相对库仑滴定法是将库仑滴定仪器用于相对滴定法，以代替滴定剂，用消耗的电量代替滴定剂体积，它具有相对滴定法的所有特点．而且，由于没有滴定剂体积的稀释作用，便于离子强度的控制并使得滴定突跃增大，提高了方法的精度．实验结果表明，相对库仑滴定法用子微量有机弱酸的测量具有很高的精度． The relative coulometric titration method uses a coulometric titration instrument for relative titration instead of titrant, replacing the volume of titrant with the amount of electricity consumed, and has all the characteristics of relative titration. Moreover, since there is no dilution of titrant volume, it is convenient to control the ionic strength and make the titration jump increase, which improves the accuracy of the method. The experimental results show that the relative coulometric titration method with sub-trace organic weak acid measurement with high accuracy.