微分脉中极谱法测定EMD中,电解液MnSO_4—H_2SO_4中微量Pb及Pb—Ag—Ca阳极的消耗量

Determination of truce Element Pb in the EMD and in the Electrolyte MnSO_4—H_2SO_4 and consuming Quantity for Pb—Ag—Ca Anode by Differential Pulse Polarography

在EMD(电解MnO_2)中及电解液MnSO_4—H_2SO_4中的微量Pb已用微分脉冲极谱法(D.P.P)测定,此微量Pb来源于在制备EMD过程中,新型Pb—Ag—Ca合金阳极(简称PAC阳极)的极微溶解。将KCL(aq.)分别加入用KCL(aq.)溶解EMD所得的Mnle_2(aq.)中及电解液MnSO_4—H_2SO_4中,作为底液,分别测定其D.P.P.图,峰形良好,Pb(Ⅱ)在前者及后者溶液中其峰电位分别为0.56V及-0.44V(v.s.Ag—Agcl)电位Pb(Ⅱ)含量可用标准加入法精确定量,此法简便、可靠、快速。此研究为PAC阳极用于EMD工业提供基础数据,并衡算得PAC阳极年消耗量为6.025%。

The determination of trace element Pb in EMD and in electrolyte M_nSO_4—H_2SO_4 was studied with differential pulse polaragraphy. The trace Pb was originated from new type Pb—Ag—Ca alloy anode being used in production process of electrolytic M_nSO_1(EMD) the Kcl was added as background of electrolyte The differeutial pulse polar—ography obtained for Pb(Ⅱ) is well in peak contour and is easy to determination The peak potential is—0.56V(v. s. Ag—AgCl potential,experimential value) Pb(Ⅱ)in EMD; and is—0.44V Pb(Ⅱ) in electrolytic M_nSO_4—H_2SO_4 respectively, the Pb content may be determined by standard addition method which is simple reliable and fast,This study presents some foundamental data for Pb—Ag—Ca anode(abbrevited to PAC anode) The cosuming guantity for PAC anode is evaluated as 6.025% annually.