[B] ^^ , = TDECF * [B], .^ , 

 predicted initial 



= 7.95* 43.18 mga 

 = 343.30 mgf\ 



The above calculation demonstrates the use of the TDECF formulae in the calculation 

 of a predicted boron concentration for Pryse CELL 2 SE. The calculated result for this example 

 is shown on the appropriate chart in figure 6.5. The primary variables in this calculation are the 

 initial and final dates because these are what determine the ECF value. 



Extended Application of TDECF 



The results presented in this report focus on the changes in pond water concentrations 

 between the initial and final sampling dates. However, a more extensive approach is possible 

 by altering the final date used in the TDECF calculation. An example of this extension is shown 

 in the figure below in which lL/15/86 is retained as the initial date, and the TDECF calculation 

 is performed on data firom Pryse Cell 2 SE. 



400 



E 



300 - 



c 

 o 

 ^ 200 



CO 



c 



0) 



o 



c 

 o 

 o 



c 

 o 



o 



CD 



100 

 



Observed [B] 

 Predicted [B] 



00 



in 



00 



00 



in 



CO 

 00 



o 



00 

 CO 



^— 



in 



CO 

 00 



00 



00 



o 



CNI 



in 



Figure 6.3. Results of TD-ECF Calculation for Pryse Cell 2 SE using multiple final dates. 



Figure 6.3 indicates that B is well conserved through the seasons with the exception of 

 the summer 1988 case in which the concentration is many times higher than previous values. 



page €.3 



