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在石蜡处理过的碳棒端面涂上或真空蒸镀Hg_2Cl_2-HgS以制备高灵敏度氯离子电极,与热压法制得的压片电极比较表明,涂层或镀膜电极性能良好,两者准Nernst响应为3×10~(-6)～10~(-2)M Cl~-。涂层简单易行,便于再生和推广。镀膜一次可制得性能一致的一批电极。压片法较麻烦,常温压制难以成功,需高温长时间,但电极寿命较长。拟定了以此类电极测定高纯水中微量氯离子的方法。标准比较或标准加入—已知稀释法的结果与比色法一致。
Hg_2Cl_2-HgS was prepared by vacuum deposition of Hg_2Cl_2-HgS on the paraffin-treated carbon rod end surface and compared with the hot pressed pressure electrode. The results show that the coating or coated electrode has good performance. The quasi-Nernst response Is 3 × 10 -6 (-6) ~ 10 ~ (-2) M Cl ~ -. Coating is simple and easy to reproduce and promote. Coating time can be obtained consistent performance of a number of electrodes. Compression method is more troublesome, difficult to suppress at room temperature, high temperature for a long time, but the electrode life is longer. A method for determination of trace chloride ions in high purity water by using these electrodes was developed. Standard comparison or standard addition - The result of the known dilution is consistent with the colorimetric method.