Flow-Injection Solid Phase Partial Least-Squares Spectrophotometric Simultaneous Determination of Iron, Nickel and Zinc

Solid phase spectrophotometry (SPS) provides effective methods to combine metal ion preconcentration and their spectrophotometric determination, by integrating the formation of colored complexes and their fixation on the surface of a solid support placed inside the measurement cell. The coupling between flow injection analysis (FIA) and SPS (FI-SPS) makes it unnecessary to reach equilibrium conditions, thus providing faster and more selective methods than those found in batch conditions. Additionally, it offers a simple and easy way of automation and provides low detection limits, small amounts of samples and reagents being employed. Since flow injection analysis was introduced, the simultaneous determination of several analytes in a same sample has been a challenge in order to make FIA competitive with other analytical techniques. In this way, the use of SPS and FIA has been applied in several studies for the determination of binary mixtures of metal ions, amines and mixtures of dyes. Approaches employed for multicomponent determination in solution can be also applied in FI-SPS. Flow-Injection Solid Phase Partial Least-Squares Spectrophotometric Simultaneous Determination of Iron, Nickel and Zinc