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- [37] High-performance liquid chromatographic-spectrophotometric determination of copper(II) and palladium(II) with 5,10,15,20-tetrakis(4N-pyridyl)porphine following homogeneous liquid-liquid extraction in the water-acetic acid-chloroform ternary solvent system ANALYTICA CHIMICA ACTA, 2000, 424 (02) : 263 - 269