A method for the determination of copper(II) was studied by the substitution of the lead(II) complexes of ethyleneglycolbis (2-aminoethylether)-
N,
N,
N',
N'- tetraacetic acid (GEDTA) for copper(II). Each 5ml of 1M sodium perchlorate and 1.0×10
-3M lead(II)- GEDTA was taken into a 50ml measuring flask, added 25ml of a sample solution containing (0.26.4)μg/ml of copper(II), adjusted the pH of the mixed solution to 1.8, and diluted to 50ml with water. The absorbance was measured at 260nm after 2min. Both linear calibration curves were obtained in the range of (0.13.2)μg/ml of copper(II), and (0.16.4)μg/ml of copper(II) respectively, when 1.0×10
-4M Pb-GEDTA, and 5.0×10
-4M Pb-GEDTA were substituted for each other. The following amounts (μg/ml)of diverse ions were allowed for the determination of 1.27μg/ml of copper(II): Ca(II)56, Mg(II) 49, Ba(II)137, Co(II) 59, Mn(II) 77, Ni(II) 59, Zn(II) 131, Cd(II) 90, Be(II) 5, Zr(IV) 46, Pb(II) 62, Hg(II) 4, Al(III) 5, Ga (III) 2, In(III) 2, Cl
- 106, SO
42- 192, NO
3- 37μg/ml. Even though either iron(III) or bismuth(III) was presented up to 0.1μg/ml, they interfered respectively.
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