Ultraviolet Spectrophotometric Determination of Nickel with α-Benzil dioxime.

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Abstract
A new method described here involves the extraction of nickel (II)-benzildioxime with chloroform and the spectrophotometric measurements of the colored system in the same solvent. The wide pH range for the extraction eliminates the use of a buffer, and nickel is readily separated from ferric iron, aluminum, zinc, chromate, vanadate, and molybdate ions. By obviating the excessive benzildioxime with dilute alkali, the most sensitive absorbance readings are achieved, and the sensitivity at 275 mμ is 0.0013. Beer’s law holds up to 1 p. p. m. of nickel at 275 mμ, and up to 4 p. p. m. at 358 and 406 mμ. The nature and degree of interference of copper and cobalt on the color development are also discussed, and their allowable amounts are determined.

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