移取铬酸阳极化溶液5.00 mL置于150 mL烧杯中，加入硝酸（1+1）溶液10 mL，100 g·L^-1抗坏血酸溶液10.0 mL，摇匀，使Cr⁶⁺完全还原为Cr³⁺以消除铬酸的干扰，加水至体积为60 mL，在40~50 r·min^-1的搅拌速率下，以0.010 mol·L^-1硝酸银标准溶液作为滴定剂，采用自动电位滴定法测定溶液中的氯离子。采用该方法分析氯离子质量浓度为0.200，0.500，1.00 g·L^-1的铬酸阳极化溶液以及3批生产线实际样品，测定值的相对标准偏差（n=6）在0.51%~3.0%之间。针对3批生产线实际样品进行加标回收试验，回收率在97.0%~102%之间。

The chromic acid anodizing solution (5.00 mL) was transferred into a beaker of 150 mL, then 10 mL of HNO₃ (1+1) solution, 10.0 mL of 100 g·L^-1 ascorbic acid solution were added. The solution was mixed well to make Cr⁶⁺ completely reduced to Cr³⁺ to eliminate the interference of chromic acid. Water was added to make the volume of the solution up to 60 mL. Cl^- in the solution was determined by automatic potentiometric titration, using 0.010 mol·L^-1 AgNO₃ standard solution as titrant at a stirring rate of 40-50 r·min^-1. The proposed method was applied to analysis of chromic acid anodizing solution containing Cl^- of 0.200, 0.500, 1.00 g·L^-1 and 3 batches of substantial samples from production lines, giving RSDs (n=6) ranged from 0.51% to 3.0%. Recovery tests of 3 batches of substantial samples from production lines were performed by standard addition method, and values of recovery were in the range of 97.0%-102%.