Quantitative analysis (electrogravimetry): 

Same to gravimetric methods, electrogravimetric methods are also extremely precise & accurate. This method includes deposition of the desired metallic component upon a previously weighed cathode, followed through following reweighing of the electrode plus deposit to acquire through difference the quantity of the deposited metal. A few times, some degree of selectivity using potential could also be achieved in these methods. These methods could also be used in determination of metal from their mixture using successive deposition of metal on cathode through changing applied potential.  For instance, electrogravimetric methods are often used in analysis of copper based alloys. Through careful control of the cathode potential, the pH and concentration of complexing agents, Cu, Bi, Pb, and Sn could be successively deposited from the similar solution. For instance, electrolysis at - 0.30 V (vs. SCE) of a solution, buffered to pH 5 and holding 0.25 mole dm^-3  tartarate, deposits copper. Additional reduction of the similar solution at - 0.4 V deposits bismuth and at - 0.60 V, lead. All these three components are deposited from a neutral solution holding tartarate ions that would complex tin (IV) and avoid its deposition. tin is deposited if the solution is then acidified along with HCl and deposition is permitted at - 0.65 V. If each time the cathode is washed, removed, dried and weighed after every step, the amount of each of four metals in the original sample might be determined. If a sample along with above mentioned metals also holds cadmium and zinc, after that we have to follow the similar procedure and while lead deposition is complete, the solution is made tightly ammoniacal and cadmium and zinc are deposited successively at - l.2 V and   - l.5 V in that order.  At last, the solution is acidified to decompose the tin- tartarate complex and tin is deposited at a potential of - 0.65 V by using a fresh cathode.