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Scientific Investigations Report 2007–5144

U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2007–5144

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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.

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