Table 1 The concentrations (μg/g) of trace metals in PM (mean ± SD)

S

49,583.9 ± 1112.2

50,692.3 ± 5236.4

57,164.0 ± 2584.2

K

11,494.5 ± 371.0

10,601.9 ± 226.6

9449.2 ± 75.1

Ca

6307.2 ± 324.3

7740.1 ± 580.5

16,752.0 ± 1037.5

Ti

5568.8 ± 384.0

2662.4 ± 223.4

3377.9 ± 91.9

P

4301.3 ± 186.9

3586.2 ± 246.6

3667.0 ± 155.4

Fe

3870.9 ± 129.7

4971.2 ± 360.3

9860.8 ± 360.4

Mg

2337.8 ± 236.1

1964.7 ± 249.2

4207.8 ± 231.2

Al

1740.8 ± 20.1

2543.4 ± 817.8

6317.7 ± 196.1

Zn

1024.9 ± 52.8

1003.0 ± 86.2

1450.6 ± 63.7

Mn

378.7 ± 20.3

463.8 ± 17.8

535.5 ± 9.4

Ba

224.3 ± 8.5

138.8 ± 53.1

276.6 ± 12.2

Pb

695.4 ± 38.7

514.9 ± 123.6

549.5 ± 9.4

Cu

395.6 ± 12.6

360.4 ± 134.3

1029.4 ± 48.0

Cr

130.7 ± 14.6

116.3 ± 50.6

194.2 ± 105.2

Sb

66.4 ± 2.2

53.7 ± 16.5

72.3 ± 3.9

Se

61.3 ± 0.6

37.3 ± 5.5

33.1 ± 3.0

As

58.1 ± 1.7

48.7 ± 17.2

99.6 ± 10.9

Sn

54.9 ± 2.5

40.6 ± 9.9

55.1 ± 2.1

Ni

53.1 ± 5.0

34.9 ± 9.8

44.8 ± 0.03

Sr

39.3 ± 1.4

44.3 ± 20.8

176.0 ± 26.1

Li

34.0 ± 2.1

25.4 ± 1.5

19.3 ± 0.8

Rb

30.2 ± 0.7

29.1 ± 11.7

37.6 ± 0.8

Mo

20.2 ± 0.2

14.7 ± 4.0

30.9 ± 1.0

Cd

14.8 ± 0.5

12.8 ± 4.4

21.2 ± 7.0

Co

13.0 ± 1.1

12.3 ± 5.9

21.6 ± 3.3

Ce

9.8 ± 0.5

4.6 ± 0.2

12.6 ± 0.4

W

9.4 ± 0.1

10.0 ± 4.5

18.3 ± 0.6

Cs

3.6 ± 0.1

3.4 ± 1.4

4.6 ± 0.1

Ag

3.0 ± 0.3

2.4 ± 0.9

4.1 ± 0.3

Pd

0.9 ± 0.5

0.3 ± 0.1

0.8 ± 0.2

Gd

0.6 ± 0.1

0.5 ± 0.1

1.2 ± 0.1

Th

0.3 ± 0.1

0.2 ± 0.1

1.1 ± 0.01

U

0.1 ± 0.04

0.2 ± 0.1

0.6 ± 0.1

Pt

0.1 ± 0.1

0

0.1 ± 0.01

Eu

0.1

0.04 ± 0.01

0.1