Automation of a flow-injection system for multispeciation

Differentiating between the two most frequent oxidation states ofchromium is fundamental in speciation studies of this element on account of the toxicity of hexavalent chromium. In fact, most of the works on this element published so far deal solely with this aspect [1]. Flowinjection analysis (FIA) has been used several times for determining this element in one [2 and 3] or in its two most common oxidation states [4-10].