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I was doing experiment of estimation of copper and nickel ions by means of volumetric and gravimetric analysis respectively.

Suppose we analysed $\ce{Cu^2+}$ ions by precipitating with $\ce{H2S}$ But still there are some copper ions remaining in solution.

Is there possibility that they ($\ce{Cu^2+}$) can form complex with DMG and interfere with Ni-DMG complex.

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  • $\begingroup$ In this paper such complex is mentioned, so I guess that it's possible scielo.br/… $\endgroup$
    – user32223
    Commented Aug 10, 2016 at 18:51

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Copper can form a stable DMG complex (if it is there in the mixture in high concentration), it may also effect the color of the resultant Ni-DMG complex. Just go through Vogel's quantitative inorganic analysis book once.

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