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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。
This paper proposed a mercury silver membrane electrode three-electrode mobile electrolytic cell, used in battery factory wastewater trace lead voltammetric determination. In the ASD-1 electrochemical analyzer, -1200mv.vs, silver electrode, quiescent enrichment of 5 seconds, 100mvs ~ (-1) potential sweep anodic scanning speed to 0mv, recording derivative wave, the determination of trace lead, peak Potential at -630mv. Wastewater samples were nitric acid (PH ≈ 1.5), without additional support electrolyte, measured by deoxidizing N_2. The determination of two wastewater samples showed a coefficient of variation of 1.9% (n = 5) and 2.2% (n = 7), respectively. The spiked recoveries ranged from 99% to 103%. The flow cell can be used for continuous analysis of trace heavy metals in water samples.