Spectrophotometeric determination of cadmium(II), mercury(II) and manganese(ll) is carried out with 1-(2 pyridylazo)-2-naphthol as complexing reagent in aqueous phase using non-ionic surfactant Tween 80. The molar absorptivity, Sandell's sensitivity, critical micelle concentration, 1-(2 pyridylazo )-2-naphthol and metal ion concentration are studied. The method has been applied to the determination of these metal ions in municipal sewerage water and pharmaceutical samples.


M I BHANGER ,G A SHAR ,