Scientific Investigations Report 2007–5144
U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2007–5144
Table 5. Concentrations of BTEX, oxygenate, and degradation products in field blank water samples, Lakes Mead and Mohave, Nevada, 2004–06.
[Concentrations are expressed in micrograms per liter, unless indicated otherwise. Abbreviations: <, less than; E, estimated concentration; M, result deleted due to highly variable analytical results]
| Compound | Sample type: | Field blank | |||||
|---|---|---|---|---|---|---|---|
| Date: | 06-23-2004 | 03-23-2006 | 05-31-2006 | 07-07-2006 | 08-21-2006 | 09-05-2006 | |
| Time: | 1030 | 0715 | 1305 | 0805 | 1115 | 0700 | |
| Benzene | <0.01 | <0.01 | <0.01 | <0.01 | <0.01 | <0.01 | |
| Ethylbenzene | <0.03 | <0.03 | <0.03 | <0.03 | <0.03 | <0.03 | |
| m-, p-Xylene | <0.07 | <0.07 | <0.07 | <0.07 | <0.07 | <0.07 | |
| o-Xylene | <0.04 | <0.04 | <0.04 | <0.04 | <0.04 | <0.04 | |
| Toluene | <0.01 | <0.01 | <0.01 | E0.01 | <0.01 | <0.01 | |
| Diisopropyl ether | <0.08 | <0.04 | <0.06 | <0.06 | <0.06 | <0.06 | |
| Ethyl tert-butyl ether | <0.1 | <0.04 | <0.1 | <0.1 | <0.1 | <0.1 | |
| Methyl tert-butyl ether | <0.08 | <0.04 | <0.05 | <0.05 | <0.05 | <0.05 | |
| Methyl tert-pentyl ether | <0.07 | <0.03 | <0.05 | <0.05 | <0.05 | <0.05 | |
| Methyl acetate | <0.4 | <1 | <1 | <1 | <1 | <1 | |
| tert-amyl alcohol | <0.4 | <1 | <1 | <1 | <1 | <1 | |
| tert-butyl alcohol | <1 | <2 | <2 | <2 | <2 | <2 | |
| Acetone | <1 | <1 | M | <1 | <1 | <1 | |
| Isobutyl alcohol-d6 surrogate percent recovery1 | 95.5 | 88.1 | 129 | 109 | 104 | 96 | |
| 1,2-Dichloroethane-d4 surrogate percent recovery1 | 98.6 | 101 | 109 | 112 | 113 | 104 | |
| 1-Bromo-4-fluoro benzene surrogate percent recovery1 | 97.9 | 96.7 | 81.4 | 83.8 | 98.5 | 99.1 | |
| Toluene-d8 surrogate percent recovery1 | 99.3 | 100 | 100 | 105 | 115 | 99.4 | |
1 Values represent amount of surrogate compound recovered from sample by analytical procedure. These compounds are added to the samples and are not present in the environment.
U.S. Department of the Interior | U.S. Geological Survey
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