
<br />
<br />100
<br />
<br />1,000
<br />
<br />10,000
<br />
<br />100,000
<br />
<br />CONCENTRATION, IN MICROGRAMS PER KILOGRAM
<br />(Fish tissue is wet weight; bed sediment is dry weight)
<br />
<br />5
<br />2
<br />8
<br />6
<br />2
<br />6
<br />
<br />Other organochlorines detected
<br />DCPA (Dacthal, chlorthal-dimethyl) . ..
<br />Heptachlor epoxide (Heptachlor breakdown product) .
<br />Heptachlor+heptachlor epoxide (sum of heptachlor and heptachlor epoxide)
<br />Hexachlorobenzene (HCB) ..
<br />Toxaphene (Camphechlor, Hercules 3956) . ..
<br />
<br />Organochlorines not detected
<br />Chloroneb (Chloronebe, Demosan) . ..
<br />Endosuifan I (alpha-Endosulfan, Thiodan) . ..
<br />Endrin (Endrine)
<br />gamma-HCH (Lindane, gamma-BHC, Gammexane) .
<br />Total-HCH (sum of alpha-HCH, beta-HCH, gamma-HCH, and delta-HCH)
<br />Isodrin (Isodrine, Compound 711) . ..
<br />p,p'-Methoxychlor (Marlate, methoxychlore) . ..
<br />o,p'-Methoxychlor' ..
<br />Mirex (Dechlorane) ..
<br />Total PCB
<br />Pentachloroanisole (PCA) . ..
<br />cis-Permethrin (Ambush, Astro, Pounce) . ..
<br />trans-Permethrin (Ambush, Astro, Pounce) . ..
<br />
<br />5
<br />2
<br />8
<br />6
<br />2
<br />6
<br />
<br />Water-Quality Data in a National Context 31
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