Extraction-spectrophotometric determination of traces of copper(II), zinc(II), cadmium(II) and mercury(II) with 2-(5-bromo-2-pyridylazo)-5-diethylaminophenol

A Novel Poly(vinyl chloride) Matrix Membrane Sensor for Batch and Flow-Injection Determinations of Thiocyanate, Cyanide and Some Metal Ions

“…The reaction of copper(II) with 5-Br-PADAP in an acidic medium of pH 3.2 gave a charged complex 31,35 with the composition [Cu(II)R(R-H)] + (Fig. 1).…”

Trace mercury determination in drinking and natural water samples by room temperature ionic liquid based-preconcentration and flow injection-cold vapor atomic absorption spectrometry

“…The pH was varied by adding diluted HCl or NaOH solutions. Although stoichoimetry of Hg-5-Br-PADAP is already known and reported by previous work [24], it was tested pH values in the acid range in order to investigate which 5-Br-PADAP species are extracted by the RTIL. The results illustrated in Fig.…”

Zero- and First-Order Derivative Spectrophotometry for Individual and Simultaneous Determinations of Copper(II) and Palladium(II) Using an Oxazolidine Derivative as a New Reagent

“…In an aqueous medium, the molar absorptivities of Cu(II) and Pd(II) complexes, calculated from the slopes of regression lines, were 1.05´10 4 Cu(II) and Pd(II) are lower than those obtained in an aqueous medium. Thus, the determination of Cu(II) or Pd(II) in a micellar medium is more precise than that in an aqueous medium.…”