Electrochemical reactions of pyrite in acid perchlorate solutions
Electrochemical reactions of pyrite in acid perchlorate solutions
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DOI：
10.1179/cmq.1968.7.3.111
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发表时间：
1968-07
影响因子：
0.9
通讯作者：
E. Peters;H. Majima
中科院分区：
文献类型：
--
作者：
E. Peters;H. Majima
黄铁矿在1 M HClO 4中进行电化学测量，以确定阳极和阴极电极反应。在阳极条件下，仅形成铁离子和硫酸根离子，而在阴极条件下，亚铁离子和H2S与氢气一起排出。如果有氧存在，氧的还原将引起阴极电流的额外增加。普通黄铁矿，暴露于空气中，显示出约+0.62伏的静止电势（相对于SHE），它比任何其他硫化物矿物都更贵。当土壤[~]用氦气流血的，导致静止电位在0.2和0.3伏之间，与化学估计的黄铁矿的可逆电位更一致。因此，0.62伏值被视为“被动”状态的证据。因此，在0.3和0.6伏之间，被动黄铁矿是阴极的，而“活性”黄铁矿是阳极的。
AbstractPyrite has been subjected to electrochemical measurements in 1M HClO4 to determine anodic and cathodic electrode reactions. Under anodic conditions only ferric and sulphate ions are formed, while under cathodic conditions ferrous ions and H2S are discharged, with hydrogen. If oxygen is present, its reduction will cause an additional increment of cathodic current.Ordinary pyrite, exposed to air, exhibits a rest potential of about +0.62 volt (vs. SHE) which is more noble than for any other sulphide mineral. Cathodic excursions that generate H2S and leave a clean pyrite surface when the soIi[~on is bub bled with helium lead to rest potentials of between 0.2 and 0.3 volt, much more consistent with the thermodynamically estimated reversible potential of pyrite. The 0.62-volt value is therefore regarded as evidence of a ‘passive’ condition. Thus, between 0.3 and 0.6 volt, passive pyrite is cathodic, while ‘active’ pyrite is anodic Resume On a fait des mesures electrochimiques sur la pyrite dans HClO4 1M...