corresponds to the oxidative peak current obtained using a heat treated sample the procedure of example 1 was repeated using a solution of t butylferrocene in 2 wt dtab in a ph7 phosphate buffer fig1 shows as a solid line the voltammogram obtained with a sample heated to 150 u00b0 c for 24 hours superimposed on the voltammogram obtained with a control sample broken line it will be seen that the curve obtained with the heat treated sample is almost indistinguishable from the control the conclusion is that there was no observable degradation over 24 hours even at 150 u00b0 c voltammetry was carried out at a number of scan rates fig2 shows a plot of oxidative peak current against square root of scan rate the plot is a straight line which is evidence that the oxidative and reductive processes are both diffusion controlled this example demonstrates the coupling of concentration to the voltammetric response of vinyl ferrocene in micellar solution a micellar solution of vinyl ferrocene in a solution of 2 wt dtab in deionised water was made as in example 1 and subjected to 150 u00b0 c for 43 hours a 0 05 molar solution of sodium sulphide in water was prepared this solution was added by 20 u03bcl or 40 u03bcl increments to 10 ml of the micellar solution of vinyl ferrocene after each addition the voltammetric response was recorded as in example 1 using a bdd electrode the observed voltammetric response is similar in form to voltammetry observed with ferrocene compounds in the presence of sulfide when surfactant is absent it is consistent with the vinylferrocene undergoing an electrochemical oxidative process and the oxidized form being reduced back to vinylferrocene by reaction with bisulfide ion.