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本文提出了在石腊处理过的碳棒端面上涂以Hg_2Cl_2-HgS(涂层电极—Ⅰ),和在真空镀膜机上或自制的简易真空系统中蒸镀Hg_2Cl_2-HgS(镀膜电极—Ⅱ)制备高灵敏度电极的方法,并与热压法制得的压片电极(—Ⅲ)进行了比较,表明涂层电极和镀膜电极性能良好。两者准Nernst响应范围3×10~(-6)—10~(-2)MCl~-。压片电极的响应范围是10~(-1)—5×10~(-6)MCl~-。以三种方法制得的电极,都适用于测定高纯水中的微量Cl~-。Ⅰ法简单易行,一般实验室中均可制备应用;Ⅱ法一次制备可得性能非常一致的一批电极;Ⅲ法较麻烦,常温压制难以成
In this paper, Hg_2Cl_2-HgS (Coated Electrode-I) was coated on the surface of paraffin-treated carbon rod and Hg_2Cl_2-HgS (Coated Electrode-Ⅱ) was deposited on a vacuum coater or a homemade vacuum system The method of high-sensitivity electrode was compared with that of hot-pressed electrode (-Ⅲ), which indicated that the performance of coated electrode and coated electrode was good. The quasi - Nernst response range of 3 × 10 -6 -6 -10 MCl ~ -. The response range of the tablet electrode is 10 ~ (-1) -5 × 10 ~ (-6) MCl ~ -. The electrodes prepared by the three methods are suitable for the determination of trace Cl ~ - in high purity water. Ⅰ method is simple and easy, the general laboratory can be prepared for use; Ⅱ method can be prepared with a very consistent performance of a number of electrodes; Ⅲ method is more troublesome, difficult to suppress the room temperature into