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用玻璃石墨汞膜电极作指示电极,用较大面积的玻璃石墨片作对极,可与MK—Ⅲ型方波极谱仪联用。注意消除表面活性物质和油污对电极的沾污,按第三次或第四次予电解扫描溶出峯电流计算有良好的再现性;相对误差<±10%。铅的溶出峯电流与铅的浓度、扫描速度、方波电压振幅均呈良好的线性关系。在MK—Ⅲ型方波极谱仪上,在0.2M硝酸钾和2×10~(-6)M硝酸汞溶液中,增益s=1/16,方波电压振幅△E=8毫伏,即能定量测定n×10~(-9)M浓度的铅离子。
Glass graphite mercury electrode as the indicator electrode, with a larger area of glass graphite as the opposite, with MK-Ⅲ type square wave polarography. Care should be taken to eliminate the contamination of the electrode by surface-active substances and oil stains. Good reproducibility is calculated by the third or fourth pre-electrolysis scan for peak elution; the relative error is <± 10%. Lead dissolution peak current and lead concentration, scanning speed, square wave voltage amplitude showed a good linear relationship. In the MK-Ⅲ square wave polarographic instrument, the gain s = 1/16, the square wave voltage amplitude △ E = 8 mV in 0.2M potassium nitrate and 2 × 10-6M mercury nitrate solution, That is, the concentration of lead ions in n × 10 ~ (-9) M can be determined quantitatively.