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针对现有Cu/CuSO4参比电极和Zn参比电极无法在低温下保持稳定基准电位,以及受环境污染较大等问题,研制了一套可应用于冻土区的防冻型Cu/CuSO4参比电极。该参比电极在罐体材料及结构、防冻电解液等方面进行了技术创新,具有受外界干扰小、可连续补液、使用寿命长、结构合理、使用方便等优点。在实验室内不同温度下测量X65钢对Zn电极、普通Cu/CuSO4参比电极及防冻型Cu/CuSO4参比电极的电位,结果表明:防冻型Cu/CuSO4参比电极在-20~20℃内电位变化仅为73 mV,基准电位比常用参比电极更稳定。采用能斯特方程对不同温度下的防冻型参比电极的电位差进行计算,计算结果与现场测量值基本吻合。(图4,表1,参10)
Aiming at the problems that existing Cu / CuSO4 reference electrodes and Zn reference electrodes can not maintain stable reference potential at low temperature and are subject to large environmental pollution, a set of antifreeze Cu / CuSO4 reference which can be applied in permafrost regions electrode. The reference electrode in the tank material and structure, antifreeze electrolyte and other aspects of technological innovation, with external interference by small, continuous rehydration, long life, reasonable structure, easy to use and so on. The potentials of X65 steel on Zn electrode, ordinary Cu / CuSO4 reference electrode and antifreezing Cu / CuSO4 reference electrode were measured at different temperatures in the laboratory. The results showed that the antifreezing Cu / CuSO4 reference electrode was stable at -20 ~ 20 ℃ Internal potential changes only 73 mV, the reference potential is more stable than the commonly used reference electrode. The Nernst equation was used to calculate the potential difference of antifreeze reference electrodes at different temperatures. The calculated results are in good agreement with the field measurements. (Figure 4, Table 1, reference 10)