Average concentrations С_r, mg/l

Chemical runoff

P_r, ton/year

Selenga

Other tributaries

Major ions

Na⁺

5800

3600

276 × 10³

$S{O}_4^{2-}$

17,000

6000

673 × 10³

Cl⁻

2200

780

87 × 10³

Trace elements

Al

36

40

2244

Cr

0.22

0.5

21

Mn

3.3

7

306

Fe

22

70

2 740

Co

0.05

0.05

3,0

Cu

0.64

1.7

70

Zn

6.2

4.3

309

Mo

0.8

1.7

74

Pb

0.21

1.0

36