216
Fig. 8.19. The inorganic and
organic speciation of Cu(II) in
sea water at S = 35 and 25°C
Inorganic speciation of Cu 2 +
CuC0 3
Organic speciation of Cu2+
CULl
Cu 2 + + Ll = CULl
Cu 2 + + L2 = CuL 2
Kl =10 12
K2 = 10 9
F. Millero . D. Pierrot
CuC0 3
CuL 2
Table 8.7. Concentration and stability constants for Fe(III) organic complexes in sea water
Region
[L1T(nM)
[FelT (nM)
logK FeL
Reference
Menai Straits
4-10
3.5-8.5
21.3
Gledhill and van der Berg (1994)
Atlantic
3-5
0.8-1.8
19.3
Gledhill and van der Berg (1994)
Atlantic
0.4-0.6
0.17-0.27
23.2
Wu and Luther (1995)
Pacific
0.4
0.2-0.8
23.1
Rue and Bruland (1995)
Mediterranean
4-13
3.1
21.8
van den Berg (1995)
ligand was only present in surface waters. Because the concentration of inorganic forms
of Cd varies from 0.7 to 800 pM in surface to deep waters, the concentration of free
Cd ranges from 20 fM in surface waters to 22 pM in the deep.