Simultaneous determination of iron and ruthenium as ternary complexes by extractive second derivative spectrophotometry

A Rapid Determination of Chlorhexidine Digluconate Content in Antimicrobial Preparation by First Derivative Spectrophotometry

“…It is possible to measure the absolute value of the derivative of the sum curve at an abscissa value ( wavelength ) corresponding to a zero-crossing of other components in the mixture. The zerocrossing derivative spectroscopic mode enhances the resolution of the single analyte by recording its derivative spectra at wavelength at which other components in the matrix exhibit no signals [15][16]. This paper reports a method for the rapid determination of chlorhexidine digluconate in an antimicrobial formulation in the presence of other ingredients such as, polymer dispersions, waxes and other additives.…”

Determination of ruthenium in pharmaceutical compounds by graphite furnace atomic absorption spectroscopy

“…Therefore, monitoring and controlling the levels of ruthenium in drug substances are critical. A number of methods have been reported for the determination of ruthenium(III) (Ru III), using spectrophotometry [1], voltammetry [2,3], atomic absorption spectrometry [4][5][6][7][8][9][10][11][12][13][14], and flow injection catalytic method [15].…”

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

“…Zero-crossing measurements for each component of the mixture are therefore the sole function of the concentration of the others. 8 In the previous study an efficient derivative method for the simultaneous determination of palladium and cobalt was established. 9 The satisfactory selectivity for the method was obtained because acidifying of the working solution after complex formation caused decomposition of the other metals-PAN complexes.…”