الخلاصة

ABSTRACT UV-Vis. spectrum for complexes of Zn (II) and Co (II) extracted according to onium system from acidic HCL solution by use 2,4-dimethylpentan-3-one (2,4-DMP) as onium complex was (262nm) for Zn(II) but onium complex for Co(II) was (243nm), this method show need 0.5M HCL for extraction Zn2+ and 0.8M HCL for Co2+, as well giving obey to Beer-Lambert relation at the (1-20µg) for Zn2+ and (1-50µg) for Co2+. The onium complex extracted have structure H(H2O)(2,4-DMP)3+;HZnCl4-, H(H2O)(2,4-DMP)3+;HCoCl4-. This method obey to Beer-Lambert relation at the range (1-20µg) for Zn2+ ε=16893.56L.mol-1.cm-1, D.L=6.33×10-6µg/Ml, RSD%=0.0069µg/Ml, Sandell’s sensitivity=3.87×10-9µg/cm2 and (5-50µg) for Co2+, ε=8918.77L.mol-1.cm-1, D.L=3.38×10-5 µg/Ml, RSD%=0.00664µg/Ml, Sandell’s sensitivity=7.33×10-9µg/cm2. As well as this research involved many studies and apply for determination Zn2+ and Co2+ in different samples.