There is a pressing need to expand the scope of continuous flow techniques, particularly to some unusual applications where normal flow injection analysis modes and completely continuous procedures are useless. In this context, the flow-rate gradient technique plays a major role, because it enables automation and greater speed than the time-consuming and tedious batch procedures. The automatic determination of physico-chemical parameters is one case in point: its broad range of possibilities makes fertile ground for the application of the flow-gradient technique with interesting analytical results.