在含有氢硫化物离子的溶液（作为试验系统）中确定Eh，对金、铂和硫化物离子选择电极进行比较．这一比较是根据测量精度、响应时间、与pH的关系以及测量重复性等方面做出的．以氢硫化物离子浓度每变化10倍测量Eh，根据Eh的变化，确定每种电极随氢硫化物离子浓度变化的灵敏度。在详细研究发生在金和铂电极表面的电极过程的基础上，提出这些电极在研究的pH范围内响应的是溶液中氢硫化物离子浓度的变化。在比较中已经知道，硫化物离子选择电极响应的则是溶液中硫化物离子活度的变化。尽管，用金和铂电极测得的电位是混合电位，但用预处理方法可得到适合过程控制的信号．为了控制浮选矿浆中氢硫化物离子，建设用在相对于标准氢电极1．0V预处理过的金电极。 Eh was determined in a solution containing hydrosulfide ions as a test system, and gold, platinum and sulfide ion-selective electrodes were compared. This comparison is based on measurement accuracy, response time, pH vs. repeatability, etc. The Eh was measured every 10 times the change in the hydrosulfide ion concentration, and the sensitivity of each electrode to the change in the hydrosulfide ion concentration was determined according to the change of Eh. Based on a detailed study of the electrode processes occurring on the gold and platinum electrode surfaces, it was proposed that these electrodes respond to changes in the concentration of hydrosulfide ions in the solution over the pH range studied. In comparison, it is known that the sulfide ion selective electrode responds to changes in the activity of sulfide ions in the solution. Although the potentials measured with gold and platinum electrodes are mixed potentials, a signal suitable for process control can be obtained using a pretreatment method. To control the hydrosulfide ions in the flotation slurry, a gold electrode preconditioned at 1.0 V relative to a standard hydrogen electrode was constructed.