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电位法测定 pH 值时,参比电极一般都采用饱和甘汞电极。由于欲测的某些工业试液中往往有较多的固体颗粒、胶质、悬浮物等存在,会使甘汞电极之毛细孔堵塞,导致电极内电介质溶液的渗液中断,使测定结果不正确。例如:环氧树脂电泳漆的施工,由于 pH 值过高、过低将直接影响到电沉积漆膜性能和电源负载,故需对漆液中 pH 进行控制,经常作测定。由于漆液中存在着胶体,颜料,填充物等,参比电极浸入测定后可明显见到有固体物吸附在毛细孔处,反复使用有堵塞现象,测试数据将不可靠,使用寿命也大为缩短。
Potential method for the determination of pH, the reference electrode are generally saturated calomel electrode. Due to the desire to test some of the industrial test solution often have more solid particles, gums, suspended solids, etc., will clogged pores of calomel electrode, leading to the electrode electrolyte solution exudate interruption, so that the measurement results are not correct. For example: the construction of epoxy resin electrophoretic paint, as the pH value is too high, too low will directly affect the performance of the electrodeposition paint and power load, it is necessary to control the pH of the paint liquid, often for the determination. Due to the presence of colloids, pigments, fillers, etc. in the paint liquid, after the reference electrode is immersed in the test, it is obvious that there is a solid matter adsorbed on the pores, the phenomenon of clogging occurs repeatedly, the test data will be unreliable, and the service life is also large shorten.