Centre de Pédologie Biologique du C.N.R.S., UPR 6831 Associée à l'Université de Nancy I, 17 Rue Notre-Dame-des-Pauvres, B. P. 5, and Ecole Nationale Supérieure de Géologie, Laboratoire "Environnement et Minéralurgie," U. R. A. 235 du C.N.R.S., B. P. 40, 54501 Vandoiuvre-les-Nancy Cedex, France.
Appl Environ Microbiol. 1992 Apr;58(4):1175-82. doi: 10.1128/aem.58.4.1175-1182.1992.
The oxidation of a pure pyrite by Thiobacillus ferrooxidans is not really a constant phenomenon; it must be considered to be more like a succession of different steps which need characterization. Electrochemical studies using a combination of a platinum electrode and a specific pyrite electrode (packed-ground-pyrite electrode) revealed four steps in the bioleaching process. Each step can be identified by the electrochemical behavior (redox potentials) of pyrite, which in turn can be related to chemical (leachate content), bacterial (growth), and physical (corrosion patterns) parameters of the leaching process. A comparison of the oxidation rates of iron and sulfur indicated the nonstoichiometric bacterial oxidation of a pure pyrite in which superficial phenomena, aqueous oxidation, and deep crystal dissolution are successively involved.
由氧化亚铁硫杆菌引起的纯净黄铁矿的氧化并不是一个恒常的现象；它更应该被视为一系列不同的步骤，这些步骤需要被描述。使用铂电极和特定黄铁矿电极（填充-研磨黄铁矿电极）的电化学研究揭示了生物浸出过程中的四个步骤。每个步骤都可以通过黄铁矿的电化学行为（氧化还原电位）来识别，这又可以与浸出过程的化学（浸出液含量）、细菌（生长）和物理（腐蚀模式）参数相关联。对铁和硫的氧化速率的比较表明，纯黄铁矿的细菌非化学计量氧化涉及表面现象、水相氧化和深部晶体溶解的相继发生。
