1Biogeo Pb

Atmosphere

Spedes

Pb, PbO, PbCO_y PbSOy R₄Pb

Conc. 0.001-0.01-10 pg m*³ (particulate)

R₄Pb conc. 0.5-10-200 ng nr³

Pool 15.6x10⁶ kg

/

Deposition 3.2 x 10⁴t y*

Spedes

PbCO_y PbS, PbO, Cd²* in minerals, PbS0₄,Pb₃(P0₄)₂, Pb-S-R, Pb-humic/ fulvic

Biosphere
Spedes
Pb^2*, Pb-S-R
Conc. 0.2-170 pgg^4
(human)
	◄-
1 x 10^51 y-1

Deposition 14 x 10⁴1 y*

1 '
1 0.02 ty^1

2 x 10³1 y¹

▼

Spedes

FbCP, FbCl₃‘, Pb(OH)*, PbCOy Cd-R, Pb sorbed species

Leaching 8 x 10* t y*

In Soil conc. 2-200-2000 pg g** mean 0.4 jig g*¹

In Rocks conc. 0.2-23 pg g⁴

In Oceans nd-13pgl'*

In Fresh water 0.06-120pg l'¹ Pools 42x10⁹ kg

Lithosphere

Hydrosphere

	Weathering 400x10*ty*
Species PbS, PbO, PbCOy PbS04
Pool 4.0xl0*‘kg	Conc. 6-150 pgg*^1
	mean 19 pg g**
Sediments

Fig 5.5 Biogeochemical cycling of lead. External inputs to atmosphere; coal and petrol burning, weathered paint, lead smelting, non-ferrous smelting. To lithosphere and hydrosphere; aerosol deposit, paint. Sources; references 1,6,10,