In the presence of DDMAB and in a NH 4Cl NH 3·H 2O buffer medium (pH 9.5), zinc reacts with salicyl fluorone and forms 1∶2 purplish red complex. The maximum absorption of the complex is at 570 nm with an apparent molar absorptivity of 8 71×10 4 L·mol·cm -1 . Beer′s law is obeyed in the range of 0～0.36 mg/L for Zn(Ⅱ). The method has been applied to the determin...
