Abstract：The potential was not stable in determination of chloride ion by potentiometric titration. To solve this problem, a determination method of chloride ion content in copper electrolyte was established by automatic potentiometric titration with small dose isopropanol as stabilizer. The experimental method was described as follows: 10.00 mL of copper electrolyte sample was accurately transferred into 50 mL beaker; the reaction temperature was controlled at 20-30°C; after adding 2 mL of isopropanol, the solution was diluted with water to about 50 mL;after the silver combination electrode and dropper were washed with water and then inserted into testing solution, the rotate speed of stirrer was control at 625 r/min; finally, the solution was titrated with 0.010 0 moL/L silver nitrate standard solution. The interference test indicated that the influence of sulfuric acid, copper matrix and other coexisting elements in copper electrolyte sample on the determination of chloride ion could be ignored. The proposed method was applied to the determination of chloride ion in copper electrolyte actual sample. The results were basically consistent with those obtained by turbidimetry. The relative standard deviation (RSD, n=5) was less than 0.74%. The recoveries were between 98% and 102%.
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