Flowmeter based on measurement of streaming potentials

Several of today's high-performance analytical techniques are based on the constant and pulse-free delivery of liquid to the system performing the analysis. In flow injection analysis (FIA), for example, the system is generally a mixing device where reagents and sample meet and react prior to entering a detector for on-line quantification of a given product. Field-flow fractionation (FFF), in turn, is a family of one-phase separation techniques whose performance is based on the coupled interactions of a field and a perpendicular flow with the sample to be separated. Both of these techniques, as well as many high-resolution chromatographic systems, depend on a steady liquid flow for optimal performance and for accuracy in the produced analytical information.

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