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I. INTRODUCTION
A. What Is Flow Analysis?
To most workers in the field of flow analysis it appears to be self-explanatory that what they are doing is flow analysis (FA), and they will easily quote many advantages of their system. Nevertheless, it is not easy to properly define what flow analysis is. Even more difficult is defending its advantages against other semiautomatic or automatic analysis methods, in general, because of the wide variety and the fast development of both FA and other instrumentation. A very broad definition of FA might be that in flow analysis the transport of the sample from the place of sampling to the waste (or back to the sampling area in case of recirculation) through stages of various kinds of manipulation like separation, chemical reaction, heating or cooling, detection, etc. is done by imparting the sample or an aliquot of it into a flowing stream. The flow moves the sample through the spatially separated stages of the analysis process in an automatic way.