Copper residual complexation capacity

Further evidence for organometallic interactions was provided by complexation capacity measurements and pseudo stability constant determinations. Complexation capacity or the residual complexing ability of a natural water sample was determined by complexometric titration of the < 0.4-juLin filtrate with soluble copper (II) (18, 40, 44) followed by ASV measurement of free and labile copper. Plots of ASV peak current vs. the cumulative copper concentration as shown in Figure 9 were made, and the intersection of lines drawn from the intitial and final linear response regions was defined as the residual complexation capacity (43, 44,45). Complexation capacity measurements for fall 1978 are listed in Table VII. The average values for Sites 1-4 were 0.88, 0.99, 0.90, and 1.08 fiM, respectively. 

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