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海水中氯(即氯离子)含量较高,用氯离子选择电极直接电位法测定误差较大,而且固态氯离子选择电极在海水中使用,产生长时间的漂移,造成了操作的困难。采用氯化银涂丝电极电位滴定法,虽有明显的电位突跃,但需要在丙酮介质中进行滴定。本文以硫化银电极作为指示电极,第二种离子选择电极为参比电极,组成无液体接界测量系统,对海水中高含量氯的测定进行了研究。试验表明,以氟离子选择电极或玻璃电极作参比电极,在酸性溶液中,电位突跃约140毫伏,终点明显,尤其是氟离子选择电极作参比电极,电位较稳定。实现了在酸性溶液中,不加有机试剂直接测定海水中高含量
Chlorine (ie, chloride) content in seawater is relatively high, with chloride ion selective electrode direct potential method to determine the error, and the solid chloride ion selective electrode used in seawater, resulting in a long time drift, resulting in operational difficulties. Silver chloride coated wire potentiometric titration, although significant potential jumps, but the need for titration in acetone medium. In this paper, the silver sulfide electrode as the indicator electrode, the second ion-selective electrode as the reference electrode, the composition of a liquid junction measurement system, the determination of high concentrations of chlorine in seawater were studied. Experiments show that fluoride ion selective electrode or glass electrode as a reference electrode in acid solution, the potential jump of about 140 mV, the end point is obvious, especially the fluoride ion selective electrode as a reference electrode, the potential is more stable. Achieved in acidic solution, without organic reagents directly measure the high content of seawater