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遵照毛主席“独立自主、自力更生”的教导,我们于1963年开始研制了本文所介绍的这种活塞式悬汞电极。这种电极制作比较简单,温度系数较小,悬汞滴面积可在一定范围内随意控制,使用方便,特别是重现性比较好,例如,对5×10~(-7)MCd~(2+)溶液连续测定6次(每测一次换一悬汞滴)的相对偏差不大于1.6％,(见图1)。在我们试验条件下,此电极比Radio-meter E69型悬汞电极重现性好得多。 (一)电极结构活塞式悬汞电极实际上就是一种特制的两路式毛细玻管开关。活塞下端的毛细管(内径可依需要选择,我们选用内径0.5
In accordance with Chairman Mao’s “independent, self-reliance” teaching, we started in 1963 developed this article describes the piston-hung mercury electrode. The electrode is relatively simple to make and the temperature coefficient is relatively small. The area of the hanging mercury drop can be freely controlled within a certain range, and is convenient to use and especially has good reproducibility. For example, for 5 × 10 -7 MCd ~ (2) +) Solution for 6 consecutive measurements (for each test change a drop of mercury droplets) relative deviation of not more than 1.6%, (see Figure 1). This electrode reproduces much better than the Radio-meter E69-type hanging mercury electrode under our experimental conditions. (A) electrode structure Piston hanging mercury electrode is actually a special two-way capillary tube switch. Pistons at the bottom of the capillary (diameter can be selected according to need, we use the inner diameter of 0.5