Ecological Systems Containing Hydroxy Acids

Experimental data count in favor of the second mechanism (for details, see our article [62]). Thus, the process following the discharge of adsorption layer should involve the reduction of AufCN) diffusing from the bulk of solution. 

The standard rate constant can be determined by the Eq. (5.7) that for the charge transfer process (Eq. (8.13)) takes the form of 

For a temperature of 20 °C, we obtained = 10 (cms )(molcm ) . This value is 39 times lower than the value obtained for 60 °C [56]. One can see when comparing these values that increases on an average by a factor of 2, 5 for each decade of temperature. This is in harmony with the widely known range of temperature coefficients of chemical reactions. The values found for a also are within the range of literature data [58]. 

HA are capable of forming quite stable coordination compounds with metal ions. Considerable recent attention has been focused on such substances, because they can be industrially applied without a negative impact on environment. The most often considered ligands are  

Considering the different pH effects, it can be assumed that the first partial process is Cu(II) reduction whereas the hydrogen evolution could be the second process. To verify this supposition, the voltammograms recorded directly were compared with those obtained from EQCM data. 

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