Fig. 1From: Determination of Cu (II) ions using sodium salt of 4-phenylsemicarbazone 1,2-naphthoquinone-4-sulfonic acid in natural and industrial environmentsThe absorption spectrum of L, copper (II) ions, and complex CuL, C L = 4∙10‾4 mol/L, c(Cu 2+) = 4∙10‾5 mol/L, pH 6.4, acetate buffer, absorption maximum of L at wavelength of 440 nm, and absorption maximum of CuL at wavelength of 520 nmBack to article page