The anodic behavior of a thin mercury film electrode in the presence of chloride ions has been investigated by cyclic voltammetry. These studies were extended and applied for the determination of chloride concentration in various matrices like thorium nitrate, sodium hydroxide, aluminum nitrate and zircaloy-2 using cathodic stripping voltarnmetry. Tile accuracy of the method was evaluated by means of spike-recovery tests. Results are shown to be accurate with a precision of 10% at the 1 x 10^-6M level. An experimental procedure is also described. The standard addition method is used to determine the chloride concentration in all the samples.