Abstract
The effects of potassium or sodium added as the cyclohexanebutyrate and of potassium added as the Conostan standard, on the absorbance of vanadium present as vanadyl tetraphenylporphyrin, acetylacetonate, or benzoylacetonate, or as Conostan vanadium standard in xylene solutions, or in real petroleum samples are described. The effect of the alkali metal depends both on the kind of vanadium compound and on the type of alkali metal compound added. There is no analogy between the behaviour of vanadium in aqueous and xylene solutions containing large amounts of easily ionizable metal. Addition of potassium (or sodium) for the determination of vanadium in xylene solutions cannot be recommended.
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