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文献报道了在聚乙二醇存在下,以离子选择性电极为指示电极,用四苯硼酸钠电位滴定测定铅的方法,随后又用该法测定钢铁中的铅。我们将此法应用于铅矿中高含量铅的直接滴定。试验部份一仪器与试剂氟硼酸根PVC膜电极(按文献自制) 217型甘汞电极(盐桥套管用饱和硝酸钠充注)(上海电光仪器厂) 2ml微量滴定管(长沙玻璃仪器厂) 银丝电极四苯硼酸钠(NaTPB)标准溶液:按文献配制及保存。铅标准溶液:称取0.2500g高纯铅粒溶于15mlHNO_3(1+1)中,转入250ml量瓶中稀释至刻度。每毫升含铅0.1000g。
Reported in the literature in the presence of polyethylene glycol, the ion-selective electrode as the indicator electrode, with sodium tetraphenylborate potentiometric titration method for the determination of lead, followed by this method for the determination of lead in steel. We apply this method to direct titration of high lead in lead ore. Experimental part of an instrument and reagents fluoroborate PVC membrane electrode (according to the literature) 217 calomel electrode (saline bridge casing filled with saturated sodium nitrate) (Shanghai Electric Instrument Factory) 2ml microtiter (Changsha Glass Instrument Factory) silver Wire electrode Sodium tetrabenzene (NaTPB) standard solution: prepared and stored according to the literature. Lead standard solution: Weigh 0.2500g high purity lead particles dissolved in 15mlHNO_3 (1 + 1), into a 250ml flask diluted to the mark. 0.1000g per milliliter of lead.