Abstract
A sensitive and selective extraction-spectrophotometric method is proposed for the determination of small amounts of copper. The method is based on the formation of a copper(II)-TBTH complex, which is extractable in benzene from the acetate buffered solution of pH 5.1. The extract is stable for at least 2 h. The complex system conforms to Beer's law for up to 12 μg of copper in 10.0 ml of the benzene extract at 422 nm. The molar absorptivity is 4.4·l0 4 l mol −1 cm −1. Common cations do not interfere.
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