1993¹⁹

1996³⁵

2008¹⁸

2010⁴³

2013-this study

As (ug/L)

10

6.3

20.6

47.99

10.33

Sb (ug/L)

78

36.4

219

22.80

13.45

Tl (ug/L)

2.2

1.9

-

-

7.47