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From the time selenium was discovered in 1817 by Berzelius, until the recognition in the late 1950s of its toxicity and, subsequently, its essentiality for humans, a large number of its properties have been elucidated. Apart from natural sources (mainly metal-sulfur minerals) selenium compounds can widely spread throughout the environment as a result of combustion of coals and its uses in the glass...
Application of 3,3-dimethylnaphtidine as chromogenic reagent in the flow-injection system with spectrophotometric detection enables the determination of free residual chlorine with sufficient selectivity and detectability with sampling rate 150 samples per hour. The developed method was satisfactorily applied to the analysis of treated water samples, although their limited selectivity to chloramines...
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