Table 2 The geochemical indices of n-alkanes in different oilfield soils.

From: Fingerprint analysis reveals sources of petroleum hydrocarbons in soils of different geographical oilfields of China and its ecological assessment

Samples

∑n-alk/n-C16

CPI

n-C17/Pr

n-C18/Ph

Pr/Ph

S1

60.07

4.29

nd

nd

nd

S2

41.31

3.54

1.64

0.95

0.74

S3

42.42

2.27

0.88

0.73

1.16

S4

28.02

1.92

0.93

0.95

0.99

S5

30.62

3.03

2.24

1.04

0.61

S6

48.36

3.88

1.67

1.23

2.34

S7

27.14

1.19

2.48

2.94

1.21

S8

25.58

1.29

2.54

2.96

1.18

S9

28.36

1.08

2.64

2.21

1.05

S10

26.6

1.15

2.33

2.07

1.13

S11

25.85

1.31

2.88

2.96

1.22

S12

24.03

1.24

2.41

2.05

1.14

N1

67.24

4.25

nd

nd

nd

N2

22.24

1.03

2.42

2.37

1.28

N3

23.65

1.27

2.34

3.23

1.12

N4

28.92

2.32

0.82

0.53

0.86

N5

22.57

1.44

2.37

2.03

1.17

N6

46.23

3.48

nd

nd

nd

N7

60.21

4.72

nd

nd

nd

N8

29.13

1.24

0.82

0.72

0.68

N9

25.58

1.18

2.73

2.35

1.03

N10

23.29

1.32

2.94

2.83

1.16

Y1

26.17

1.23

0.92

0.82

0.83

Y2

60.32

4.82

nd

nd

nd

Y3

25.21

1.57

2.83

2.34

1.23

Y4

30.13

2.32

1.82

1.24

1.31

Y5

28.25

1.98

0.67

0.53

0.94

Y6

23.33

1.72

2.46

2.39

1.15

Y7

52.15

4.98

nd

nd

nd

Y8

54.32

5.24

nd

nd

nd

Y9

57.42

3.98

nd

nd

nd

Y10

27.23

1.23

2.13

2.34

0.84

Y11

58.25

4.89

nd

nd

nd

Y12

60.14

4.38

nd

nd

nd

Y13

52.19

5.39

nd

nd

nd

Y14

57.45

4.62

nd

nd

nd

Y15

23.45

1.83

2.88

1.93

1.27

Y16

55.46

3.82

nd

nd

nd

Y17

61.31

4.72

nd

nd

nd

Y18

57.49

5.31

nd

nd

nd

Y19

55.42

4.92

nd

nd

nd

Y20

28.31

2.14

1.92

2.25

1.24

Y21

23.56

1.92

0.92

0.56

0.88

Y22

52.34

3.24

nd

nd

nd

Y23

24.16

1.88

0.76

0.57

0.95

Y24

28.32

2.16

2.12

2.82

1.58

Y25

57.23

4.55

nd

nd

nd

  1. ∑n-alk/n-C16: Sum of n-alkanes (C8-C40) over to n-alkane (C16); CPI: odd to even carbon preference index from n-C8 to n-C40; C17/Pr: ratio of n-alkane (C17) to pristane; C18/Ph: ratio of n-alkane (C18) to phytane; Pr/Ph: ratio of pristane to phytane; nd: not detected.
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