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近年来我们利用功能高分子为活性材料,做成了多种电极,其中用压片法研制的氯离子电极具有内阻小,响应迅速,稳定性好等特点。因此,我们试用压片法制备镨电极,得到了测量线性范围为1×10~(-1)～5×10~(-4)M,斜率为52,内阻小于400kΩ的电极。 1.电极的制备 采用热压成膜法。取含镨(纯度为99.99％)的高分子材料研成粉末,倒入模具内加热软化,加压成膜,冷却后脱模。从制得的大块膜片中取下一小圆块,粘接到电极杆上,加入内充液,插入Ag/AgCl内参比电极就成为镨离子电极。电极第一次使用时,先在氯化镨溶液中活化24h,用后再存放于该溶液中。
In recent years, we use the functional polymer as the active material, made a variety of electrodes, of which the chloride ion electrode developed by the tabletting method with small internal resistance, rapid response, good stability and so on. Therefore, we prepared the praseodymium electrode by the tabletting method and got the electrode with the linear range of 1 × 10 -1 ~ 5 × 10 -4 M, the slope of 52 and the internal resistance of less than 400 kΩ. 1. Preparation of the electrode using hot film forming method. Praseodymium containing (purity of 99.99%) of the polymer material into a powder, into the mold heated to soften, pressure film, after cooling demolding. Remove a small round piece from the prepared large patch, stick to the electrode rod, add the inner filling solution, and insert the reference electrode of Ag / AgCl to become the praseodymium ion electrode. When the electrode is used for the first time, it is activated for 24h first in the praseodymium chloride solution and then stored in the solution after use.