Open-File Report 01-282
Sediment-Deposition Rates and Organic Compounds in Bottom Sediment at Four Sites in Lake Mead, Nevada, May 1998
Table of Contents | Conversion Factors and Chemical Abbreviations | Report Home PageTable 9. Furan concentrations in bottom-sediment cores at three sites in Lake Mead, May 1998
[Abbreviations: TCDF, tetrachlorodibenzofuran; PeCDF, pentachlorodibenzofuran; HxCDF, hexachlorodibenzofuran; HpCDF, heptachlorodibenzofuran; OCDF, octachlorodibenzofuran. Symbols: <, less than; *, estimated (reported when the compound has passed all criteria used to identify its presence and only the concentration is estimated). All concentrations are in picograms per gram]
|
Depth interval (centimeters) |
Total TCDF |
2,3,7,8 TCDF |
Total PeCDF |
1,2,3,7,8 PeCDF |
2,3,4,7,8 PeCDF |
Total HxCDF |
1,2,3,4,7,8 HxCDF |
|
Site 1: Las Vegas Bay -- shallow |
|||||||
|
5-10 |
85 |
4.5 |
54 |
*10 |
<4.7 |
46 |
15 |
| 15-20 | 86 | 5.3 | 36 | *8.2 | <4.1 | 19 | *10 |
| 25-30 | 110 | 6.1 | 44 | *9.5 | <4.5 | 33 | *11 |
| 35-40 | 150 | 9.0 | 100 | 15 | *7.5 | 72 | 20 |
| 55-60 | 92 | 5.4 | 28 | *7.9 | <3.6 | 20 | *8.4 |
| 75-80 | 32 | 2.1 | 7.4 | <3.3 | <1.2 | 8.2 | *4.1 |
| 95-100 | 48 | 2.8 | 49 | *8.0 | <3.4 | 48 | 13 |
|
Site 2: Las Vegas Bay -- deep |
|||||||
|
5-10 |
97 |
6.8 |
64 |
*12 |
<5.8 |
50 |
17 |
| 15-20 | 320 | 20 | 220 | 27 | 13 | 180 | 41 |
| 25-30 | 260 | 16 | 220 | 25 | 13 | 190 | 42 |
| 35-40 | 85 | 5.4 | 62 | 9.5 | *4.5 | 28 | 12 |
| 55-60 | 41 | 3.0 | 9.7 | <3.7 | <2.2 | <4.3 | <4.5 |
| 75-80 | 36 | *2.1 | 17 | <3.4 | <1.7 | <4.4 | <4.4 |
| 95-100 | 19 | *1.3 | <5.2 | <1.8 | <1.2 | <1.8 | <1.8 |
|
Site 4: Colorado and Virgin Rivers confluence (pre-impoundment) |
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|
3-6 |
<.76 |
<.76 |
<1.6 |
<1.6 |
<1.6 |
<.66 |
<.59 |
| 9-12 | <.72 | <.72 | <1.1 | <1.1 | <1.1 | <.65 | <.56 |
| 15-18 | <.89 | <.33 | <1.5 | <1.5 | <1.5 | <.73 | <.58 |
| 21-24 | <.74 | <.74 | <2.1 | <2.1 | <2.1 | <.96 | <.85 |
| 45-50 | <.55 | <.55 | <.60 | <.60 | <.60 | <.69 | <.60 |
| 65-70 | <.64 | <.64 | <1.5 | <1.4 | <1.5 | <.67 | <.58 |
|
Depth interval (centimeters) |
1,2,3,6,7,8 HxCDF |
2,3,4,6,7,8 HxCDF |
1,2,3,7,8,9 HxCDF |
Total HpCDF |
1,2,3,4,6,7,8 HpCDF |
1,2,3,4,7,8,9 HpCDF |
OCDF |
|
Site 1: Las Vegas Bay -- shallow |
|||||||
|
5-10 |
*9.2 |
<2.2 |
<2.2 |
60 |
29 |
*11 |
100 |
| 15-20 | <5.9 | <1.7 | <1.6 | 30 | 16 | *6.7 | 58 |
| 25-30 | *6.9 | <1.5 | <1.6 | 35 | 19 | *8.2 | 66 |
| 35-40 | 12 | <3.3 | <2.3 | 66 | 31 | 15 | 110 |
| 55-60 | <4.4 | <1.5 | <1.2 | 20 | 13 | *6.9 | 44 |
| 75-80 | <2.5 | <.87 | <1.6 | 8.0 | *8.0 | <2.8 | 23 |
| 95-100 | *8.8 | <2.2 | <2.1 | 65 | 32 | 11 | 90 |
|
Site 2: Las Vegas Bay -- deep |
|||||||
|
5-10 |
*9.6 |
<2.0 |
<2.1 |
60 |
28 |
*13 |
100 |
| 15-20 | 24 | *5.9 | *4.5 | 150 | 72 | 31 | 260 |
| 25-30 | 24 | *6.4 | *4.4 | 150 | 69 | 32 | 280 |
| 35-40 | *6.4 | <1.4 | <1.4 | 39 | 19 | 7.8 | 67 |
| 55-60 | <2.9 | <.73 | <.63 | 7.6 | *7.6 | <2.5 | 23 |
| 75-80 | <2.7 | <1.1 | <.80 | 13 | *7.8 | <2.8 | 26 |
| 95-100 | <1.3 | <.38 | <.30 | <3.8 | <3.8 | <1.6 | *11 |
|
Site 4: Colorado and Virgin Rivers confluence (pre-impoundment) |
|||||||
|
3-6 |
<.64 |
<.57 |
<.66 |
<1.8 |
<1.6 |
<1.8 |
<4.8 |
| 9-12 | <.63 | <.58 | <.65 | <.85 | <.85 | <.43 | <.74 |
| 15-18 | <.63 | <.61 | <.73 | <.65 | <.47 | <.65 | <.89 |
| 21-24 | <.90 | <.79 | <.96 | <.68 | <.68 | <.68 | <2.4 |
| 45-50 | <.66 | <.58 | <.69 | <.52 | <.38 | <.52 | <1.5 |
| 65-70 | <.64 | <.55 | <.67 | <.70 | <.46 | <.70 | <1.3 |