Gasoline-Related Compounds in Lakes Mead and Mohave, Nevada, 2004

Scientific Investigations Report 2007–5144

Table 7. Concentrations of PAH (polycyclic aromatic hydrocarbon) compounds detected in lake- and stream-bottom sediment samples, Lakes Mead and Mohave, Nevada, 2004–06.

[Concentrations are expressed in micrograms per kilogram. Site numbers are shown in figure 1. Abbreviations: %, percent; <, less than; E, estimated concentration; NA, not analyzed]

Compound	Date:	Lab spike % rec.	Lab blank	11-02-2006	11-02-2006	11-02-2006	03-30-2006	03-29-2006	03-29-2006	03-30-2006	04-05-2006	03-29-2006	03-02-2006	04-04-2006	03-29-2006	03-29-2006
Time:	0925	0950	1040	1500	1024	1115	1200	0950	1115	1120	0840	1450	1500
Site number:	1	2	4	10	13	13	18	19	20	20	21	22	22
benzo(a)pyrene		43	<100	<17	<11	<26	<100	<100	<100	<100	<100	181	366	<100	<100	<100
fluoranthene		101	<100	E6.9	<11	<26	<100	<100	<100	<100	<100	125	287	116	<100	<100
naphthalene¹		65	E4.81	<13	<11	<26	E0.13	E0.7	E0.32	<25	E0.43	E2.52	E1.15	E0.25	<25	E0.09
phenanthrene		84.4	<50	E1.3	<11	<26	<50	<50	<50	<50	<50	E43	E35.7	32.5	<50	<50
pyrene		97	<100	E7.1	<11	<26	<100	<100	<100	<100	<100	107	256	103	<100	<100
2-methyl naphthalene		74.2	<25	NA	NA	NA	<25	<25	<25	<25	<25	E17.4	<25	<25	<25	<25
2,6-dimethylnaphthalene		83.4	<25	81.8	21.5	134.0	34.5	<25	40	30.5	30.7	37.7	35.4	36.5	34.9	32.5
1,6-dimethylnaphthalene		NA	NA	<13	<11	E21.2	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
Perylene		NA	NA	<13	E5.9	<26	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
SUM OF PAH		NA	4.81	97.1	27.4	155.2	34.63	0.7	40.32	30.5	31.13	513.62	981.25	288.25	34.9	32.59
Surrogate Recovery
naphthalene-d8²		69.1	31.3	69.73	58.04	70.20	46.4	43.5	45.7	46.3	52.1	47.2	44.1	37.2	41.2	33.5
Acenaphthalene-d10²		79.2	67.3	68.60	70.21	82.80	62.0	47.9	44.1	55.5	62.3	59.0	56.8	43.8	56.2	42.5
Chrysene-d12²		108	112	84.57	89.89	89.17	93.76	90.9	93.2	91.4	83.7	100.6	95.37	82.2	93.7	77.34

Compound

Date:

Lab spike % rec.

Lab blank

11-02-2006

03-30-2006

03-29-2006

03-30-2006

04-05-2006

03-29-2006

03-02-2006

04-04-2006

03-29-2006

Time:

0925

0950

1040

1500

1024

1115

1200

0950

1115

1120

0840

1450

1500

Site number:

benzo(a)pyrene

<100

<17

<11

<26

<100

181

366

<100

fluoranthene

101

<100

E6.9

<11

<26

<100

125

287

116

<100

naphthalene¹

E4.81

<13

<11

<26

E0.13

E0.7

E0.32

<25

E0.43

E2.52

E1.15

E0.25

<25

E0.09

phenanthrene

84.4

<50

E1.3

<11

<26

<50

E43

E35.7

32.5

<50

pyrene

<100

E7.1

<11

<26

<100

107

256

103

<100

2-methyl naphthalene

74.2

<25

E17.4

<25

2,6-dimethylnaphthalene

83.4

<25

81.8

21.5

134.0

34.5

<25

30.5

30.7

37.7

35.4

36.5

34.9

32.5

1,6-dimethylnaphthalene

<13

<11

E21.2

Perylene

<13

E5.9

<26

SUM OF PAH

4.81

97.1

27.4

155.2

34.63

0.7

40.32

30.5

31.13

513.62

981.25

288.25

34.9

32.59

Surrogate Recovery

naphthalene-d8²

69.1

31.3

69.73

58.04

70.20

46.4

43.5

45.7

46.3

52.1

47.2

44.1

37.2

41.2

33.5

Acenaphthalene-d10²

79.2

67.3

68.60

70.21

82.80

62.0

47.9

44.1

55.5

62.3

59.0

56.8

43.8

56.2

42.5

Chrysene-d12²

108

112

84.57

89.89

89.17

93.76

90.9

93.2

91.4

83.7

100.6

95.37

82.2

93.7

77.34

¹ Concentrations reported for environmental samples are corrected for contamination by subtracting blank concentration from environmental sample concentrations.

² 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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