Spectrophotometric and high-order derivative spectrophotometric study of the indium-1-(2-pyridylazo)-2-naphthol complex in the aqueous phase

Abstract

A spectrophotometric and derivative spectrophotometric study of the indium-1-(2-pyridylazo)-2-naphthol complex in the aqueous phase in the presence of cetyltrimethylammonium bromide, a surfactant, is reported. The molar absorptivity, specific absorptivity and Sandell's sensitivity of the complex at its λ_max. (550 nm) were found to be 1.91 × 10⁴ l mol^–1 cm^–1, 166 l g^–1 cm^–1 and 6.02 ng cm^–2, respectively. Beer's law is valid for the range 5.0 × 10^–6 to 1.0 × 10^–4M ln³⁺.