Table 1 Concentrations and other parameters of lipid compounds in aerosol samples (TSP) collected in Beijing.

From: Molecular distributions and compound-specific stable carbon isotopic compositions of lipids in wintertime aerosols from Beijing

 

Whole period

Daytime (n = 15)

Nighttime (n = 14)

Range

Mean

SD

Range

Mean

SD

Range

Mean

SD

I. n-Alkanes

 Conc. (ng m−3)

40.1–1720

367

447

40.1–1440

262

363

55.3–1720

472

514

 CPIa

1.3–2.5

1.5

0.28

1.3–2.5

1.6

0.35

1.3–1.6

1.4

0.1

 CPILMW

1.1–1.5

1.3

0.06

1.1–1.5

1.2

0.08

1.2–1.3

1.2

0.04

 CPIHMW

1.3–4.7

2.6

0.81

1.8–4.7

2.8

0.95

1.3–3.4

2.3

0.54

 %Wax Cnb

10–40

17

0.07

11–40

19

0.08

10–22

15

0.03

 LMW/HMW

0.94–4.5

2.3

0.76

0.94–3.4

2.1

0.82

1.7–4.5

2.5

0.67

II. Fatty acids

 Conc. (ng m−3)

137–3306

871

871

187–3310

733

783

137–2120

1010

966

 CPIa

2.4–7.6

4.8

1.4

2.4–7.6

5.0

1.6

3.1–6.9

4.7

1.1

 C18:0/C16:0

0.5–1.28

0.83

0.24

0.53–1.19

0.84

0.24

0.5–1.28

0.83

0.25

 Csat/Cunsat

1.5–27

12

0.23

1.5–27

14

0.21

1.6–20

11

0.25

 LMW/HMW

1.0–39

10

8.1

2.6–39

12

10

1.0–17

7.7

4.6

III. n-Alcohols

 Conc. (ng m−3)

18.8–613

149

174

24.1–612

109

147

18.8–613

190

205

 CPIa

1.9–10

4.5

2.0

1.9–8.3

4.1

1.6

2.4–10

4.8

2.5

 HMW/LMW

0.97–16

5.5

3.3

1.1–12

5.0

2.6

0.97–16

6.0

3.8

  1. aCPI, carbon preference index, Σodd (C21–35)/Σeven (C20–36) for n-alkanes; Σeven (C20–32)/Σodd (C21–31) for fatty acids; Σeven (C20–32)/Σodd (C21–31) for n-alcohols.
  2. b %WaxCn = Σ(Cn − 0.5(Cn+1 + Cn−1))/ΣCn × 100%. Negative values of Cn were taken as zero.
Back to article page