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锰-锌干电池电液中存在的氢过电位低而还原电位较锌正的杂质元素(Ni、Fe、Pb、Cu、Co等)会使电池产生自放电而引起锌负极的腐蚀与能量的无谓消耗,从而影响电池的贮存寿命及使用寿命。电池电液的净化工作(除去杂质元素)是电池生产过程中的一个重要环节,其质量标准主要在于确定上述杂质元素在电液中的含量。本文提出微分脉冲极谱法直接测定干电池电液中痕量铅。电液中存在的Zn~(2+),其还原电位较Pb~(2+)负得多,不会干扰测定,且可作为支持电解质。在此介质中,Pb~(2+)还原的峰电位为-0.45V(对Ag-AgCl电极,试验值),峰形良好,便于测量。可采用标准加入法
The existence of hydrogen overpotential in the manganese-zinc battery electrolyte is low and the reduction potential is more than zinc positive impurity elements (Ni, Fe, Pb, Cu, Co, etc.) will make the battery produce self-discharge and cause the corrosion and energy of the zinc anode Consumption, thus affecting the battery storage life and service life. Battery electro-hydraulic purification work (to remove impurity elements) is an important part of the battery production process, the quality standard is mainly to determine the impurity elements in the electro-hydraulic content. In this paper, differential pulse polarography is proposed for direct determination of trace lead in dry cell electro-hydraulic. The Zn 2+ existing in the electro-hydraulic solution has a much lower reduction potential than Pb 2+, does not interfere with the determination, and serves as a supporting electrolyte. In this medium, the peak potential of Pb ~ (2+) reduction is -0.45V (for Ag-AgCl electrode, the test value), the peak shape is good, easy to measure. Can use the standard join method