摘要
本文提出的银丝汞膜电极一三电极流动电解池,应用于蓄电池厂废水中微量铅的伏安法测定。在ASD—1型电化学分析仪上,—1200mv.vs,银电极,静止富集5秒,以100mvs^(-1)电位扫速阳极化扫描至0mv,记录导数波,测定微量铅,峰电位在—630mv。废水在采样时以硝酸酸化(PH≈1.5),不另加其它支持电解质,通N_2除氧后测定。测定两个废水样,变异系数分别为1.9%(n=5)和2.2%(n=7);加标回收率为99～103%;最低检出限优于10ng/ml铅。本流通池可用于连续分析水样中微量重金属元素。
A flow cell with a silver wire mercury film electrode(area about 100mm^2) coupled with ASD—1 electroanalyser is used. At—1200mv. vs. silver reference electrode. Static-deposition for 5s. and then scanning till 0 mv. with 100mvs^(-1)rate, recorded the derivative anodic wave, measurement of micro lead in waste water of battery factory. The peak potential is about—630mv. The samples have no need of another supporting electrolyte, only acidfy by concentrated nitric acid (PH≈1.5)at sampling and then determination after deaerated with N_2. For two samples, the variative coeff, 1.9%(n=5), and2.2%(n=7), the recovery 99～103%. the detectability lower than 10 ng/ml. P_6(Ⅱ). The method is simple, fast and suitable for continuous monitoring.
关键词
废水
测定
铅
银丝
汞膜电极
Flow—cell voltammetry, Determination of lead by voltammetry, Silver—wire mercury film electrode, Analysis of waste.
