Both Segmented Flow Analysis (SFA) and Flow Injection Analysis (FIA) are continuous flow methods that rapidly process large numbers of samples. SFA and FIA utilize the same basic operation including a peristaltic pump that continuously merges samples and reagents in exact proportions that are determined by the internal diameter of plastic pump tubing. All continuous flow methods allow automated dilution, filtration, digestion, dialysis, derivitization, and/or incubation. The primary difference between SFA and FIA is that SFA mixes by turbulence produced by the introduction of a segmentation gas (bubbles) and FIA relies on dispersion and generation of an asymmetric Gaussian shaped color gradient with a detector response being proportional to concentration.