Abstract
In the article, various methods of flow injection and sequential injection analyses are considered. The relative advantages and disadvantages are investigated. The stepwise injection analysis is proposed as a new universal flow method of analysis which means maximum strict reproduction of all the analytical stages which are typical for automated stationary methods. The opportunities of the new method which can be applied to the sample analysis in any aggregative state are illustrated by the examples of phosphateions in urine, anionic surfactants and nitrate- and nitrite-ions in water, hydrogen sulfide in hydrocarbon gases, and phosphates in water-soluble mineral fertilizer.
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