A simple recoverable titration method is described for quantitative characterization of amine functions attached to the carbon nanotubes (CNTs). This titration is a two-step method, originated from the alkaline nature of amine functions. The amount of amine functions on CNTs determinate by titration method showed a good quantitative agreement with those of thermogravimetric analysis. Interestingly, the titrated samples could be easily recovered to their original activities, with a simple base treatment. Based on simplicity and minimum spent time, this method is suggested for characterization of amine functionalities attached on carbon nanotubes as well as all graphitic nanostructures.

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