L1 /   
16
CH3041
MAJOR CHEMICAL PROCESSES
• 
1) Photosynthesis
     2HCO3- + hn  ® {CH2O} + O2(g) + CO32-
  2) Acid - Base
            CO32- + H2O ®  HCO3- + OH-
3) Precipitation           (reverse is dissolution)
            Ca2+ + CO32- ® CaCO3(s)
4) Microbial action   (usually redn in anaerobic)
            2{CH2O} + SO42- + 2H+® H2S(g) + 2H2O + 2CO2
5) Redox                   (often microbe mediated)
    NH4+            «          NO3-
6) Complexation / Chelation  Fe(H2O)63+
O2       Gas exchange with the ATMOSPHERE
                   Uptake
       Leaching
SEDIMENT (solid)
SOLUTION
C
O
L
L
O
I
D
CO2
< 1mm