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测微器式悬汞电极首先由Randles等研制出来,后经Kemula等、Vogel改进后已广泛地应用于电化学及电分析化学的研究中。随着阳极溶出伏安法的发展,此电极的应用日益增多。用悬汞电极测定金属离子的检测下限可达1×10~(-9)M(线性扫描法)和1×10~(-10)M(示差脉冲法),而且在几个数量级的范围内峰电流与去极剂的浓度有线性关系。用悬汞电极的吸附伏安法大大提高了与汞不形成汞齐的金属离子及有机化合物测定的灵敏度,其检测下限可达10~(-9)-10~(-11)M。相对标准偏差小于1％的此类电极国外已有商品出售,国内还未见报导。本文所报导的SH-84型挤压式悬汞电极精度较高,使用方便,装配简单,可屏蔽外界干扰信号,并能长时间连续使用。其性能与端士Metrohm公司生产的EA290型相同。
Micromeritic hanging mercury electrode first developed by Randles et al., After Kemula et al., Vogel improved has been widely used in electrochemical and electroanalytical chemistry research. With the development of anodic stripping voltammetry, the use of this electrode is increasing. The detection limit of metal ions by hanging mercury electrode can reach 1 × 10 -9 M (linear scanning method) and 1 × 10 -10 M (differential pulse method), and in the range of several orders of magnitude The peak current has a linear relationship with the concentration of the depolarizer. Adsorption voltammetry with hanging mercury electrode greatly increased the sensitivity of the determination of metal ions and organic compounds which did not form amalgam with mercury, and the detection limit was 10 ~ (-9) -10 ~ (-11) M. Relative standard deviation of less than 1% of such electrodes have been sold abroad, the domestic has not been reported. SH-84 extruded hanging mercury electrode reported in this paper with high accuracy, easy to use, easy to assemble, can shield the external interference signal, and can be used continuously for a long time. Its performance is the same as the EA290 model produced by Metrohm.