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Scientific Investigations Report 2007–5144

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

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Table 6. Quality-assurance data associated with collection and analysis of SPMDs (semipermeable membrane devices) for PAHs (polycyclic aromatic hydrocarbons), Lakes Mead and Mohave, Nevada, 2004 and 2006.

[Concentrations are expressed in micrograms per kilogram unless indicated otherwise. Site numbers are shown in figure 1. Abbreviations: <, less than; NA, not applicable]

Compound Sample type: Lab blank   Lab spike
(percent recovered)		   Field blank   Dialysis blank
Date: 2004 2006 2004 2006 05-25-2004 06-16-2006 05-25-2004 05-24-2004 06-13-2006 05-24-2004 05-25-2004 06-13-2006
Site number:     1 1 2 8 10 13 14  
Naphthalene <50 <50 85.10 60.83 <250 18.2 <250 <250 11.7 <250 <250 26.9
2-ethylnaphthalene <50 <50 86.35 73.44 <250 11 <250 <250 8.55 <250 <250 11.6
2,6-dimethylnaphthalene <50 <50 86.87 75.14 <250 17.8 <250 <250 11.5 <250 <250 18.7
1,6-dimethylnapthalene <50 <50 86.59 74.62 <250 14.1 <250 <250 10.9 <250 <250 14.2
Acenaphthylene <50 <50 85.67 70.83 <250 <95 <250 <250 <95 <250 <250 <95
1,2-dimethylnaphthalene <50 <50 87.38 74.14 <250 8.16 <250 <250 7.11 <250 <250 8.25
Acenaphthene <50 <50 85.12 72.11 <250 5.23 <250 <250 4.63 <250 <250 5.03
2,3,6-trimethylnaphthalene <50 <50 87.43 80.58 <250 11.2 <250 <250 9.49 <250 <250 11
9H-Fluorene <50 <50 85.61 75.91 <250 <95 <250 <250 <95 <250 <250 <95
1-methyl-9H-fluorene <50 <50 88.84 85.09 <250 <95 <250 <250 <95 <250 <250 <95
Phenanthrene <50 <50 82.63 78.12 <250 14.7 <250 <250 9.88 <250 <250 14.3
Anthracene <50 <50 82.55 79.10 <250 <95 <250 <250 <95 <250 <250 <95
2-methylanthracene <50 <50 83.19 83.62 <250 <95 <250 <250 <95 <250 <250 <95
4,5-methylenephenanthrene <50 <50 82.84 84.79 <250 <95 <250 <250 <95 <250 <250 <95
1-methylphenanthrene <50 <50 83.74 83.93 <250 <95 <250 <250 <95 <250 <250 <95
Fluoranthene <50 <50 82.92 77.62 <250 8.41 <250 <250 <95 <250 <250 8.66
Pyrene <50 <50 83.01 78.23 <250 7.15 <250 <250 <95 <250 <250 7.13
1-methylpyrene <50 <50 83.91 84.76 <250 <95 <250 <250 <95 <250 <250 <95
Benz(a)Anthracene <50 <50 85.05 72.19 <250 <95 <250 <250 <95 <250 <250 <95
Chrysene <50 <50 86.69 71.73 <250 <95 <250 <250 <95 <250 <250 <95
Benzo(b)fluoranthene <50 <50 88.18 76.56 <250 <95 <250 <250 <95 <250 <250 <95
Benzo(k)fluoranthene <50 <50 85.91 75.70 <250 <95 <250 <250 <95 <250 <250 <95
Benzo(a)pyrene <50 <50 86.12 76.42 <250 <95 <250 <250 <95 <250 <250 <95
Indeno(1,2,3-c,d)pyrene <50 <50 83.74 83.00 <250 <95 <250 <250 <95 <250 <250 <95
Benzo(g,h,i)perylene <50 <50 84.35 78.58 <250 <95 <250 <250 <95 <250 <250 <95
SUM OF PAH <50 <50 NA NA <250 115.95 <250 <250 73.76 <250 <250 125.77

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