Abstract
The adsorption of bovine serum albumin (BSA) monomer from 0.7 M NaCl, a model solution for seawater, and from genuine seawater has been measured as a function of time and BSA bulk concentration. The method of out-of-phase alternating current (ac) voltammetry has been used for the measurement of BSA adsorption at three differently charged surfaces of a hanging mercury drop electrode (HMDE). The capacity current depression is read off at the time where no further decrease in the capacity current occurs. The equilibrium adsorption data are treated according to the Langmuir isotherm, the adsorption constant B being evaluated. The value of B for BSA adsorption from 0.7 M NaCl solution of pH 7.0 increases from (3.4 to 7.5 to 13.6) × 10 8 dm 3 mol −1, as the charge of the HMDE surface changes from positive to uncharged to negative, respectively. The value of B for BSA adsorption from seawater of pH 7.8 is (7.0, 5.5 and 9.1) × 10 8 dm 3mol −1, as the HMDE surface charge varies from positive to uncharged to negative, respectively.
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