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用氟离子选择电极作指示电极,测定铬镀液中微量氟化物(0.5克/升左右),大量CrO_3及杂质Fe、Cu、Cl~-等不干扰,操作较容量法快速,准确度实用于生产控制。 (一)实验仪器与试剂 1.pHS-1型酸度计(与KD-1型量程扩大器组合使用)。 2.离子强度缓冲溶液:NaAc·
Fluoride ion selective electrode was used as the indicator electrode to measure the trace fluoride (0.5 g / L) in the chromium plating solution. A large amount of CrO 3 and impurities such as Fe, Cu and Cl ~ were not disturbed. The volumetric method was rapid and accurate. Production control. (A) of the experimental apparatus and reagents 1.pHS-1-type pH meter (with the KD-1 type range expansion device used in combination). 2. Ionic strength buffer solution: NaAc ·