Which method involves measuring current to detect end points in titration?

Coulometric titration is a method that specifically measures the electrical current produced during the titration process. In this approach, the titrant is generated in situ through an electrolytic reaction, and as the reaction proceeds, the amount of titrant is determined by measuring the electrical current over time. The end point of the titration is detected when a predetermined current level corresponds to the completion of the reaction, allowing for precise quantification of the analyte.

This method is particularly advantageous for trace analysis and can achieve a high degree of accuracy and sensitivity. It is distinct from volumetric titration, which relies on measuring the volume of titrant added to the solution until the reaction reaches its end point. Gravimetric analysis involves precipitating a compound and weighing it, while spectrophotometry focuses on measuring the absorbance of light to determine concentration, neither of which involve current measurement as a means of endpoint detection.