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Solid-Phase Reflection Spectrophotometric Determination of Cadmium(II) with PVC Functional Membrane

Solid phase reflection spectrophotometric determination of Cd(Ⅱ) with PVC functional membrane was studied. It was found that cadmium(Ⅱ) could react with 1 (2 pyridylazo) 2 naphthol (PAN) dissolved in the PVC functional membrane and the formed complex could be determined by solid phase reflection spectrophotometry. The linear relationship between A R and c was obtained for Cd concentration from 0 to 5.0 μg/mL with detection limit of 0.015 μg/mL and relative standard deviation of 1.4%. The method was successfully applied to determination of Cd in mineral samples.