Hahn C E, Davis A H, Albery W J
Respir Physiol. 1975 Oct;25(1):109-33. doi: 10.1016/0034-5687(75)90055-9.
Rotating ring-disc electrode studies have indicated that relatively large quantities of hydrogen peroxide ion, HO2-, are produced when oxygen is reduced at a platinum or gold polarographic electrode surface. The electrochemical reduction processes are improved and the quantity of HO2- is reduced by using alkaline buffer electrolytes (pH 10 to 11) and by polarising the electrode at voltages more negative than -0.9 V. The presence of HO2- in the electrolyte has been shown to be the cause of excessively long time response in both blood-gas and respiratory polarographic PO2 electrodes; electrode alinearity on micro-blood-gas PO2 electrodes has also been shown to be due to the absence of a plateau on the polarogram of electrodes when used with conventional electrolytes. The use of a high pH buffer and high negative voltage results in a long, flat plateau and a marked improvement in both electrode linearity and response time. This two-fold improvement in electrode performance holds true for both platinum and gold polarographic respiratory gas and blood-gas PO2 electrodes.
旋转环盘电极研究表明，当氧气在铂或金极谱电极表面被还原时，会产生相对大量的过氧化氢离子HO₂⁻。通过使用碱性缓冲电解质（pH值为10至11）以及将电极极化到比-0.9V更负的电压，可以改善电化学还原过程并减少HO₂⁻的量。电解质中HO₂⁻的存在已被证明是血气和呼吸极谱PO₂电极响应时间过长的原因；微血气PO₂电极上的电极线性也已表明是由于与传统电解质一起使用时电极极谱图上没有平台。使用高pH缓冲液和高负电压会导致出现长而平坦的平台，并且电极线性和响应时间都有显著改善。对于铂和金极谱呼吸气体和血气PO₂电极，电极性能的这两方面改善都是成立的。
