Zero‐Crossing Second Derivative Spectrophotometry for Simultaneous Determination of Palladium and Nickel Using 1‐(2‐Pyridylazo)‐2‐Naphthol in Mixed Micellar Solutions

Abstract

1-(2-Pyridylazo)-2-naphthol (PAN) has been used for the simultaneous determination of nickel and palladium at trace levels. PAN complexes of nickel and palladium in the pH 1.98 form red and green colored complexes, respectively, which are soluble in aqueous 4:1 Triton X-100 to sodium dodecylsulfate (SDS) micellar media with total detergent concentration of 3.2%. Under optimum conditions, calibration graphs for the simultaneous determination by second derivative spectrophotometry were obtained. Zero crossing second derivative spectrophotometry at 668 and 572 nm, respectively for palladium and nickel was used for the simultaneous determination. The method is able to determine palladium to nickel ratio 70:1 to 1:6 (Wt/Wt), accurately. Accuracy and reproducibility of the determination method on the known various amounts of palladium and nickel in their binary mixtures were tested. Effects of diverse ions on the determination of palladium and nickel to investigate selectivity of the method also were studied.

Production of phenylalanine-reduced soymilk for phenylketonuria patients

“…Derivative spectra are produced by processing spectrophotometer output. The use of derivative spectra increases the sensitivity of detecting small spectral features and reduces the error caused by overlapping of analyte spectral bands by interfering with bands of other species in the sample (Eskandari et al, 2006). The differentiation process in ultraviolet (UV)-visible field spectroscopy is applied as follows: Tas ¸demir Y and Gölge E final product after removal of Phe (Pearson, 1970).…”