寻常的电解分析是用一定的电压加诸阴阳极间后,即让电解进行,毋须注意其电流密度的变动。如在电解过程时常增加电压,使电流密度维持一定值,那末这种方法称为恒电流电解法。恒电流电解法适用于溶液中只有一种可沉积的金属,亦适用于分离电动次序表中氢以下与氢以上的金属,但对于电动次序表中相接近的金属是无法分离的。如铜与锡在酸性溶液中,当前者沉积后,后者亦开始沉积。这种缺点,如改用控制电势电解法就可克服。控制电势电解法虽然比较复杂,但电势的控制可以自动化,所以应用时很方便,最近几年发展,已应用到日常的分析工作中了。 Ordinary electrolytic analysis is applied to a certain voltage between the anode and cathode, so that electrolysis, without notice of its current density changes. If the electrolysis process often increase the voltage, the current density to maintain a certain value, then this method is called constant current electrolysis. The galvanostatic method is suitable for use with only one metal that can be deposited in a solution. It is also suitable for separating metals below hydrogen and hydrogen in an electrokinetic order list, but can not be separated for metals in close proximity to the electrokinetic order table. Such as copper and tin in acidic solution, the current deposition, the latter also began to sediment. This shortcoming, such as the use of control potential electrolysis can be overcome. Although the control potential electrolysis method is more complex, but the potential control can be automated, so the application is very convenient, the development in recent years, has been applied to routine analysis.