by solid phase spectrophotometry (SPS) was optimized using the Doehlert design. Copper(II) was sorbed on a styrene-divinylbenzene anion-exchange resin as a Cu(II)-1-(2-pyridylazo)-2-naphthol (PAN) complex, at pH 7.0. Resin phase absorbances at 560 and 800 nm were measured directly. The detection limit was found to be 2.5 μg L -1 . The relative standard deviation on ten replicate determinations of 10 μg Cu(II) in 1000 mL samples was 1.1%. The linear range of the determination was 5.0-100 μg L -1 . The method w… Show more
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