Fig. 2From: Determination of Cu (II) ions using sodium salt of 4-phenylsemicarbazone 1,2-naphthoquinone-4-sulfonic acid in natural and industrial environmentsThe calibration curve for the complex CuL \( \left(A=35356{\displaystyle }{C}_{C{u}^{2+}}-0.044\right) \) Back to article page