88 



R. T. Prentki et al. 



0.50 

 0.40 



I 



^ 0.30 



To.zo 



0.10 - 



8.0 



7.0 



Q. 



6.0 



FIGURE 4-7. Alkalinity and pH in five ponds. 



Total CO2 was estimated in two ways: by calculation and after a 

 conversion to gaseous CO2. The calculation was made from pH and 

 alkalinity data and from the equations and apparent dissociation 

 coefficients given by Skirrow (1965). In the conversion method, a small 



