Fig. 4From: Spectrophotometric determination of Cu(II) in soil and vegetable samples collected from Abraha Atsbeha, Tigray, Ethiopia using heterocyclic thiosemicarbazoneEffect of pH on the absorbance of Cu(II)–3-APT complex at a wavelength of 350 nm; [Cu (II)] = 1 × 10−3 M; [2-APT] = 1 × 10−2 MBack to article page