Hg

As

Pb

Cd

Zn

Cu

Cr

January

ST

139.4

90.62

9.9

731.39

18031.8

500.56

86.05

OS

12.12

27.19

0.94

14.72

386.5

15.68

150.82

April

ST

969.7

193.75

28.1

1269.72

20283

779.28

151.5

OS

212.12

40.62

3

43.05

966.75

51.12

191.98

July

ST

470.59

123.81

27.5

1024.33

10947.1

515.68

107.7

OS

156.86

48.86

4.9

67.7

724.1

69.70

263.2