The optical response in electrochromism is defined as the time that required to obtain 90 % of the needed coloration. Can I use some kind of analogy? Any experiences?
Under certain circumstances it is possible. In a flow system you just take the time you need to reach 90% of stable maximum current (t90), but you have to be shure that nothing else influences your system and you are always restricted by the flow rate (how fast changes the concentration of the analyte in your system). In batch systems you may use the time to reach peak current, but there may be more unknown factors influencing your signal as the composition of the whole system changes over time.
The response time as the delay time between the rise of the increase analyte concentration and the rise variation of the current signal taken at 90% of the total variation. For a chronoamperometry can obtain electrochemical sensor response time from chronoamperogram.
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