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Cloud-point extraction, preconcentration, and spectrophotometric determination of palladium in water samples

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The possibility of using Thio-Michler's Ketone (TMK), 4,4′-bis(dimethylamino) thiobenzophenone, for palladium(II) concentrated by micellar extraction at the cloud-point temperature, and later spectrophotometric determination, was investigated. Under the optimum conditions, preconcentration of 50 mL of water samples in the presence of 0.1% (w/v) octylphenoxy polyethoxy ethanol (Triton X-114), 2 x 10–6 mol L–1 TMK and 1 x 10–3 mol L–1 buffer solution (pH = 3.0) gave the limit of detection of 0.47 ng mL–1, and the calibration graph was linear in the range of 2–50 ng mL–1. The recovery under optimum working conditions was higher than 97%. The proposed method has been applied to the spectrophotometric determination of palladium(II) in natural water samples after cloud-point extraction with satisfactory results.

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Keywords: Micellar extraction; Natural water samples; Palladium; Spectrophotometric determination

Document Type: Research Article

Affiliations: 1: School of Chemistry, University College of Science, University of Tehran, Tehran, Iran 2: Department of Analytical Chemistry, Faculty of Chemistry, Iran University of Science and Technology, Tehran, Iran

Publication date: December 10, 2006

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